Multi-reflection chambers and method for determining formation of a matrix-shaped light spot in multi-reflection chambers

Abstract

The present invention discloses a multi-reflection chamber and a method for determining the formation of a matrix-shaped light spot in the multi-reflection chamber. The multi-reflection chamber includes a first mirror surface and a second mirror surface that are symmetrically arranged, wherein: the first mirror surface and the second mirror surface respectively include a predetermined number of non-overlapping rectangular concave mirrors; an incident hole is provided on the first mirror surface or the second mirror surface, and the light incident through the incident hole is adapted to be reflected multiple times between the first mirror surface and the second mirror surface and then emitted, and is adapted to form mutually symmetric matrix-shaped light spots on the first mirror surface and the second mirror surface. According to the technical solution of the present invention, by forming a matrix-shaped light spot pattern, the mirror surface area of the multi-reflection chamber can be fully utilized, the optical path volume ratio is relatively high, and the distance between the two side mirror surfaces is relatively large, so as to facilitate achieving a larger optical path with fewer reflection times.

Description

Technical Field

[0001] The present invention relates to the technical field of trace gas monitoring, and particularly to a multi-reflection gas chamber and a method for determining a matrix-shaped light spot formed in the multi-reflection gas chamber. Background Art

[0002] The high-precision real-time online measurement technology of trace gases has extremely wide application prospects in the fields of environmental pollution monitoring, atmospheric chemistry, ecological protection, etc. In recent years, the cavity ring-down spectroscopy technology (CRDS) and the off-axis integrated cavity output spectroscopy technology (OA-ICOS) developed as important trace gas spectroscopy measurement methods have the advantages of high sensitivity, high time resolution, etc. However, due to the need to use optical mirrors with extremely high reflectivity in this technology, it has the disadvantages of high cost, great difficulty in technical implementation, poor environmental robustness, etc.

[0003] The tunable diode laser absorption spectroscopy technology (TDLAS) has the advantages of high precision, high responsiveness, high selectivity, and good environmental adaptability, and has been successfully applied to many industries and fields such as environmental monitoring, industrial process control, petrochemical industry, etc. The multi-reflection gas chamber is the key core device for effectively improving the optical path of the TDLAS technology. The TDLAS technology combined with the long optical path multi-reflection gas chamber is expected to overcome the disadvantages of the CRDS and OA-ICOS technologies and become an important means for low-cost and high-precision trace gas monitoring.

[0004] The ideal long optical path multi-reflection gas chamber suitable for multi-component monitoring of trace gases should have the following characteristics: 1. The optical path is long, up to hundreds of meters or more; 2. The light spot distribution has obvious regularity, is easy to distinguish, and the utilization rate of the reflecting mirror surface is high; 3. It has good optical performance and good beam quality; 4. The cost is low, the optical path adjustment is simple, and it has high reliability, high stability and good environmental adaptability; 5. It can realize simultaneous measurement of multiple components, and the optical path is adjustable. Therefore, the design and optimization of a high-performance, long optical path multi-reflection gas chamber is a major challenge for realizing low-cost and high-precision real-time monitoring of trace gases.

[0005] The design of multiple reflection air cells is one of the research hotspots of TDLAS technology. A type of multiple reflection air cell currently being studied is based on the classic Herriott-type air cell, which is composed of two spherical mirrors with the same radius of curvature placed coaxially and symmetrically. The light spot distribution is elliptical or circular, and the light spot is dispersed on the edge of the mirror surface as a whole. The mirror utilization rate is low and the air cell optical path volume ratio is very small. In order to overcome the above shortcomings, some researchers use complex curved mirrors instead of spherical mirrors to form Lissajous figures, which increases the mirror utilization rate and optical path volume ratio. However, there are shortcomings such as high manufacturing cost of astigmatism mirrors, poor regularity of light spots, and difficulty in determining the optical path. In addition, some researchers have designed dense light spot patterns such as concentric circles and independent circles based on the Herriott-type spherical mirror. Although the mirror utilization rate of this type of multiple reflection air chamber is improved, the light spot distribution is uneven and is located on the periphery of the spherical mirror, which often does not meet the paraxial approximation assumption. The design process requires simulation and analysis of the light spot deformation, which is a cumbersome process. Moreover, the distance between the two spherical mirrors is small, and the commonly designed optical path is within tens of meters. It is only suitable for the production of miniaturized portable air chamber devices, and it is difficult to achieve a long optical path of more than hundreds of meters.

[0006] Therefore, a multi-reflector air chamber and a method for determining the formation of a matrix-type light spot in the multi-reflector air chamber are needed to solve the problems existing in the above technical solutions. Summary of the invention

[0007] To this end, the present invention provides a multi-reflector air chamber and a method for determining the formation of a matrix-type light spot in the multi-reflector air chamber to solve or at least alleviate the above problems.

[0008] According to one aspect of the present invention, there is provided a multi-reflective air chamber, comprising a first mirror and a second mirror arranged symmetrically, wherein: the first mirror and the second mirror respectively comprise a predetermined number of non-overlapping rectangular concave mirrors; an incident hole is provided on the first mirror or the second mirror, and light incident through the incident hole is suitable for being emitted after multiple reflections between the first mirror and the second mirror, and is suitable for forming mutually symmetrical matrix-type light spots on the first mirror and the second mirror.

[0009] Optionally, in the multi-reflector air chamber according to the present invention, the predetermined number is 3; the first mirror surface includes a first rectangular concave mirror, a second rectangular concave mirror, and a third rectangular concave mirror spliced ​​together, wherein the first curvature center (C 1 ) and the third curvature center of the third concave mirror (C 3 ) are colinear; the second mirror surface includes: a fourth rectangular concave mirror, which has the same mirror parameters as the first rectangular concave mirror and is symmetrically arranged; a fifth rectangular concave mirror, which has the same mirror parameters as the second rectangular concave mirror and is symmetrically arranged; a sixth rectangular concave mirror, which has the same mirror parameters as the third rectangular concave mirror and is symmetrically arranged.

[0010] Optionally, in the multi-reflection air chamber according to the present invention, the first curvature center (C 1 ) and the third curvature center (C 3 ) are located on a straight line in the first direction; the first-direction spacing of the matrix-shaped light spot is twice the first-direction distance between the first curvature center (C 1 ) and the third curvature center (C 3 ); the second-direction spacing of the matrix-shaped light spot is twice the second-direction distance between the second curvature center (C 2 ) and the first curvature center (C 1 ); wherein, the first direction is the vertical direction or the horizontal direction, and the second direction is perpendicular to the first direction.

[0011] Optionally, in the multi-reflection air chamber according to the present invention, when the first direction is the vertical direction, the second-direction distance between the second curvature center (C 2 ) and the first curvature center (C 1 ) is: Wherein, L represents the second-direction distance between the second curvature center (C 2 ) and the first curvature center (C 1 ), m represents the number of rows of the matrix-shaped light spot, d l represents the first-direction spacing of the matrix-shaped light spot; when the first direction is the horizontal direction, the second-direction distance between the second curvature center (C 2 ) and the first curvature center (C 1 ) is: Wherein, L represents the second-direction distance between the second curvature center (C 2 ) and the first curvature center (C 1 ), n represents the number of columns of the matrix-shaped light spot, d c represents the first-direction spacing of the matrix-shaped light spot.

[0012] Optionally, in the multi-reflection air chamber according to the present invention, wherein, the first rectangular concave mirror, the second rectangular concave mirror, and the third rectangular concave mirror are spliced in sequence; the height of the first rectangular concave mirror is equal to the sum of the heights of the second rectangular concave mirror and the third rectangular concave mirror, and the lengths of the first rectangular concave mirror, the second rectangular concave mirror, and the third rectangular concave mirror are the same; the first curvature center (C 1 ) and the third curvature center (C 3 ) are located on a straight line in the vertical direction.

[0013] Optionally, in the multi-reflection gas chamber according to the present invention, the first rectangular concave mirror is respectively spliced with the second rectangular concave mirror and the third rectangular concave mirror; the length of the first rectangular concave mirror is equal to the sum of the lengths of the second rectangular concave mirror and the third rectangular concave mirror, and the heights of the first rectangular concave mirror, the second rectangular concave mirror, and the third rectangular concave mirror are the same; the first curvature center (C 1 ) and the third curvature center (C 3 ) are located on a straight line in the horizontal direction.

[0014] Optionally, in the multi-reflection gas chamber according to the present invention, the matrix-shaped light spot includes a plurality of light spots arranged in m rows and n columns; wherein, m≥4, and m is an even number, and n is a positive integer.

[0015] Optionally, in the multi-reflection gas chamber according to the present invention, the matrix-shaped light spot includes a plurality of light spots arranged in m rows and n columns; wherein, m≥2, and m is an even number, and n is a positive integer.

[0016] Optionally, in the multi-reflection gas chamber according to the present invention, the incident hole is provided on the second rectangular concave mirror or the fifth rectangular concave mirror.

[0017] Optionally, in the multi-reflection gas chamber according to the present invention, a plurality of incident holes are provided on the second rectangular concave mirror and / or the fifth rectangular concave mirror; the multi-reflection gas chamber is adapted to inject multiple laser beams, and each laser beam is respectively adapted to detect a gas; wherein, the multiple laser beams are adapted to enter through the multiple incident holes and be reflected multiple times between the first mirror surface and the second mirror surface and then exit, and are adapted to form multiple groups of non-overlapping matrix-shaped light spots on the first mirror surface and the second mirror surface.

[0018] Optionally, in the multi-reflection gas chamber according to the present invention, the predetermined number is 4; the first mirror surface includes the first rectangular concave mirror, the second rectangular concave mirror, the third rectangular concave mirror, and the fourth rectangular concave mirror that are spliced with each other. Among them, the second curvature center of the second rectangular concave mirror and the fourth curvature center of the fourth concave mirror are collinear in the vertical direction, and the first curvature center of the first rectangular concave mirror and the fourth curvature center of the fourth concave mirror are collinear in the horizontal direction; the second mirror surface includes: a fifth rectangular concave mirror, which has the same mirror surface parameters as the first rectangular concave mirror and is symmetrically arranged; a sixth rectangular concave mirror, which has the same mirror surface parameters as the second rectangular concave mirror and is symmetrically arranged; a seventh rectangular concave mirror, which has the same mirror surface parameters as the third rectangular concave mirror and is symmetrically arranged; an eighth rectangular concave mirror, which has the same mirror surface parameters as the fourth rectangular concave mirror and is symmetrically arranged.

[0019] Optionally, in the multi-reflection gas chamber according to the present invention, the rectangular concave mirror is a rectangular concave spherical mirror, and the radius of curvature of each rectangular concave mirror is the same, and the radius of curvature is equal to the distance between the first mirror surface and the second mirror surface.

[0020] Optionally, in the multi-anti-gas chamber according to the present invention, the mirror parameters of the first mirror and the second mirror are adapted to be determined by using a genetic algorithm; wherein, the mirror parameters include the curvature center positions and sizes of each rectangular concave mirror included in the first mirror and the second mirror.

[0021] Optionally, in the multi-anti-gas chamber according to the present invention, the mirror parameters of the first mirror and the second mirror are adapted to be determined according to the following steps: randomly generate a plurality of matrix-shaped light spot formation order individuals as an initial population; perform one or more iterations based on the initial population to obtain one or more generations of populations; calculate the number of curvature centers corresponding to each matrix-shaped light spot formation order individual in each generation of population to determine the target matrix-shaped light spot formation order corresponding to the number of curvature centers being a predetermined number; based on the target matrix-shaped light spot formation order, determine the mirror parameters of the first mirror and the second mirror.

[0022] Optionally, in the multi-anti-gas chamber according to the present invention, the mirror parameters of the first mirror and the second mirror are further adapted to be determined according to the following steps: take the target matrix-shaped light spot formation order as the matrix-shaped light spot formation order of the second mirror, and take the reversed target matrix-shaped light spot formation order as the matrix-shaped light spot formation order of the first mirror; based on the matrix-shaped light spot formation orders of the first mirror and the second mirror, determine whether the first mirror and the second mirror can be respectively divided into a predetermined number of non-overlapping rectangular concave mirrors; if so, determine the mirror parameters and sizes of each rectangular concave mirror included in the first mirror and the second mirror.

[0023] Optionally, in the multi-anti-gas chamber according to the present invention, determining whether the first mirror and the second mirror can be respectively divided into a predetermined number of non-overlapping rectangular concave mirrors includes: based on the matrix-shaped light spot formation orders of the first mirror and the second mirror, determine the mirror positions where each light spot in the matrix-shaped light spot is located; based on the mirror positions where each light spot is located, determine whether the first mirror and the second mirror can be respectively divided into a predetermined number of non-overlapping rectangular concave mirrors.

[0024] Optionally, in the multi-anti-gas chamber according to the present invention, the value range of the predetermined number K is K≥3, and K is a positive integer.

[0025] Optionally, in the multi-reflection air chamber according to the present invention, the number of curvature centers corresponding to each individual of the matrix spot formation order in each generation of the population is calculated to determine the target matrix spot formation order corresponding to the number of curvature centers being a predetermined number, including: calculating the number of curvature centers corresponding to each individual in each generation of the population, and determining whether the number of curvature centers is the predetermined number; if the number of curvature centers is the predetermined number, determining the matrix spot formation order corresponding to the individual corresponding to the absolute value of the difference as the target matrix spot formation order; if the number of curvature centers is not the predetermined number, then: performing crossover and mutation operations on the population to obtain the next generation of the population; calculating the number of curvature centers corresponding to each individual in the next generation of the population, and determining whether the number of curvature centers is the predetermined number; until it is determined that the number of curvature centers is the predetermined number, determining the matrix spot formation order corresponding to the individual with the number of curvature centers being the predetermined number as the target matrix spot formation order.

[0026] According to one aspect of the present invention, there is provided a method for determining the formation of a matrix spot in a multi-reflection air chamber, which is executed in a computing device, and the multi-reflection air chamber is as described above. The method includes the steps of: establishing an optical model of the multi-reflection air chamber based on the mirror surface parameters of the first mirror surface and the second mirror surface of the multi-reflection air chamber; based on a first predetermined distance interval, constructing an array of the first-direction distances of the first curvature center (C 1 ) of the first rectangular concave mirror and the third curvature center (C 3 ) of the third rectangular concave mirror; based on a second predetermined distance interval, constructing an array of the second-direction distances of the second curvature center (C 2 ) of the second rectangular concave mirror and the first curvature center (C 1 ) of the first rectangular concave mirror; for each first-direction distance value in the array of the first-direction distances of the curvature centers and each second-direction distance in the array of the second-direction distances of the curvature centers, setting the light to be incident from a predetermined incident point, and determining the matrix spot formed by the light on the first mirror surface and the second mirror surface according to the optical model; selecting the matrix spots whose number of rows is within a predetermined range of the number of rows and whose number of columns is within a predetermined range of the number of columns as candidate matrix spots, and generating a candidate matrix spot set based on all the candidate matrix spots; and determining the optical path corresponding to each candidate matrix spot according to the optical model, so as to select the candidate matrix spot that meets the fixed optical path condition as the optimal matrix spot.

[0027] Optionally, in the method for determining the formation of a matrix spot in a multi-reflection air chamber according to the present invention, the step of setting the light to be incident from a predetermined incident point includes: constructing an array of incident angles based on a predetermined angle interval; setting the light to be incident from the predetermined incident point at each incident angle in the array of incident angles respectively.

[0028] Optionally, in the method for determining the formation of a matrix-shaped light spot in a multi-reflection chamber according to the present invention, the predetermined incident point is located on the second rectangular concave mirror or the fifth rectangular concave mirror; the step of setting the light to be incident from the predetermined incident point includes: constructing an array of predetermined incident point coordinates based on twice the second predetermined distance interval; and setting the light to be incident from the predetermined incident point based on each predetermined incident point coordinate in the array of predetermined incident point coordinates.

[0029] Optionally, in the method for determining the formation of a matrix-shaped light spot in a multi-reflection chamber according to the present invention, the first predetermined distance interval is D 1 / 2, and the second predetermined distance interval is D 2 / 2, where D 1 represents the first-direction pitch of the matrix-shaped light spot, and D 2 represents the second-direction pitch of the matrix-shaped light spot.

[0030] According to one aspect of the present invention, there is provided a computing device, including: at least one processor; and a memory storing program instructions, wherein the program instructions are configured to be executed by the at least one processor, and the program instructions include instructions for executing the method as described above.

[0031] According to one aspect of the present invention, there is provided a readable storage medium storing program instructions, which, when read and executed by a computing device, cause the computing device to execute the method as described above.

[0032] According to the multi-reflection chamber and the method for determining the formation of a matrix-shaped light spot in a multi-reflection chamber according to the present invention, a genetic algorithm is used to determine the structure of the multi-reflection chamber suitable for forming a matrix-shaped light spot. Among them, according to the multi-reflection chamber proposed by the present invention, the mirror surfaces on both sides are symmetrically arranged, and each mirror surface on each side includes three mutually spliced rectangular concave mirrors. After the light is incident on the multi-reflection chamber, mutually symmetric matrix-shaped light spots can be formed on the mirror surfaces on both sides. By forming a matrix-shaped light spot pattern, the mirror surface area of the multi-reflection chamber can be fully utilized, the optical path volume ratio is relatively high, and the distance between the mirror surfaces on both sides is relatively large, which is beneficial to achieving a large optical path with fewer reflection times. In addition, according to the method for determining the formation of a matrix-shaped light spot in a multi-reflection chamber according to the present invention, various matrix-shaped light spot patterns that can be formed in the multi-reflection chamber can be determined. In this way, the optimal matrix-shaped light spot pattern can be selected according to the actual optical path conditions required in practical applications.

[0033] In addition, according to the multi-reflection chamber of the present invention, by making multiple laser beams incident on the multi-reflection chamber and forming multiple groups of non-overlapping matrix-shaped light spots, each laser beam is respectively used to detect a gas. In this way, synchronous detection of multiple gases can be realized in the multi-reflection chamber, improving the utilization rate of the multi-reflection chamber and the detection efficiency of the gas.

[0034] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented in accordance with the content of the specification. And in order to make the above and other objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are hereinafter specifically exemplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] To achieve the above and related purposes, certain illustrative aspects are described herein in conjunction with the following description and the accompanying drawings, which indicate various ways in which the principles disclosed herein can be practiced, and all aspects and their equivalent aspects are intended to fall within the scope of the claimed subject matter. By reading the following detailed description in conjunction with the accompanying drawings, the above and other objects, features and advantages of the present disclosure will become more apparent. Throughout the present disclosure, the same reference numerals generally refer to the same components or elements.

[0036] Figure 1 FIG. 100 shows a structural block diagram of a computing device 100 according to an embodiment of the present invention;

[0037] Figure 2 FIG. 200 shows a schematic diagram of a method 200 for determining multi-reflection chamber mirror parameters according to an embodiment of the present invention;

[0038] Figure 3 FIG. 18 shows a schematic diagram of two target matrix spot formation sequences corresponding to two optimal solutions determined according to method 200;

[0039] Figure 4 FIG. 400 shows a schematic structural diagram of a multi-reflection chamber 400 according to a first embodiment of the present invention;

[0040] Figure 5 FIG. 26 shows a schematic diagram of forming a matrix spot on both side mirrors of a multi-reflection chamber 400 according to a first embodiment of the present invention;

[0041] Figure 6 FIG. 400 shows a schematic structural diagram of a multi-reflection chamber 400 according to a second embodiment of the present invention;

[0042] Figure 7 FIG. 34 shows a schematic diagram of forming a matrix spot on both side mirrors of a multi-reflection chamber 400 according to a second embodiment of the present invention.

[0043] Figure 8 FIG. 800 shows a flowchart of a method 800 for determining to form a matrix spot in a multi-reflection chamber according to an embodiment of the present invention;

[0044] Figure 9 FIG. 42 shows a schematic diagram of various matrix spot patterns formed on the second mirror of a multi-reflection chamber according to a first embodiment of the present invention;

[0045] Figure 10 A schematic diagram showing various matrix - type light spot patterns formed on a second mirror surface by a multi - reflection gas chamber according to a second embodiment of the present invention;

[0046] Figure 11 A schematic diagram showing two groups of matrix - type light spots respectively formed on two side mirror surfaces by a multi - reflection gas chamber according to a first embodiment of the present invention. Detailed implementation manners

[0047] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that this solution can be understood more thoroughly and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0048] According to the technical solution of the present invention, a genetic algorithm is used to determine the structure of a multi - reflection gas chamber (multiple - reflection gas chamber) suitable for forming matrix - type light spots. Among them, according to the multi - reflection gas chamber proposed by the present invention, the two side mirror surfaces are symmetrically arranged, and each side mirror surface respectively includes three mutually spliced rectangular concave mirrors. After light enters the multi - reflection gas chamber, mutually symmetric matrix - type light spots can be formed on the two side mirror surfaces. This kind of multi - reflection gas chamber makes full use of the mirror surface area, has a relatively high optical path volume, and the distance between the two side mirror surfaces is relatively large, which is conducive to achieving a large optical path with fewer reflection times. In addition, in the method for determining the matrix - type light spots formed in the multi - reflection gas chamber of the present invention, an extended analysis is carried out on the types of matrix - type light spot patterns that can be formed by the multi - reflection gas chamber of the present invention, so as to select the optimal matrix - type light spot pattern according to the actual optical path conditions required in the actual application process. First, an example of a computing device is shown below.

[0049] Figure 1 A block diagram showing the structure of a computing device 100 according to an embodiment of the present invention.

[0050] As Figure 1 shown, in the basic configuration 102, the computing device 100 typically includes a system memory 106 and one or more processors 104. A memory bus 108 can be used for communication between the processor 104 and the system memory 106.

[0051] Depending on the desired configuration, processor 104 can be any type of processor, including but not limited to: a microprocessor (μP), a microcontroller (μC), a digital information processor (DSP), or any combination thereof. Processor 104 can include one or more levels of cache, such as level one cache 110 and level two cache 112, a processor core 114, and registers 116. Exemplary processor core 114 can include an arithmetic logic unit (ALU), a floating point unit (FPU), a digital signal processing core (DSP core), or any combination thereof. Exemplary memory controller 118 can be used with processor 104, or in some implementations, memory controller 118 can be an internal part of processor 104.

[0052] Depending on the desired configuration, system memory 106 can be any type of memory, including but not limited to: volatile memory (such as RAM), non-volatile memory (such as ROM, flash memory, etc.), or any combination thereof. System memory 106 can include an operating system 120, one or more applications 122, and program data 124. In some embodiments, applications 122 can be arranged to execute instructions on an operating system by one or more processors 104 using program data 124.

[0053] Computing device 100 can also include an interface bus 140 that facilitates communication from various interface devices (e.g., output device 142, peripheral interface 144, and communication device 146) to basic configuration 102 via a bus / interface controller 130. Exemplary output device 142 includes a graphics processing unit 148 and an audio processing unit 150. They can be configured to facilitate communication with various external devices, such as a display or speakers, via one or more A / V ports 152. Exemplary peripheral interface 144 can include a serial interface controller 154 and a parallel interface controller 156, which can be configured to facilitate communication with external devices, such as input devices (e.g., keyboard, mouse, pen, voice input device, touch input device) or other peripherals (e.g., printer, scanner, etc.), via one or more I / O ports 158. Exemplary communication device 146 can include a network controller 160, which can be arranged to facilitate communication with one or more other computing devices 162 via a network communication link through one or more communication ports 164.

[0054] A network communication link can be an example of a communication medium. A communication medium can generally embody computer-readable instructions, data structures, program modules in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium. A "modulated data signal" can be a signal in which one or more of its data sets or its changes can encode information in the signal. As a non-limiting example, a communication medium can include wired media such as a wired network or a dedicated line network, and various wireless media such as sound, radio frequency (RF), microwave, infrared (IR), or other wireless media. The term computer-readable medium used herein can include both storage media and communication media.

[0055] The computing device 100 can be implemented as a personal computer including a desktop computer and a laptop computer configuration. Of course, the computing device 100 can also be implemented as part of a small-sized portable (or mobile) electronic device, which can be such as a cellular phone, a digital camera, a personal digital assistant (PDA), a personal media player device, a wireless network browsing device, a personal head-mounted device, an application-specific device, or a hybrid device including any of the above functions. It can even be implemented as a server, such as a file server, a database server, an application server, and a WEB server, etc. Embodiments of the present invention are not limited thereto.

[0056] In an embodiment according to the present invention, the computing device 100 is configured to execute the method 200 for determining the multi-reflection chamber mirror parameters according to the present invention. Among them, the application 122 of the computing device 100 contains multiple program instructions for executing the method 200 for determining the multi-reflection chamber mirror parameters according to the present invention. The computing device determines the mirror parameters of the multi-reflection chamber suitable for forming a matrix-shaped light spot by executing the method 200 for determining the multi-reflection chamber mirror parameters of the present invention.

[0057] Figure 2 A schematic diagram of the method 200 for determining the multi-reflection chamber mirror parameters according to an embodiment of the present invention is shown.

[0058] It should be noted that first, it can be determined that the multi-reflection chamber of the present invention is a confocal cavity structure, and the multi-reflection chamber includes a first mirror and a second mirror arranged symmetrically. The method 200 for determining the multi-reflection chamber mirror parameters according to the present invention finally determines the mirror parameters of the first mirror and the second mirror. Specifically, the method 200 uses a genetic algorithm to determine the mirror parameters of the first mirror and the second mirror. And, the present invention presupposes that the first mirror and the second mirror respectively include a predetermined number of non-overlapping rectangular concave mirrors. Among them, the mirror parameters of the first mirror and the second mirror determined by the genetic algorithm include the position of the curvature center of each rectangular concave mirror in the first mirror and the second mirror, and the size of each rectangular concave mirror.

[0059] As Figure 2 shown, method 200 starts with step S210.

[0060] In step S210, a plurality of matrix spot formation order individuals are randomly generated as an initial population, and the maximum number of iterations is determined.

[0061] Subsequently, in step S220, based on the initial population and the maximum number of iterations, one or more iterations are performed to obtain one or more generations of populations.

[0062] Next, in step S230, the number of curvature centers corresponding to each matrix spot formation order individual in each generation of population (i.e., the number of rectangular concave mirrors) is calculated to determine the target matrix spot formation order corresponding to the number of curvature centers being a predetermined number. Here, by determining the matrix spot formation order individual corresponding to the number of curvature centers being a predetermined number, and determining the matrix spot formation order corresponding to this matrix spot formation order individual as the target matrix spot formation order.

[0063] Specifically, after calculating the number of curvature centers corresponding to each matrix spot formation order individual in each generation of population, it is judged whether the number of curvature centers is a predetermined number.

[0064] If the number of curvature centers is a predetermined number, the matrix spot formation order corresponding to the individual corresponding to this absolute value of the difference is determined as the target matrix spot formation order.

[0065] If the number of curvature centers is not a predetermined number, crossover and mutation operations are performed on each generation of population to obtain the next generation of population corresponding to each generation of population. Calculate the number of curvature centers corresponding to each individual in the next generation of population, and judge whether the number of curvature centers is a predetermined number. Until it is determined that the number of curvature centers is a predetermined number, the matrix spot formation order corresponding to the individual with the number of curvature centers being a predetermined number is determined as the target matrix spot formation order.

[0066] Finally, in step S240, based on the target matrix spot formation order, the mirror parameters of the first mirror and the second mirror are determined.

[0067] Specifically, in step S240, first, the target matrix spot formation order is used as the matrix spot formation order of the second mirror, and the reversed target matrix spot formation order (the matrix spot formation order reversed from the target matrix spot formation order) is used as the matrix spot formation order of the first mirror. It should be noted that according to the principle of reversibility of light path, when the matrix spot patterns of the first mirror and the second mirror are the same and the matrix spot formation orders are opposite, it can be determined that the first mirror and the second mirror are symmetric to each other. Based on this, the target matrix spot formation order is reversed and used as the matrix spot formation order of the other mirror.

[0068] Furthermore, based on the matrix spot formation orders of the first mirror and the second mirror, it is determined whether the first mirror and the second mirror can be respectively divided into a predetermined number of non-overlapping rectangular concave mirrors, so as to verify the feasibility of the target matrix spot formation order. Specifically, based on the matrix spot formation orders of the first mirror and the second mirror, the mirror positions of each spot in the matrix spot can be determined, that is, the rectangular concave mirror where each spot is located can be determined. Based on the mirror positions of each spot, it can be determined whether the first mirror and the second mirror can be respectively divided into a predetermined number of non-overlapping rectangular concave mirrors.

[0069] If it is determined that the first mirror and the second mirror can be respectively divided into a predetermined number of non-overlapping rectangular concave mirrors, it indicates that the feasibility verification of the target matrix spot formation order passes, and the mirror parameters and sizes of each rectangular concave mirror included in the first mirror and the second mirror are also determined, thereby determining the mirror parameters of the first mirror and the second mirror. In addition, if the first mirror and the second mirror cannot be respectively divided into a predetermined number of non-overlapping rectangular concave mirrors, it indicates that the feasibility verification of the target matrix spot formation order fails, and this result is abandoned.

[0070] According to the above steps S210 - S240, the mirror parameters of the first mirror and the second mirror can be determined by using the genetic algorithm. Among them, the mirror parameters include the curvature center positions of each rectangular concave mirror in the first mirror and the second mirror, and the sizes of each rectangular concave mirror.

[0071] It should be noted that the multi-reflection gas chamber to be designed in the present invention is a confocal cavity structure. Under the paraxial approximation condition, the positions of the continuous images formed by the confocal cavity type multi-reflection gas chamber conform to the following rules: the object point and the image point near the curvature center are collinear, and the midpoint of the object point and the image point is located at the curvature center. If a matrix spot pattern is to be formed on one mirror surface of the multi-reflection gas chamber, at least 3 reflectors need to be arranged on the other mirror surface.

[0072] Based on this, the mutually symmetric first mirror surface and second mirror surface designed in the present invention include at least 3 rectangular concave mirrors. That is, the minimum value of the predetermined quantity is 3. Specifically, the value range of the predetermined quantity K is K≥3, and K is a positive integer. However, it should be noted that the present invention does not limit the specific value of the predetermined quantity. In practical applications, the specific value of the predetermined quantity can be determined by those skilled in the art according to actual needs.

[0073] According to an embodiment of the present invention, the predetermined quantity can be determined as 3. In this way, while ensuring that matrix-shaped light spots can be formed on the first mirror surface and the second mirror surface of the multi-reflection air chamber, the number of required rectangular concave mirrors is the least, which is beneficial to reducing the cost in actual use. In other embodiments, the predetermined quantity can be, for example, 4 or other values, and the present invention does not make specific limitations thereto.

[0074] In one implementation manner of the present invention, for steps S210 to S230, the genetic algorithm can be used to solve this problem until the target matrix-shaped light spot formation sequence corresponding to |N - 3| = 0 is determined. In the formula, N represents the number of curvature centers, and the predetermined quantity is 3. |N - 3| = 0 is the optimal solution to be solved in the present invention.

[0075] Specifically, randomly generate M matrix-shaped light spot formation sequence individuals as the initial population P(0), where the j-th individual is p(0, j). And set the maximum number of iterations as T, and initialize the iteration number counter t = 1. Then, enter the inner loop. By calculating the fitness |N(t, j) - 3| of all individuals in the t-th generation population, determine whether the fitness |N(t, j) - 3| is equal to 0. It can be understood that the fitness is the absolute value of the difference between the number of curvature centers corresponding to the matrix-shaped light spot formation sequence individual and the predetermined quantity. If the fitness is not equal to 0, the roulette wheel method can be used to select parents from the population to generate a mating pool.

[0076] Next, the single-point sorting crossover operator can be applied to the population, and the single-point sorting crossover operator is used to perform crossover operations on the parents to generate one or more new individuals, where the probability of performing crossover operations on each pair of parents is p c . Then, the single-point mutation operator is applied to the population, and the single-point sorting crossover operator is used to perform mutation operations on the individuals, where the probability of performing mutation operations on each individual is p v . In this way, through the crossover operations and mutation operations on the population, the next-generation population P(t + 1) can be obtained. Then, calculate whether the fitness of all individuals in the next-generation population is equal to 0. Until the optimal solution with a fitness equal to 0 is found.

[0077] If the optimal solution satisfying |N - 3| = 0 is still not found when t > T, then set t = 1 and start the iteration again.

[0078] In one embodiment, the number of rows and columns of the matrix-shaped light spot corresponding to each individual is set to 4, and the number of individuals M for the matrix-shaped light spot formation order is set to 5000. The probabilities of the crossover operation and the mutation operation are p c = 0.5 and p v = 0.3 respectively, and the maximum number of iterations is set to T = 50. Two optimal solutions can be obtained, corresponding to two target matrix-shaped light spot formation orders.

[0079] Figure 3 The schematic diagrams of two target matrix-shaped light spot formation orders corresponding to the two optimal solutions are shown.

[0080] As Figure 3 shown, the B side corresponds to the matrix-shaped light spot formation order on the second mirror surface, that is, the target matrix-shaped light spot formation order determined according to the method 200 of the present invention; the A side corresponds to the matrix-shaped light spot formation order on the first mirror surface, that is, the reversed target matrix-shaped light spot formation order. It can be understood that the numbers in the figure represent the light spot formation order from small to large.

[0081] As Figure 3 shown, the straight lines in the figure are dividing lines. Each side of the mirror surface includes two dividing lines, and the two dividing lines divide each side of the mirror surface into 3 rectangular concave mirrors. The "×" in the figure represents the curvature center of each rectangular concave mirror, where Figure 3 the three "×" shown in the B side represent the curvature centers of the three rectangular concave mirrors on the first mirror surface; the three "×" shown in the A side represent the curvature centers of the three rectangular concave mirrors on the second mirror surface. That is to say, the curvature centers of the three rectangular concave mirrors on the first mirror surface are located on the second mirror surface, and the curvature centers of the three rectangular concave mirrors on the second mirror surface are located on the first mirror surface.

[0082] It can be understood that if a multi-reflection gas chamber with 4 rectangular concave mirrors on each of the first mirror surface and the second mirror surface needs to be designed, the predetermined number can be determined as 4. Correspondingly, in the above steps S210 to S230, the genetic algorithm can be used to solve this problem until the target matrix-shaped light spot formation order corresponding to the predetermined number of 4 is determined.

[0083] According to the two target matrix-shaped light spot formation orders corresponding to the two optimal solutions determined by the above method 200, two sets of mirror surface parameters and the corresponding two structures of the multi-reflection gas chamber can be determined. Therefore, the present invention designs two structures of multi-reflection gas chambers suitable for forming matrix-shaped light spots.

[0084] Figure 4 The schematic diagram of the structure of the multi-reflection gas chamber 400 according to the first embodiment of the present invention is shown. Figure 5FIG. 4 is a schematic diagram showing a multi-reflector gas chamber 400 according to a first embodiment of the present invention forming a matrix-type light spot on two side mirror surfaces.

[0085] Figure 6 FIG. 4 shows a schematic structural diagram of a multi-reverse air chamber 400 according to a second embodiment of the present invention. Figure 7 FIG. 4 is a schematic diagram showing a multi-reflective gas chamber 400 according to a second embodiment of the present invention forming a matrix-type light spot on two side mirror surfaces.

[0086] like Figure 4 and Figure 6 As shown, the multi-reflective air chamber 400 includes a first mirror surface 410 and a second mirror surface 420 that are symmetrically arranged. The first mirror surface 410 and the second mirror surface 420 each include a predetermined number of non-overlapping rectangular concave mirrors. Here, the rectangular concave mirror refers to a concave mirror with a rectangular projection shape. The concave mirror can be a concave spherical reflector, and the rectangular concave mirror can be a rectangular concave spherical reflector.

[0087] like Figure 4 and Figure 6 As shown, the present invention takes the midpoint of the line connecting the geometric centers of the first mirror surface 410 and the second mirror surface 420 as the origin O, and takes the straight line connecting the geometric centers of the first mirror surface 410 and the second mirror surface 420 as the z-axis to establish a coordinate axis. In the description of the following embodiments, the vertical direction refers to the y-axis direction, and the horizontal direction refers to the x-axis direction.

[0088] According to one embodiment of the present invention, the first mirror surface 410 and the second mirror surface 420 are respectively formed by splicing a predetermined number of non-overlapping rectangular concave mirrors together, and the projection shape of the first mirror surface 410 and the second mirror surface 420 (the projection shape along the z-axis direction) is a rectangle.

[0089] It can be understood that, based on the mutual symmetry between the first mirror surface 410 and the second mirror surface 420 of the multi-reflective air chamber 400, each rectangular concave mirror in the first mirror surface 410 is symmetrical with the corresponding rectangular concave mirror in the second mirror surface 420.

[0090] According to the multi-reverse air chamber 400 of the present invention, Figure 5 As shown, an incident hole (in) is provided on the first mirror surface 410 or the second mirror surface 420, and the light incident through the incident hole can be emitted after multiple reflections between the first mirror surface 410 and the second mirror surface 420, and is suitable for forming mutually symmetrical matrix light spots on the first mirror surface 410 and the second mirror surface 420. In other words, the light forms matrix light spots on the first mirror surface 410 and the second mirror surface 420, respectively, and the matrix light spots formed on the first mirror surface 410 and the second mirror surface 420 are symmetrical to each other.

[0091] It should be noted that the matrix-shaped light spots formed on the first mirror surface 410 and the second mirror surface 420 include a plurality of light spots arranged in multiple rows and at least one column, and the plurality of light spots are arranged in a matrix shape. Specifically, the projection shapes of the plurality of light spots formed on the first mirror surface 410 and the second mirror surface 420 in the z-axis direction are matrix-shaped.

[0092] According to an embodiment of the present invention, the predetermined number is 3.

[0093] Specifically, as Figures 4 to 7 shown, the first mirror surface 410 and the second mirror surface 420 respectively include 3 non-overlapping rectangular concave mirrors. Optionally, the first mirror surface 410 and the second mirror surface 420 are respectively formed by splicing 3 non-overlapping rectangular concave mirrors together, and the projection shape is a rectangular mirror surface.

[0094] In this embodiment, the first mirror surface 410 includes a first rectangular concave mirror M 1 that are spliced together, a second rectangular concave mirror M 2 , and a third rectangular concave mirror M 3 . Among them, the first curvature center C 1 of the first rectangular concave mirror is collinear with the third curvature center C 3 of the third concave mirror. In other words, the first rectangular concave mirror and the third concave mirror are conjugate reflectors. Among them, the second rectangular concave mirror M 2 of the first mirror surface 410 is provided with an incident hole (in).

[0095] Correspondingly, the second mirror surface 420 includes a fourth rectangular concave mirror M 4 that are spliced together, a fifth rectangular concave mirror M 5 , and a sixth rectangular concave mirror M 6 . Among them, the fourth rectangular concave mirror and the first rectangular concave mirror have the same mirror surface parameters and are symmetrically arranged; the fifth rectangular concave mirror and the second rectangular concave mirror have the same mirror surface parameters and are symmetrically arranged; the sixth rectangular concave mirror and the third rectangular concave mirror have the same mirror surface parameters and are symmetrically arranged. And, the fourth curvature center C 4 of the fourth rectangular concave mirror is collinear with the sixth curvature center C 6 of the sixth concave mirror. In other words, the fourth rectangular concave mirror and the sixth concave mirror are conjugate reflectors. Among them, the fifth rectangular concave mirror M 5 of the second mirror surface 420 is provided with an exit hole (out).

[0096] It should be noted that the mirror surface parameters of the rectangular concave mirror include the curvature center (position) of the rectangular concave mirror and the size of the rectangular concave mirror.

[0097] It should be understood that based on the symmetry relationship between the first mirror surface 410 and the second mirror surface 420, as well as the symmetry relationship between each rectangular concave mirror in the first mirror surface 410 and each rectangular concave mirror in the second mirror surface 420, after determining the mirror surface parameters of the first mirror surface 410, the mirror surface parameters of the second mirror surface 420 are also correspondingly determined. Moreover, the positional relationship (including the positional relationship of the curvature centers) and dimensional relationship among the first rectangular concave mirror, the second rectangular concave mirror, and the third rectangular concave mirror in the first mirror surface 410 are equally applicable to the positional relationship (including the positional relationship of the curvature centers) and dimensional relationship among the fourth rectangular concave mirror, the fifth rectangular concave mirror, and the sixth rectangular concave mirror in the second mirror surface 420.

[0098] It should also be noted that in the embodiments of the present invention, regarding the first mirror surface 410 and its first rectangular concave mirror, second rectangular concave mirror, and third rectangular concave mirror, the described mirror surface parameters, positional relationship (including the positional relationship of the curvature centers), dimensional relationship, and the relationship between the matrix-shaped light spot formed on the first mirror surface 410 and each curvature center are all applicable to the second mirror surface 420 and its fourth rectangular concave mirror, fifth rectangular concave mirror, and sixth rectangular concave mirror.

[0099] According to an embodiment of the present invention, as Figures 4 to 7 shown, the multi-reflection gas chamber of the present invention is a symmetric confocal cavity structure. Specifically, each rectangular concave mirror (including the first rectangular concave mirror M 1 , the second rectangular concave mirror M 2 , the third rectangular concave mirror M 3 , the fourth rectangular concave mirror M 4 , the fifth rectangular concave mirror M 5 , the sixth rectangular concave mirror M 6 ) is a rectangular concave spherical mirror, and the radius of curvature of each rectangular concave mirror is the same, and the radius of curvature is equal to the distance between the first mirror surface 410 and the second mirror surface 420 (the chamber length of the multi-reflection gas chamber). For example, the radius of curvature is R, and the distance between the first mirror surface 410 and the second mirror surface 420 is R. Moreover, the focus of each rectangular concave mirror is located at the center of the chamber of the multi-reflection gas chamber (i.e., the geometric center of the first mirror surface 410 and the second mirror surface 420, the origin O of the coordinate axis).

[0100] Based on this, the curvature centers of the respective rectangular concave mirrors of the first mirror surface 410 are located on the second mirror surface 420; the curvature centers of the respective rectangular concave mirrors of the second mirror surface 420 are located on the first mirror surface 410. Specifically, as Figure 4 shown, the first curvature center (C 1 ) of the first rectangular concave mirror, the second curvature center (C 2 ) of the second rectangular concave mirror, the second curvature center (C 3) are distributed on the second mirror 420. The first curvature center (C 4 ) of the fourth rectangular concave mirror, the second curvature center (C 5 ) of the fifth rectangular concave mirror, and the second curvature center (C 6 ) of the sixth rectangular concave mirror are distributed on the first mirror 410.

[0101] In an embodiment of the present invention, as Figure 5 and Figure 7 shown, the number of rows of the matrix-shaped light spot is m, and the number of columns is n. That is to say, the matrix-shaped light spots that the light can form on the first mirror 410 and the second mirror 420 respectively include a plurality of light spots arranged in m rows and n columns, and both m and n are positive integers. The row pitch (i.e., the vertical pitch, the pitch in the y-axis direction) of the matrix-shaped light spot is expressed as d l . The column pitch (i.e., the horizontal pitch, the pitch in the x-axis direction) of the matrix-shaped light spot is expressed as d c .

[0102] Thus, when the first mirror 410 and the second mirror 420 are exactly filled by their respective matrix-shaped light spots, the overall height (the length along the y-axis direction) of the first mirror 410 and the second mirror 420 is md l . The overall length (the length along the x-axis direction) of the first mirror 410 and the second mirror 420 is nd c .

[0103] According to the first embodiment, as Figure 4 and Figure 5 shown, the first rectangular concave mirror M 1 , the second rectangular concave mirror M 2 , and the third rectangular concave mirror M 3 are spliced in sequence along the vertical direction (y-axis direction), and the projection shape of the first mirror 410 formed by the splicing along the z-axis direction is a rectangle.

[0104] Among them, the height of the first rectangular concave mirror M 1 is equal to the sum of the heights (the lengths along the y-axis direction) of the second rectangular concave mirror M 2 and the third rectangular concave mirror M 3 , and the lengths (the lengths along the x-axis direction) of the first rectangular concave mirror M 1 , the second rectangular concave mirror M 2 , and the third rectangular concave mirror M 3 are the same. As Figure 5 shown, the height of the first rectangular concave mirror M 1 can be expressed as The height of the second rectangular concave mirror M 2 can be expressed as d l , and the height of the third rectangular concave mirror M 3The height can be expressed as And, the first rectangular concave mirror M 1 , the second rectangular concave mirror M 2 , the third rectangular concave mirror M 3 The lengths in the x-axis direction are all expressed as nd c .

[0105] In addition, the first curvature center C of the first rectangular concave mirror 1 and the third curvature center C of the third rectangular concave mirror 3 are located on a straight line in the vertical direction. In other words, the first curvature center C 1 and the third curvature center C 3 are arranged at intervals in the vertical direction (y-axis direction).

[0106] In the first embodiment, as Figure 5 shown, the incident hole (in) provided on the second rectangular concave mirror of the first mirror surface 410, the first light spot (light spot 0, denoted as B0) formed by the light on the fourth rectangular concave mirror of the second mirror surface 420, the exit hole (out) provided on the fifth rectangular concave mirror of the second mirror surface 420, and the curvature centers C of each rectangular concave mirror 1 ~C 6 The coordinates are respectively expressed as:

[0107]

[0108]

[0109]

[0110] From Figure 5 the matrix-type light spot formation sequence marked on the first mirror surface 410 and the second mirror surface 420, it can be seen that the propagation mode of the light in the multi-reflection chamber and the process of forming the matrix-type light spot are as follows: The light enters the multi-reflection chamber from the incident hole (in) on the first mirror surface 410 and forms the first light spot 0 on the second mirror surface 420 (that is, the incident light is imaged at the light spot 0 of the second mirror surface 420). Based on the first rectangular concave mirror M of the first mirror surface 410 1 and the third rectangular concave mirror M 3 (conjugate reflecting mirror), the light incident through the incident hole forms the first pair of column light spots on the second mirror surface 420 based on the row pitch of d l (equivalent to the image of the incident hole being continuously focused on the second mirror surface 420). For the formation sequence of the first pair of column light spots, refer to the light spots 0, 1, 2, 3,..., m - 4, m - 3, m - 2, m - 1 marked on the second mirror surface 420 in Figure 5 . It should be noted that the vertical spacing of the light spots is related to the conjugate reflecting mirrors M 1 and M3 is related to the distance of the center of curvature (vertical distance). In one embodiment, the first rectangular concave mirror M 1 has a first center of curvature C 1 and the third rectangular concave mirror M 3 has a third center of curvature C 3 and the vertical distance therebetween is d l / 2, and the vertical spacing (row spacing) of the light spots is d l , that is to say, the vertical spacing (row spacing) of the light spots is twice the vertical distance between the first center of curvature C 1 and the third center of curvature C 3 .

[0111] Until a light spot m-1 is formed on the fifth rectangular concave mirror M 5 of the second mirror 420, the light will be reflected to the second rectangular concave mirror M 2 of the first mirror 410 to form a light spot m. The position of the light spot m (which can be regarded as a new incident hole) is horizontally offset by d c relative to the position of the incident hole, that is, the horizontal spacing (column spacing) of the light spots formed on the first mirror 410 is d c . Subsequently, the light is emitted from the light spot m to the second mirror 420 again and forms a light spot m of the second pair of column light spots on the fourth rectangular concave mirror M 4 of the second mirror 420. The position of the light spot m is horizontally offset by d c relative to the light spot 0, that is, the horizontal spacing (column spacing) of the light spots formed on the second mirror 420 is d c . The offset of the light spot m will cause the light emitted to the second mirror 420 again to form a second pair of column light spots on the second mirror 420 based on the row spacing of d l . For the formation process of the light spots on the second mirror 420, see the light spots m, m+1, m+2, m+3,…2m-4, 2m-3, 2m-2, 2m-1 marked on the second mirror 420 in Figure 5 . It should be noted that after the light spot m-1 is formed on the fifth rectangular concave mirror M 5 of the second mirror 420, for the formation process of the light spots on the second mirror 420, the light spots will be symmetrically offset with the second center of curvature C 2 of the second rectangular concave mirror as the center of symmetry, and then form a second pair of column light spots.

[0112] It should be noted that the horizontal spacing of the light spots is related to the distance of the center of curvature (horizontal distance) between the second rectangular concave mirror M 2 and the first rectangular concave mirror M 1 . In one embodiment, the second rectangular concave mirror M 2 has a second center of curvature C2 The horizontal distance from the first rectangular concave mirror M 1 to the first curvature center C 1 is d c / 2, and the horizontal spacing (column spacing) of the light spots is d c , that is, in the x-axis direction, the horizontal spacing (row spacing) of the light spots is twice the horizontal distance between the second curvature center C 2 and the first curvature center C 1 .

[0113] In addition, to make each row of light spots at the same height in the y-axis direction (for example, the light spot m and the light spot 0 are at the same height), it is necessary to ensure that the horizontal distance between the second curvature center C 2 and the first curvature center C 1 is equal to (d c / 2). In other words, when the first direction is the vertical direction, the second direction distance between the second curvature center C 2 and the first curvature center C 1 is: In the formula, L represents the second direction distance between the second curvature center C 2 and the first curvature center C 1 , m represents the number of rows of the matrix-shaped light spots, and d l represents the first direction spacing of the matrix-shaped light spots.

[0114] According to the above light spot formation rule, continue to form the third pair of column light spots, the fourth pair of column light spots,..., until the light exits from the exit hole (out). At this time, a complete matrix-shaped light spot arranged in m rows and n columns is formed on the second mirror 420, and a matrix-shaped light spot of the same pattern is also formed on the first mirror 410 according to a similar rule. Here, the formation order of the matrix-shaped light spot formed on the first mirror 410 is reversed with respect to the matrix-shaped light spot formed on the second mirror 420, so symmetric matrix-shaped light spots are formed.

[0115] In the first embodiment, the value range of the number of rows m of the matrix-shaped light spots can be m≥4, and m is an even number. The number of columns n of the matrix-shaped light spots can be a positive integer.

[0116] In the embodiment of the present invention, the relationship between the number of light passes pass and the number of light spots (mn) included in the matrix-shaped light spots can be expressed by the following formula: pass = 2mn - 1.

[0117] According to the second embodiment, as Figure 6 and Figure 7 shown, the first rectangular concave mirror M 1 is respectively connected to the second rectangular concave mirror M 2 , the third rectangular concave mirror M3 Join them, and the projection shape of the first mirror surface 410 formed by joining along the z-axis direction is a rectangle.

[0118] Among them, the length of the first rectangular concave mirror is equal to the sum of the lengths of the second rectangular concave mirror and the third rectangular concave mirror (the length along the x-axis), and the heights (the lengths along the y-axis) of the first rectangular concave mirror, the second rectangular concave mirror, and the third rectangular concave mirror are the same. As Figure 7 shown, the length of the first rectangular concave mirror M 1 along the x-axis can be expressed as nd c ; the length of the second rectangular concave mirror M 2 along the x-axis can be expressed as (n - 1)d c ; the height of the third rectangular concave mirror M 3 can be expressed as d c . And, the lengths of the first rectangular concave mirror M 1 , the second rectangular concave mirror M 2 , and the third rectangular concave mirror M 3 along the y-axis are all expressed as md l .

[0119] In addition, the first curvature center C 1 and the third curvature center C 3 are located on a horizontal straight line. In other words, the first curvature center C 1 and the third curvature center C 3 are arranged at intervals along the horizontal direction (x-axis direction).

[0120] In the second embodiment, as Figure 7 shown, the incident hole (in) provided on the second rectangular concave mirror of the first mirror surface 410, the first light spot (light spot 0, denoted as B0) formed by the light on the fourth rectangular concave mirror of the second mirror surface 420, the exit hole (out) provided on the fifth rectangular concave mirror of the second mirror surface 420, and the curvature centers C 1 ~C 6 of each rectangular concave mirror are respectively expressed as:

[0121]

[0122]

[0123]

[0124] From Figure 7It can be seen from the formation sequence of the matrix-shaped light spots marked on the first mirror surface 410 and the second mirror surface 420 that the propagation mode of light in the multi-reflection chamber and the process of forming the matrix-shaped light spots are as follows: The light enters the multi-reflection chamber from the incident hole (in) on the first mirror surface 410 and forms the first light spot 0 on the second mirror surface 420 (i.e., the incident light is imaged at the light spot 0 on the second mirror surface 420). Based on the first rectangular concave mirror M of the first mirror surface 410 1 and the third rectangular concave mirror M 3 (conjugate reflecting mirror), the light incident through the incident hole forms the first pair of row light spots on the second mirror surface 420 based on the column pitch of d c (equivalent to the image of the incident hole being continuously focused on the second mirror surface 420). As shown in Figure 7 , the first pair of row light spots are distributed in the positive and negative half-axis regions of the y-axis and are symmetric with respect to the x-axis. The formation sequence of the first pair of row light spots can be referred to the light spots 0, 1, 2, 3, 4, 5,... 2n - 6, 2n - 5, 2n - 4, 2n - 3, 2n - 2, 2n - 1 marked on the second mirror surface 420 in Figure 7 . It should be noted that the horizontal spacing (column pitch) of the light spots is related to the distance between the curvature centers (horizontal distance) of the conjugate reflecting mirrors M 1 and M 3 . In one embodiment, the horizontal distance between the first curvature center C 1 of the first rectangular concave mirror M and the third curvature center C 1 of the third rectangular concave mirror M 3 is d 3 / 2, and the horizontal spacing (column pitch) of the light spots is d c , that is to say, the horizontal spacing (column pitch) of the light spots is twice the horizontal distance between the first curvature center C c and the third curvature center C 1 and C 3 .

[0125] Until after the light spot 2n - 1 is formed on the fifth rectangular concave mirror M 5 of the second mirror surface 420, the light will be reflected to the second rectangular concave mirror M 2 on the first mirror surface 410 to form the light spot 2n. The position of the light spot 2n - 1 (which can be regarded as a new incident hole) is offset by d l vertically relative to the position of the incident hole, that is, the vertical spacing (row pitch) of the light spots formed on the first mirror surface 410 is d l . Subsequently, the light shoots from the light spot 2n to the second mirror surface 420 again and forms the light spot 2n of the second pair of row light spots on the fourth rectangular concave mirror M 4 of the second mirror surface 420. The position of the light spot 2n is offset by d l vertically relative to the light spot 0, that is, the vertical distance (row pitch) of the light spots formed on the second mirror 420 is d l . The offset of the light spot 2n will cause the light rays that are incident on the second mirror 420 again to form a second pair of row light spots on the second mirror 420 based on the column pitch of d c . For the formation order of the second pair of row light spots, refer to the light spots 2n, 2n + 1, 2n + 2, 2n + 3, 2n + 4, 2n + 5, … 4n - 6, 4n - 5, 4n - 4, 4n - 3, 4n - 2, 4n - 1 marked on the second mirror 420 in Figure 7 . It should be noted that after the light spot 2n - 1 is formed on the fifth rectangular concave mirror M of the second mirror 420, for the formation process of the light spots on the second mirror 420, the light spots will be symmetrically offset with the second curvature center C of the second rectangular concave mirror 5 as the center of symmetry, and then form a second pair of row light spots. In one implementation, the second curvature center C 2 is located at the exit hole (out) on the fifth rectangular concave mirror 2 .

[0126] It should be noted that the vertical distance of the light spots is related to the distance (vertical distance) between the curvature centers of the second rectangular concave mirror M 2 and the first rectangular concave mirror M 1 . In one embodiment, the vertical distance between the second curvature center C 2 of the second rectangular concave mirror M 2 and the first curvature center C 1 of the first rectangular concave mirror M 1 is d l / 2, and the vertical distance (column pitch) of the light spots is d l . That is to say, in the x-axis direction, the vertical distance (row pitch) of the light spots is twice the vertical distance between the second curvature center C 2 and the first curvature center C 1 .

[0127] In addition, in this embodiment, when the first direction is the horizontal direction, the second direction distance between the second curvature center C 2 and the first curvature center C 1 satisfies: In the formula, L represents the second direction distance between the second curvature center C 2 and the first curvature center C 1 , n represents the number of columns of the matrix light spots, and d c represents the first direction pitch of the matrix light spots

[0128] According to the above light spot formation rule, the third pair of row light spots, the fourth pair of row light spots, etc. are continuously formed until the light exits from the exit hole (out) on the fifth rectangular concave mirror. At this time, a complete matrix light spot arranged in m rows and n columns is formed on the second mirror 420, and a matrix light spot of the same pattern is also formed on the first mirror 410 according to a similar rule. Here, the formation order of the matrix light spot formed on the first mirror 410 is reversed with respect to that of the matrix light spot formed on the second mirror 420, so symmetric matrix light spots are formed.

[0129] In the second embodiment, the number of rows m of the matrix light spot can take a value in the range of m≥2, and m is an even number. The number of columns n of the matrix light spot can take a positive integer value. And the relationship between the number of light passes pass and the number of light spots (mn) included in the matrix light spot can be expressed by the following formula: pass = 2mn - 1.

[0130] It should be noted that according to the multi-reflection air chamber of the first embodiment and the second embodiment of the present invention, the condition of reversible light path is satisfied. Therefore, when the light is incident from the exit hole (out) on the fifth rectangular concave mirror of the second mirror 420 and undergoes multiple reflections between the first mirror 410 and the second mirror 420, it can exit from the entrance hole (in) on the second rectangular concave mirror of the first mirror 410, and a matrix light spot pattern the same as that in the above embodiment (incident from the entrance hole in and exiting from the exit hole out) is formed on the first mirror 410 and the second mirror 420.

[0131] In other words, according to the multi-reflection air chamber 400 of the present invention, the entrance hole can be provided on the second rectangular concave mirror of the first mirror 410 or on the fifth rectangular concave mirror of the second mirror 420. Correspondingly, the exit hole corresponding to the entrance hole can be provided on the fifth rectangular concave mirror of the second mirror 420 or on the second rectangular concave mirror of the first mirror 410.

[0132] According to the first embodiment and the second embodiment described above, it can be obtained that the matrix light spots finally formed on the first mirror 410 and the second mirror 420 have the following relationship with the curvature centers of the respective rectangular concave mirrors:

[0133] Assume that the first curvature center (C 1 ) and the third curvature center (C 3 ) are located on a straight line in the first direction. Correspondingly, the fourth curvature center (C 4 ) and the sixth curvature center (C 6It is located on a straight line in the first direction. Here, the first direction can be the vertical direction or the horizontal direction, and the second direction is a direction perpendicular to the first direction. That is to say, when the first direction is the vertical direction (y-axis direction), the second direction is the horizontal direction (x-axis direction); when the first direction is the horizontal direction (x-axis direction), the second direction is the vertical direction (y-axis direction).

[0134] Then, the first-direction spacing of the matrix-shaped light spots formed on the first mirror surface 410 and the second mirror surface 420 is twice the first-direction distance between the first curvature center (C 1 ) and the third curvature center (C 3 ). Here, it is assumed that the first-direction distance between the first curvature center (C 1 ) and the third curvature center (C 3 ) is D 1 / 2, then the first-direction spacing of the matrix-shaped light spots is D 1 .

[0135] The second-direction spacing of the matrix-shaped light spots is twice the second-direction distance between the second curvature center (C 2 ) and the first curvature center (C 1 ). Here, it is assumed that the second-direction distance between the second curvature center (C 2 ) and the first curvature center (C 1 ) is D 2 / 2, then the second-direction spacing of the matrix-shaped light spots is D 2 .

[0136] Among them, in the multi-reflection gas chamber of the first embodiment shown in Figures 4 to 5 , the first direction is specifically the vertical direction (y-axis direction), the second direction is the horizontal direction (x-axis direction), and D 1 is specifically d l , and D 2 is specifically d c .

[0137] In Figures 6 to 7 the multi-reflection gas chamber of the second embodiment shown, the first direction is specifically the horizontal direction (x-axis direction), the second direction is the vertical direction (y-axis direction), and D 1 is specifically d c , and D 2 is specifically d l .

[0138] In addition, in other embodiments, the predetermined number can be 4. Specifically, the first mirror surface and the second mirror surface of the multi-reflection gas chamber can respectively include 4 non-overlapping rectangular concave mirrors (not shown in the figure). Optionally, the first mirror surface and the second mirror surface are respectively formed by splicing 4 non-overlapping rectangular concave mirrors together, and the projected shape is a rectangular mirror surface.

[0139] Specifically, the first mirror surface includes a first rectangular concave mirror, a second rectangular concave mirror, a third rectangular concave mirror, and a fourth rectangular concave mirror that are spliced together. In one embodiment, the first rectangular concave mirror and the third rectangular concave mirror are spliced along the vertical direction, and the first rectangular concave mirror and the fourth rectangular concave mirror are spliced along the horizontal direction. The second rectangular concave mirror and the first rectangular concave mirror are arranged diagonally, the second rectangular concave mirror and the fourth rectangular concave mirror are spliced along the vertical direction, and the second rectangular concave mirror and the third rectangular concave mirror are spliced along the horizontal direction. Moreover, the projected shape of the first mirror surface formed by splicing the four rectangular concave mirrors is rectangular. Among them, the second curvature center of the second rectangular concave mirror and the fourth curvature center of the fourth concave mirror are collinear in the vertical direction, and the first curvature center of the first rectangular concave mirror and the fourth curvature center of the fourth concave mirror are collinear in the horizontal direction.

[0140] Correspondingly, the second mirror surface includes a fifth rectangular concave mirror, a sixth rectangular concave mirror, a seventh rectangular concave mirror, and an eighth rectangular concave mirror that are spliced together. Among them, the fifth rectangular concave mirror and the first rectangular concave mirror have the same mirror surface parameters and are symmetrically arranged; the sixth rectangular concave mirror and the second rectangular concave mirror have the same mirror surface parameters and are symmetrically arranged; the seventh rectangular concave mirror and the third rectangular concave mirror have the same mirror surface parameters and are symmetrically arranged; the eighth rectangular concave mirror and the fourth rectangular concave mirror have the same mirror surface parameters and are symmetrically arranged.

[0141] According to an embodiment of the present invention, multiple laser beams can be incident into the multi-reflection gas chamber 400, and each laser beam is respectively suitable for detecting a kind of gas. Specifically, a plurality of incident holes can be provided on the second rectangular concave mirror and / or the fifth rectangular concave mirror, and the multiple laser beams can be incident into the multi-reflection gas chamber from different incident holes.

[0142] Among them, after the multiple laser beams are incident through the multiple incident holes, they are reflected multiple times between the first mirror surface and the second mirror surface and then emitted. Each laser beam incident through each incident hole forms a corresponding matrix-shaped light spot on the first mirror surface and the second mirror surface respectively, and it is necessary to ensure that the multiple groups of matrix-shaped light spots formed by the multiple laser beams on the first mirror surface and the second mirror surface do not overlap.

[0143] In this way, according to the multi-reflection gas chamber 400 of the present invention, it is possible to simultaneously detect multiple gases by multiple laser beams, improving the utilization rate of the multi-reflection gas chamber and the detection efficiency of the gases.

[0144] According to the multi-reflection chamber 200 provided by the present invention, various matrix-shaped light spot patterns can be formed. Specifically, by adjusting one or more of the positions of the incident holes and the exit holes, the incident direction, and the positions of the centers of curvature of the respective rectangular concave mirrors, the number of rows and columns, the row pitch, and the column pitch of the matrix-shaped light spots finally formed on the first mirror surface and the second mirror surface can be changed, thereby obtaining various matrix-shaped light spot patterns. It should be noted that the optical path is related to the number of light passes and the distance between the first mirror surface and the second mirror surface (radius of curvature R), and the number of rows (m) and columns (n) of the matrix-shaped light spots determine the number of light passes (pass = 2mn - 1), and thus also determine the optical path.

[0145] Based on this, the present invention provides a method 800 for determining the formation of matrix-shaped light spots in a multi-reflection chamber, to perform an extended analysis on the types of matrix-shaped light spot patterns that can be formed by the multi-reflection chamber of the present invention, so as to select the optimal matrix-shaped light spot pattern according to the actual optical path conditions required in the actual application process.

[0146] According to an embodiment of the present invention, the computing device 100 is configured to execute the method 800 for determining the formation of matrix-shaped light spots in a multi-reflection chamber according to the present invention. Among them, the application 122 of the computing device 100 contains multiple program instructions for executing the method 800 for determining the formation of matrix-shaped light spots in a multi-reflection chamber according to the present invention.

[0147] It should be noted that the method 800 for determining the formation of matrix-shaped light spots in a multi-reflection chamber according to the present invention establishes an optical model based on the parameters of the first mirror surface and the second mirror surface in the multi-reflection chamber, and traces the path of light based on the optical model to determine the matrix-shaped light spots formed by the light on the mirror surface.

[0148] Figure 8 The flowchart of the method 800 for determining the formation of matrix-shaped light spots in a multi-reflection chamber according to an embodiment of the present invention is shown. The method 800 is suitable for execution in a computing device (such as the aforementioned computing device 100).

[0149] As Figure 8 shown, the method 800 starts from step S810.

[0150] In step S810, an optical model of the multi-reflection chamber is established based on the mirror surface parameters of the first mirror surface and the second mirror surface of the multi-reflection chamber.

[0151] Here, according to the optical model, the path of the light incident into the multi-reflection chamber in the multi-reflection chamber can be determined, and the path information includes each light spot formed by the light on the first mirror surface and the second mirror surface. Thus, the matrix-shaped light spots finally formed by the light on the first mirror surface and the second mirror surface can be determined according to the optical model. The matrix-shaped light spots include multiple light spots arranged in m rows and n columns.

[0152] Subsequently, in step S820, based on the first predetermined distance interval, a first-direction distance array of curvature centers is constructed for the first curvature center (C 1 ) of the first rectangular concave mirror and the third curvature center (C 3 ) of the third rectangular concave mirror.

[0153] Here, according to the multi-reflection air chamber 400 described above, for the multi-reflection air chamber structure of the first embodiment, the first direction is the vertical direction, and the first-direction distance between the first curvature center C 1 and the third curvature center C 3 can affect the vertical direction spacing (row spacing) of the matrix-shaped light spots finally formed on the first mirror surface and the second mirror surface, and thus also affect the number of rows of the matrix-shaped light spots.

[0154] For the multi-reflection air chamber structure of the second embodiment, the first direction is the horizontal direction. The first-direction distance between the first curvature center C 1 and the third curvature center C 3 can affect the horizontal direction spacing (column spacing) of the matrix-shaped light spots finally formed on the first mirror surface and the second mirror surface, and thus also affect the number of columns of the matrix-shaped light spots.

[0155] In step S830, based on the second predetermined distance interval, a second-direction distance array of curvature centers is constructed for the second curvature center (C 2 ) of the second rectangular concave mirror and the first curvature center (C 1 ) of the first rectangular concave mirror.

[0156] Here, according to the multi-reflection air chamber 400 described above, for the multi-reflection air chamber structure of the first embodiment, the second direction is the horizontal direction. The second-direction distance between the second curvature center C 2 and the first curvature center C 1 can affect the horizontal direction spacing (column spacing) of the matrix-shaped light spots finally formed on the first mirror surface and the second mirror surface, and thus also affect the number of columns of the matrix-shaped light spots.

[0157] For the multi-reflection air chamber structure of the second embodiment, the second direction is the vertical direction. The second-direction distance between the second curvature center C 2 and the first curvature center C 1 can affect the vertical direction spacing (row spacing) of the matrix-shaped light spots finally formed on the first mirror surface and the second mirror surface, and thus also affect the number of rows of the matrix-shaped light spots.

[0158] Next, in step S840, for each first-direction distance value in the first-direction distance array of the curvature center and each second-direction distance in the second-direction distance array of the curvature center, set the light to be incident from a predetermined incident point, and determine the matrix-shaped light spot formed by the light on the first mirror and the second mirror according to the optical model.

[0159] Here, the predetermined incident point can be located on the second rectangular concave mirror of the first mirror or the fifth rectangular concave mirror of the second mirror.

[0160] Next, in step S850, select the matrix-shaped light spots whose number of rows (m) is within a predetermined range of the number of rows and the number of columns (n) is within a predetermined range of the number of columns as candidate matrix-shaped light spots, and generate a candidate matrix-shaped light spot set based on all the candidate matrix-shaped light spots.

[0161] Here, the predetermined range of the number of rows and the predetermined range of the number of columns can be determined by those skilled in the art according to the mirror size in actual applications and the conditions of the limited number of light reflections (number of light passes). The present invention does not make specific limitations in this regard. It should be noted that the number of reflections is related to the number of light spots (number of rows and columns) included in the matrix-shaped light spot. The settings of the predetermined range of the number of rows and the predetermined range of the number of columns need to ensure that the matrix-shaped light spots finally formed on the mirror do not overlap and ensure that the number of reflections meets the predetermined number of reflection conditions.

[0162] Finally, in step S860, determine the optical path corresponding to each candidate matrix-shaped light spot in the candidate matrix-shaped light spot set according to the optical model, so as to select the optimal matrix-shaped light spot that meets the fixed optical path conditions.

[0163] It should be noted that the optical path is related to the number of light passes and the distance between the first mirror and the second mirror (curvature radius R), and the number of light passes (pass = 2mn - 1) is related to the number of rows m and the number of columns n of the matrix-shaped light spot. Thus, the optical path corresponding to each candidate matrix-shaped light spot can be determined according to the optical model. Furthermore, select the candidate matrix-shaped light spot that meets the optical path conditions as the optimal matrix-shaped light spot according to the actually required optical path conditions.

[0164] In one embodiment, a predetermined incident angle array including multiple incident angles can be constructed for the incident angle, so as to analyze the influence on the finally formed matrix-shaped light spot by adjusting the incident angle of the light. Specifically, setting the light to be incident from the predetermined incident point in step S840 can be achieved according to the following method: an incident angle array can be constructed based on a predetermined angle interval. Furthermore, for each first-direction distance value in the first-direction distance array of the curvature center and each second-direction distance in the second-direction distance array of the curvature center, set the light to be incident from the predetermined incident point at each incident angle in the incident angle array respectively.

[0165] Further, a predetermined incident point array including multiple predetermined incident points can be constructed for a predetermined incident point to analyze the influence on the finally formed matrix-shaped light spot by adjusting the position of the predetermined incident point. Specifically, a predetermined incident point coordinate array can be constructed based on twice the second predetermined distance interval, and based on each predetermined incident point coordinate in the predetermined incident point coordinate array, it is set that the light ray is incident from the predetermined incident point.

[0166] In one embodiment, the first predetermined distance interval can be set to D 1 / 2, and the second predetermined distance interval can be set to D 2 / 2. Wherein, D 1 represents the first direction pitch of the matrix-shaped light spot, and D 2 represents the second direction pitch of the matrix-shaped light spot.

[0167] Figure 9 FIG. shows a schematic diagram of various matrix-shaped light spot patterns formed on the second mirror surface of the multi-reflection gas chamber according to the first embodiment of the present invention. Among them, the formation order of the matrix-shaped light spots is represented in ascending order of numbers. In the figure, lines represents the number of rows of the matrix-shaped light spot, col represents the number of columns of the matrix-shaped light spot, and pass represents the number of light passes corresponding to the matrix-shaped light spot. The "×" in the figure represents the curvature center of each rectangular concave mirror on the first mirror surface.

[0168] Figure 10 FIG. shows a schematic diagram of various matrix-shaped light spot patterns formed on the second mirror surface of the multi-reflection gas chamber according to the second embodiment of the present invention. Among them, the formation order of the matrix-shaped light spots is represented in ascending order of numbers. In the figure, lines represents the number of rows of the matrix-shaped light spot, col represents the number of columns of the matrix-shaped light spot, and pass represents the number of light passes corresponding to the matrix-shaped light spot. The "×" in the figure represents the curvature center of each rectangular concave mirror on the first mirror surface.

[0169] In one embodiment, for the candidate matrix-shaped light spot set determined by the method 800 according to the present invention and the optical path corresponding to each candidate matrix-shaped light spot, when multiple laser beams need to be injected into the multi-reflection gas chamber to detect multiple gases, a candidate matrix-shaped light spot can be allocated to each laser beam for detecting each gas based on the optical path conditions required for detecting each gas, and the multiple candidate matrix-shaped light spots corresponding to the multiple laser beams do not overlap. According to the optical model, the incident point and incident angle corresponding to the candidate matrix-shaped light spot allocated to each laser beam can be determined, so that each laser beam can be controlled to be incident into the multi-reflection gas chamber from the corresponding incident point at the corresponding incident angle, so as to detect the corresponding gas through each laser beam, thereby realizing the synchronous detection of multiple gases.

[0170] Specifically, based on the coordinates of the incident point, an incident hole is opened at a corresponding position on the first mirror surface (the second rectangular concave mirror) or the second mirror surface (the fifth rectangular concave mirror) of the actual multi-reflection gas chamber, so that each laser beam enters the multi-reflection gas chamber through the corresponding incident hole respectively.

[0171] Figure 11 The figure shows a schematic diagram of a multi-reflection gas chamber (when detecting multiple gases) according to the first embodiment of the present invention, where two sets of matrix-shaped light spots are respectively formed on the two side mirror surfaces. The solid circles in the figure represent the first set of matrix-shaped light spots, and the hollow circles represent the second set of matrix-shaped light spots. In a specific embodiment, the first set of matrix-shaped light spots can be formed by the first laser beam for detecting the first gas, which enters the multi-reflection gas chamber through the incident hole and is reflected multiple times. The second set of matrix-shaped light spots can be formed by the second laser beam for detecting the second gas, which enters the multi-reflection gas chamber through the incident hole and is reflected multiple times.

[0172] As Figure 11 shown, the two sets of matrix-shaped light spots on the first mirror surface 410 and the second mirror surface 420 do not overlap. Two incident holes (in) corresponding to the two sets of matrix-shaped light spots are provided on the second rectangular concave mirror of the first mirror surface 410, and two exit holes (out) corresponding to the two incident holes are provided on the fifth rectangular concave mirror of the second mirror surface 420. Among them, the first laser beam for detecting the first gas can enter through the incident hole corresponding to the first set of matrix-shaped light spots and finally exit through the corresponding exit hole; the second laser beam for detecting the second gas can enter through the incident hole corresponding to the second set of matrix-shaped light spots and finally exit through the corresponding exit hole.

[0173] According to the multi-reflection gas chamber of the present invention and the method for determining the formation of matrix-shaped light spots in the multi-reflection gas chamber, a genetic algorithm is used to determine the structure of the multi-reflection gas chamber suitable for forming matrix-shaped light spots. Among them, according to the multi-reflection gas chamber proposed by the present invention, the two side mirror surfaces are symmetrically arranged, and each side mirror surface respectively includes three mutually spliced rectangular concave mirrors. After the light enters the multi-reflection gas chamber, mutually symmetric matrix-shaped light spots can be formed on the two side mirror surfaces. By forming a matrix-shaped light spot pattern, the mirror surface area of the multi-reflection gas chamber can be fully utilized, the optical path volume ratio is relatively high, and the distance between the two side mirror surfaces is relatively large, which is conducive to achieving a larger optical path with fewer reflection times. In addition, according to the method for determining the formation of matrix-shaped light spots in the multi-reflection gas chamber of the present invention, various matrix-shaped light spot patterns that can be formed in the multi-reflection gas chamber can be determined. In this way, the optimal matrix-shaped light spot pattern can be selected according to the actual optical path conditions required in actual applications.

[0174] In addition, according to the multi-reflection gas chamber of the present invention, by making multiple laser beams incident on the multi-reflection gas chamber to form multiple groups of non-overlapping matrix-shaped light spots, each laser beam is respectively used to detect a gas. In this way, synchronous detection of multiple gases can be achieved in the multi-reflection gas chamber, improving the utilization rate of the multi-reflection gas chamber and the detection efficiency of gases.

[0175] The various technologies described herein can be implemented in combination with hardware or software, or a combination thereof. Thus, the method and device of the present invention, or certain aspects or parts of the method and device of the present invention, may take the form of program code (i.e., instructions) embedded in a tangible medium, such as a removable hard disk, a USB flash drive, a floppy disk, a CD-ROM, or any other machine-readable storage medium. When the program is loaded into a machine such as a computer and executed by the machine, the machine becomes a device for practicing the present invention.

[0176] In the case where the program code is executed on a programmable computer, the computing device generally includes a processor, a processor-readable storage medium (including volatile and non-volatile memories and / or storage elements), at least one input device, and at least one output device. Among them, the memory is configured to store the program code; the processor is configured to execute the data storage method and / or the data query method of the present invention according to the instructions in the program code stored in the memory.

[0177] In the specification provided herein, the algorithms and displays are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used in conjunction with the examples of the present invention. Based on the above description, the structure required to construct such a system is obvious. In addition, the present invention is not directed to any particular programming language. It should be understood that the content of the present invention described herein can be implemented using various programming languages, and the description of a particular language above is for disclosing the best mode of the present invention.

[0178] In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present invention and forms different embodiments. For example, in the following claims, any one of the claimed embodiments can be used in any combination.

[0179] As used herein, unless otherwise specified, the use of ordinal numbers "first", "second", "third", etc. to describe ordinary objects only indicates different instances of similar objects and does not intend to imply that the objects so described must have a given order in terms of time, space, sorting, or any other way.

Claims

1. A multi-reflective air chamber, comprising a first mirror surface and a second mirror surface arranged symmetrically, in: The multi-reflector air chamber is a confocal cavity structure. Under the condition of paraxial approximation, the positions of the continuous images formed by the multi-reflector air chamber meet the following rules: the object point and the image point near the center of curvature are collinear, and the midpoint between the object point and the image point is located at the center of curvature; The first mirror surface and the second mirror surface respectively include a predetermined number of non-overlapping rectangular concave mirrors, wherein the predetermined number K has a value range of K≥3, and K is a positive integer; An incident hole is provided on the first mirror surface or the second mirror surface, and the light incident through the incident hole is suitable for being emitted after multiple reflections between the first mirror surface and the second mirror surface, and is suitable for forming mutually symmetrical matrix-type light spots on the first mirror surface and the second mirror surface.

2. The multi-reverse air chamber according to claim 1, in, The predetermined number is 3; The first mirror surface includes a first rectangular concave mirror, a second rectangular concave mirror, and a third rectangular concave mirror that are spliced together. Among them, the first curvature center (C 1 ) of the first rectangular concave mirror and the third curvature center (C 3 ) of the third concave mirror are collinear; The second mirror surface comprises: a fourth rectangular concave mirror having the same mirror parameters as the first rectangular concave mirror and arranged symmetrically; a fifth rectangular concave mirror, which has the same mirror parameters as the second rectangular concave mirror and is symmetrically arranged; The sixth rectangular concave mirror has the same mirror parameters as the third rectangular concave mirror and is arranged symmetrically.

3. The multi-reverse air chamber as claimed in claim 2, in, The first curvature center (C 1 ) and the third curvature center (C 3 ) are located on a straight line in the first direction; The first-direction pitch of the matrix-shaped light spot is twice the first-direction distance between the first curvature center (C 1 ) and the third curvature center (C 3 ). The second-direction pitch of the matrix-shaped light spot is twice the second-direction distance between the second curvature center (C 2 ) of the second rectangular concave mirror and the first curvature center (C 1 ); The first direction is a vertical direction or a horizontal direction, and the second direction is perpendicular to the first direction.

4. The multi-reverse air chamber as claimed in claim 3, in, When the first direction is the vertical direction, the second direction distance between the second curvature center (C 2 ) and the first curvature center (C 1 ) is: Wherein, L represents the second direction distance between the second curvature center (C 2 ) and the first curvature center (C 1 ), m represents the number of rows of the matrix-shaped light spot, and d l represents the first direction pitch of the matrix-shaped light spot; When the first direction is the horizontal direction, the second-direction distance between the second curvature center (C 2 ) and the first curvature center (C 1 ) is: where L represents the second directional distance between the second curvature center (C 2 ) and the first curvature center (C 1 ), n represents the number of columns of the matrix-shaped light spot, and d c represents the first directional pitch of the matrix-shaped light spot.

5. The multi-reverse air chamber according to any one of claims 1 to 4, in, The first rectangular concave mirror, the second rectangular concave mirror, and the third rectangular concave mirror are sequentially spliced; The height of the first rectangular concave mirror is equal to the sum of the heights of the second rectangular concave mirror and the third rectangular concave mirror, and the lengths of the first rectangular concave mirror, the second rectangular concave mirror and the third rectangular concave mirror are the same; The first curvature center (C 1 ) and the third curvature center (C 3 ) are located on a straight line in the vertical direction.

6. The multi-reverse air chamber according to any one of claims 1 to 4, in, The first rectangular concave mirror is spliced ​​with the second rectangular concave mirror and the third rectangular concave mirror respectively; The length of the first rectangular concave mirror is equal to the sum of the lengths of the second rectangular concave mirror and the third rectangular concave mirror, and the heights of the first rectangular concave mirror, the second rectangular concave mirror and the third rectangular concave mirror are the same; The first curvature center (C 1 ) and the third curvature center (C 3 ) are located on a straight line in the horizontal direction.

7. The multi-reverse air chamber as claimed in claim 5, in, The matrix-type light spot includes a plurality of light spots arranged in m rows and n columns; Wherein, m≥4, m is an even number, and n is a positive integer.

8. The multi-reverse air chamber according to claim 6, in, The matrix-type light spot includes a plurality of light spots arranged in m rows and n columns; Wherein, m≥2, m is an even number, and n is a positive integer.

9. The multi-reverse air chamber according to any one of claims 1 to 4, in, The incident hole is arranged on the second rectangular concave mirror or the fifth rectangular concave mirror.

10. The multi-reverse air chamber according to any one of claims 1 to 4, in, The second rectangular concave mirror and / or the fifth rectangular concave mirror are provided with a plurality of incident holes; The multi-reflector chamber is suitable for injecting multiple laser beams, and each laser beam is suitable for detecting a gas; Among them, multiple laser beams are adapted to enter through multiple incident holes, reflect multiple times between the first mirror surface and the second mirror surface, and then exit, and are adapted to form multiple groups of non-overlapping matrix-shaped light spots on the first mirror surface and the second mirror surface.

11. The multi-reflection gas chamber according to claim 1, wherein, the predetermined quantity is 4; the first mirror surface includes a first rectangular concave mirror, a second rectangular concave mirror, a third rectangular concave mirror, and a fourth rectangular concave mirror that are spliced together. Among them, the second curvature center of the second rectangular concave mirror and the fourth curvature center of the fourth concave mirror are collinear in the vertical direction, and the first curvature center of the first rectangular concave mirror and the fourth curvature center of the fourth concave mirror are collinear in the horizontal direction; the second mirror surface includes: a fifth rectangular concave mirror, having the same mirror surface parameters as the first rectangular concave mirror and arranged symmetrically; a sixth rectangular concave mirror, having the same mirror surface parameters as the second rectangular concave mirror and arranged symmetrically; a seventh rectangular concave mirror, having the same mirror surface parameters as the third rectangular concave mirror and arranged symmetrically; an eighth rectangular concave mirror, having the same mirror surface parameters as the fourth rectangular concave mirror and arranged symmetrically.

12. The multi-reflection gas chamber according to any one of claims 1-4, wherein, the rectangular concave mirror is a rectangular concave spherical mirror, and the curvature radius of each rectangular concave mirror is the same, and the curvature radius is equal to the distance between the first mirror surface and the second mirror surface.

13. The multi-reflection gas chamber according to any one of claims 1-4, wherein, the mirror surface parameters of the first mirror surface and the second mirror surface are adapted to be determined by using a genetic algorithm; wherein, the mirror surface parameters include the curvature center positions and sizes of each rectangular concave mirror included in the first mirror surface and the second mirror surface.

14. The multi-reflection gas chamber according to claim 13, wherein, the mirror surface parameters of the first mirror surface and the second mirror surface are adapted to be determined according to the following steps: Randomly generate multiple matrix-shaped light spot formation order individuals as the initial population; Perform one or more iterations based on the initial population to obtain one or more generations of populations; Calculate the number of curvature centers corresponding to each matrix-shaped light spot formation order individual in each generation of population to determine the target matrix-shaped light spot formation order corresponding to the number of curvature centers being the predetermined quantity; Based on the target matrix-shaped light spot formation order, determine the mirror surface parameters of the first mirror surface and the second mirror surface.

15. The multi-reflection gas chamber according to claim 14, wherein, the mirror surface parameters of the first mirror surface and the second mirror surface are further adapted to be determined according to the following steps: Take the target matrix-shaped light spot formation order as the matrix-shaped light spot formation order of the second mirror surface, and take the reversed target matrix-shaped light spot formation order as the matrix-shaped light spot formation order of the first mirror surface; Based on the matrix-shaped light spot formation orders of the first mirror surface and the second mirror surface, determine whether the first mirror surface and the second mirror surface can be respectively divided into a predetermined number of non-overlapping rectangular concave mirrors; If so, determine the mirror surface parameters and sizes of each rectangular concave mirror included in the first mirror surface and the second mirror surface.

16. The multi-reflection gas chamber according to claim 15, wherein, Determining whether the first mirror and the second mirror can be respectively divided into a predetermined number of non-overlapping rectangular concave mirrors includes: Based on the matrix spot formation sequence of the first mirror and the second mirror, determining the mirror positions of each spot in the matrix spot; Based on the mirror positions of each spot, determining whether the first mirror and the second mirror can be respectively divided into a predetermined number of non-overlapping rectangular concave mirrors.

17. The multi-reflection air chamber according to claim 14, wherein, Calculating the number of curvature centers corresponding to each individual of the matrix spot formation sequence in each generation of the population to determine the target matrix spot formation sequence corresponding to the number of curvature centers being the predetermined number includes: Calculating the number of curvature centers corresponding to each individual in each generation of the population, and determining whether the number of curvature centers is the predetermined number; If the number of curvature centers is the predetermined number, determining the matrix spot formation sequence corresponding to the individual corresponding to the absolute value of the difference between the number of curvature centers and the predetermined number as the target matrix spot formation sequence; If the number of curvature centers is not the predetermined number, then: Performing crossover and mutation operations on the population to obtain the next generation of the population; Calculating the number of curvature centers corresponding to each individual in the next generation of the population, and determining whether the number of curvature centers is the predetermined number; Until it is determined that the number of curvature centers is the predetermined number, determining the matrix spot formation sequence corresponding to the individual with the number of curvature centers being the predetermined number as the target matrix spot formation sequence.

18. A method for determining the formation of a matrix spot in a multi-reflection air chamber, which is executed in a computing device, the multi-reflection air chamber being the multi-reflection air chamber according to any one of claims 1-17, the method comprising the steps of: Establishing an optical model of the multi-reflection air chamber based on the mirror parameters of the first mirror and the second mirror of the multi-reflection air chamber; Based on the first predetermined distance interval, for the first direction distance between the first center of curvature (C 1 ) of the first rectangular concave mirror and the third center of curvature (C 3 ) of the third rectangular concave mirror, construct the first direction distance array of the centers of curvature; Based on the second predetermined distance interval, for the second direction distance between the second center of curvature (C 2 ) of the second rectangular concave mirror and the first center of curvature (C 1 ) of the first rectangular concave mirror, construct an array of the second direction distances of the centers of curvature; For each first-direction distance value in the first-direction distance array of the curvature centers and each second-direction distance in the second-direction distance array of the curvature centers, setting the light to be incident from a predetermined incident point, and determining the matrix spot formed by the light on the first mirror and the second mirror according to the optical model; Selecting the matrix spots whose number of rows is within a predetermined range of the number of rows and the number of columns is within a predetermined range of the number of columns as candidate matrix spots, and generating a candidate matrix spot set based on all the candidate matrix spots; and Determining the optical path corresponding to each candidate matrix spot according to the optical model, so as to select the candidate matrix spot that meets the fixed optical path condition as the optimal matrix spot.

19. The method according to claim 18, wherein, The step of setting the light to be incident from a predetermined incident point includes: Constructing an incident angle array based on a predetermined angular interval; Setting the light to be incident from the predetermined incident point at each incident angle in the incident angle array respectively.

20. The method according to claim 18 or 19, wherein, The predetermined incident point is located on the second rectangular concave mirror or the fifth rectangular concave mirror; The step of setting the light to be incident from a predetermined incident point includes: Constructing a predetermined incident point coordinate array based on twice the second predetermined distance interval. Based on each predetermined incident point coordinate in the array of predetermined incident point coordinates, set the light to be incident from the predetermined incident point.

21. The method according to claim 18 or 19, wherein, The first predetermined distance interval is D 1 / 2, The second predetermined distance interval is D 2 / 2, Among them, D 1 represents the first-direction pitch of the matrix-shaped light spot, and D 2 represents the second-direction pitch of the matrix-shaped light spot.

22. A computing device, comprising: at least one processor; and a memory storing program instructions, wherein the program instructions are configured to be executed by the at least one processor, and the program instructions include instructions for executing the method according to any one of claims 18-21.

23. A readable storage medium storing program instructions, which when read and executed by a computing device, cause the computing device to execute the method according to any one of claims 18-21.

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