Multiple-pass back-reflection sample cell and method of operation thereof

Abstract

The application belongs to the technical field of detection, and particularly relates to a multiple back-and-forth reflection sample cell and a working method thereof. The multiple back-and-forth reflection sample cell comprises a main chamber and a secondary chamber, the secondary chamber is provided with an air inlet and an air outlet group which are in communication with the main chamber; an adjusting mechanism is located in the secondary chamber and is suitable for adjusting the size of the air outlet group according to the air pressure in the secondary chamber; an air charging assembly is connected with the air inlet pipe of the main chamber; a solenoid valve is connected with the air outlet pipe of the main chamber; a detection module; a control module is electrically connected with the air charging assembly, the solenoid valve and the detection module. The multiple back-and-forth reflection sample cell charges the medium in the main chamber with an excessive volume at a constant speed through the air charging assembly, and then discharges the medium with an excessive volume by opening the solenoid valve, so that the medium in the secondary chamber disturbs the medium in the main chamber due to the pressure difference during the discharging process.

Description

Technical Field

[0001] The present invention belongs to the field of detection technology, and specifically relates to testing or analyzing materials by means of measuring the chemical or physical properties of the materials, and more particularly relates to a multiple-return reflection sample cell and a working method thereof. Background Art

[0002] The concentration of the medium can be detected by repeatedly reflecting the sample cell back and forth. The specific method is to inject the medium into a chamber at a constant speed and constant amount, and then emit a laser into the chamber through a laser transmitter. After the light passes through the medium in the chamber, it is received by a receiver. The transmittance of the chamber is judged according to the intensity of the received light, and then the concentration of the medium in the chamber is calculated.

[0003] In related art, in order to make the medium in the chamber evenly distributed, a turbulence device is generally provided in the chamber, for example, by blowing turbulence to the medium in the chamber, so as to make the medium evenly distributed.

[0004] However, during the implementation of the above scheme, due to the different concentrations of the medium, the requirements for the disturbance intensity are also different, which may lead to insufficient or excessive disturbance, making it impossible to evenly distribute the medium, thereby affecting the detection accuracy.

[0005] Therefore, how to solve the technical problem of insufficient or excessive disturbance caused by the existing built-in fixed-intensity disturbance source is urgently needed to be solved by those skilled in the art.

[0006] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the Invention

[0007] The embodiments of the present disclosure at least provide a multiple round-trip reflection sample cell and a working method thereof.

[0008] In a first aspect, embodiments of the present disclosure provide a multi-reciprocating reflectance sample cell, comprising: a detection chamber comprising: a main chamber and a sub-chamber, the sub-chamber having an air inlet and an air outlet group communicating with the main chamber; a regulating mechanism located within the sub-chamber; an air filling assembly connected to the air inlet pipe of the main chamber; a solenoid valve connected to the air outlet pipe of the main chamber; a detection module; and a control module electrically connected to the air filling assembly, the solenoid valve, and the detection module. The control module is configured to control the air filling assembly to constantly fill an excess volume of medium into the main chamber, and then control the solenoid valve to open the air outlet pipe to gradually discharge the excess volume of medium. The control module is further configured to control the detection module to detect the transmittance of the main chamber after the main chamber is evacuated. During the evacuation of the main chamber, the pressure differential in the sub-chamber turbules the medium in the main chamber to evenly distribute the medium. Simultaneously, the regulating mechanism adjusts the size of the air outlet group in response to a decrease in air pressure within the sub-chamber to gradually reduce the intensity of the turbulence.

[0009] In an optional embodiment, the adjustment mechanism includes: a baffle and an elastic component; wherein one end of the elastic component is connected to the inner wall of the sub-chamber, and the other end is connected to the baffle, and a avoidance hole group is provided on the baffle; during the inflation process of the main chamber, the elastic component retreats a corresponding distance according to the air pressure intensity in the sub-chamber, so that the avoidance hole group and the air outlet group overlap with an area of ​​corresponding size; during the exhaust process of the main chamber, the elastic component gradually resets according to the air pressure intensity in the sub-chamber to close the air outlet group, that is, gradually reduces the turbulence intensity.

[0010] In an optional embodiment, the elastic component includes: a spring and a slider; wherein the baffle is slidably arranged in the middle of the sub-chamber, and the slider is slidably arranged at one end of the sub-chamber; one side of the slider is connected to the inner wall of the sub-chamber through a spring, and the other side is connected to the baffle; wherein the slider is suitable for sliding according to the air pressure intensity in the sub-chamber to drive the baffle to adjust the size of the air outlet group.

[0011] In an optional embodiment, the air inlet is opened at the other end of the sub-chamber, and the air outlet group is opened in the middle of the sub-chamber.

[0012] In a second aspect, the disclosed embodiment also provides a method for operating a multiple-round-trip reflection sample pool, including: controlling the inflation assembly through the control module to constantly fill an excess volume of medium into the main chamber, so that the regulating mechanism in the sub-chamber opens the air outlet group; controlling the solenoid valve through the control module to discharge the excess volume of medium from the main chamber; wherein, during the exhaust process of the main chamber, the sub-chamber disturbs the medium in the main chamber due to the pressure difference, and at the same time, the regulating mechanism gradually closes the air outlet group due to the pressure difference to gradually reduce the disturbance intensity.

[0013] In an alternative embodiment, the method of opening the outlet group by the adjusting mechanism through the pressure difference in the auxiliary chamber includes: the auxiliary chamber receives the medium in the main chamber through the inlet until the pressure is balanced; and the adjusting mechanism opens the outlet group according to the pressure in the auxiliary chamber to adjust the turbulence intensity in the initial state.

[0014] In an alternative embodiment, the method of opening the outlet group by the adjusting mechanism through the pressure difference in the auxiliary chamber includes: the pressure in the auxiliary chamber changes according to the medium; and the adjusting mechanism opens the outlet group according to the size of the pressure in the auxiliary chamber to adjust the turbulence intensity in the initial state.

[0015] In an alternative embodiment, the method of discharging the excess volume of medium from the main chamber by the control module controlling the electromagnetic valve includes: after the pressure in the main chamber and the auxiliary chamber is balanced, the control module controls the electromagnetic valve to open to discharge the excess volume of medium from the main chamber; and wherein the volume data of the medium discharged by the electromagnetic valve is obtained by the flow sensor and sent to the control module.

[0016] In an alternative embodiment, the method of the auxiliary chamber disturbing the medium in the main chamber due to the pressure difference during the exhaust process of the main chamber includes: the pressure difference between the main chamber and the auxiliary chamber is formed by the exhaust of the main chamber; and the auxiliary chamber sprays the medium to the main chamber through the outlet group to disturb the medium due to the pressure difference.

[0017] In an alternative embodiment, the method of the adjusting mechanism gradually closing the outlet group due to the pressure difference to gradually reduce the turbulence intensity includes: the auxiliary chamber gradually reduces the pressure by spraying the medium to the main chamber; and the adjusting mechanism gradually closes the outlet group according to the reduction of the pressure in the auxiliary chamber, i.e. gradually reduces the turbulence intensity.

[0018] The beneficial effects of the present application are that the multiple back-and-forth reflection sample cell and its working method can charge the excess volume of medium into the main chamber through the inflation assembly, and then discharge the excess volume of medium by opening the electromagnetic valve, so that during the exhaust process, the medium in the auxiliary chamber disturbs the medium in the main chamber due to the pressure difference; at the same time, the adjusting mechanism gradually closes the outlet group to reduce the turbulence intensity, so as to prevent the high-intensity turbulence in the late turbulence from causing uneven medium; and the adjusting mechanism adjusts the size of the initial outlet group according to the different concentrations of the medium, so as to realize different initial turbulence intensities.

[0019] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and attained by the structure particularly pointed out in the description and the drawings.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited herein and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of a detection chamber provided in an embodiment of the present disclosure;

[0023] Figure 2 A schematic structural diagram of a multiple-round-trip reflection sample cell provided in an embodiment of the present disclosure;

[0024] Figure 3 A schematic diagram of a cross-sectional structure of a detection chamber provided by an embodiment of the present disclosure when not inflated;

[0025] Figure 4 A schematic diagram of the cross-sectional structure of a detection chamber after inflation provided by an embodiment of the present disclosure.

[0026] In the picture:

[0027] Detection chamber 1, main chamber 11, sub-chamber 12, air inlet 13, air outlet group 14;

[0028] Adjustment mechanism 3, baffle 31, avoidance hole group 311, elastic component 32, spring 321, slider 322;

[0029] Shell 4, air inlet pipe 41, air outlet pipe 42. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] As the primary application area for multi-pass reflection cells, they are typically configured to measure gas concentrations, such as petroleum gas (shale gas, coal-rock gas, natural gas, and gas while drilling) or polluted air. The current measured concentration is determined by changes in the refractive index of light. Since multi-pass reflection cells are static, ensuring the uniformity of gas concentration distribution within the cell is crucial for accurate measurement results. This is because different gas components may stratify or have varying concentrations in different areas. Gas mixtures with large density differences can be particularly uneven. To address this, conventional techniques incorporate a disturbance device within the cell to help evenly distribute the gas within the cell, avoiding localized concentration differences caused by gas settling or stagnant flow. Furthermore, because the interaction forces between molecules of the same gas vary under different concentration conditions, concentrated gases have denser molecules, resulting in lower kinetic energy. This means they may respond more slowly to disturbances, necessitating a larger disturbance to ensure uniform distribution. Low-concentration gases have lower density and greater spacing between molecules, making them more mobile. Small disturbances may cause rapid diffusion of these gas molecules, thus affecting the uniformity of the gas in the sample pool. However, since the staff cannot know the gas concentration data in advance before the test,

[0032] In other words, the disturbance intensity cannot be adjusted by the gas concentration state, and can only be set to a fixed disturbance intensity. This means that if the current gas concentration is low, still applying disturbance will cause the gas to produce a local temperature gradient or reactivity difference.

[0033] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. In addition, in the drawings, the thickness of components may be exaggerated or reduced in order to effectively describe the technical content.

[0034] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0035] like Figures 1 to 4 As shown, at least one embodiment provides a multiple round-trip reflection sample cell, including: a detection chamber 1, an inflation component, a solenoid valve, a detection module and a control module, and the control module is electrically connected to the detection module, the solenoid valve and the inflation component.

[0036] like Figure 3 As shown, in some embodiments, the detection chamber 1 includes: a main chamber 11 and a sub-chamber 12 , and the sub-chamber 12 is provided with an air inlet 13 and an air outlet group 14 communicating with the main chamber 11 .

[0037] like Figure 1 、 Figure 2 As shown, in some embodiments, the detection chamber 1 is installed in a shell 4, the main chamber 11 is connected to an air inlet pipe 41 and an air outlet pipe 42, the inflation component is connected to the air inlet pipe 41, and the solenoid valve is set on the air outlet pipe 42.

[0038] In this embodiment, the control module controls the inflation component to fill the main chamber 11 with an excess volume of medium. During the inflation process, the medium in the main chamber 11 will enter the sub-chamber 12 through the air inlet 13 until the pressure in the main chamber 11 and the sub-chamber 12 is balanced; when the inflation component is completed, the control module controls the solenoid valve to open the air outlet pipe 42 to discharge the excess volume of medium in the main chamber 11; wherein, a flow sensor is provided in the air outlet pipe 42, and the flow sensor is used to obtain volume data of the discharged medium and send it to the control module.

[0039] Also, during the exhaust process of the main chamber 11, since it is the main chamber 11 that is exhausting, the air pressure in the main chamber 11 will decrease before that of the sub-chamber 12. Therefore, the medium in the sub-chamber 12 will rush into the main chamber 11 due to the pressure difference, thereby achieving a turbulent flow effect on the medium in the main chamber 11, making the medium in the main chamber 11 more evenly distributed; at the same time, since the medium in the sub-chamber 12 is replenished into the main chamber 11, the air pressure in the sub-chamber 12 will gradually decrease. At this time, the regulating mechanism 3 will gradually reset, thereby gradually closing the opened air outlet group 14, that is, gradually reducing the turbulence intensity. Among them, as the turbulence proceeds, the medium in the main chamber 11 will gradually be evenly distributed, and the gradual reduction in turbulence intensity can avoid the medium in the main chamber 11 becoming uneven again due to excessive turbulence in the later stage of turbulence.

[0040] In some embodiments, the regulating mechanism 3 is disposed in the sub-chamber 12 , and the regulating mechanism 3 can open the air outlet group 14 of corresponding size according to the air pressure in the sub-chamber 12 .

[0041] In this embodiment, after the main chamber 11 is filled with the medium, the pressure of the sub-chamber 12 will also increase due to the air inlet 13 receiving the medium, thereby pushing the regulating mechanism 3 to open the air outlet group 14; wherein, the air pressure in the sub-chamber 12 will change according to the different mediums filled, and different media have different concentrations. When the volume of the filled medium is fixed, the greater the concentration of the medium, the greater the air pressure in the sub-chamber 12, the greater the distance the regulating mechanism 3 retreats, the greater the opening of the air outlet group 14, that is, the intensity of the initial turbulence is also greater. Conversely, the smaller the concentration of the medium, the smaller the air pressure in the sub-chamber 12, the smaller the distance the regulating mechanism 3 retreats, the smaller the opening of the air outlet group 14, that is, the intensity of the initial turbulence is also smaller.

[0042] In this embodiment, the adjustment mechanism 3 is provided to adjust the intensity of the initial disturbance flow according to the concentration of the medium, thereby preventing low-concentration medium from being unevenly distributed due to high-intensity disturbance flow, and also preventing high-concentration medium from being unevenly distributed due to low-intensity disturbance flow.

[0043] In some embodiments, the inflation component may be, but is not limited to, an air pump (not shown in the figure), and a flow meter may be configured to control the volume of the medium filled into the main chamber 11 .

[0044] In an optional embodiment, the volume of the detection chamber 1 is 2 liters, the preset volume of the medium filled is 3 liters, the volume of the medium filled into the main chamber 11 by the inflation component is 5 liters, and the volume of the medium discharged by the solenoid valve is 2 liters.

[0045] In some embodiments, the control module may be but is not limited to using a PLC; the control module is configured to control the detection module to detect the transmittance of the main chamber 11 after the main chamber 11 is exhausted (ie, the turbulence is completed).

[0046] In this embodiment, the transmittance of the main chamber 11 is detected immediately after the turbulence ends to avoid the medium becoming uneven again due to standing still, thereby affecting the detection accuracy; optionally, the detection module is implemented using existing technology, for example, it may include: a transmitting source and a receiving source, the control module controls the transmitting source to emit a beam of light of known intensity to the main chamber 11, the receiving source is used to receive and obtain the intensity data of the light, and the control module obtains the transmittance through the difference in the intensity of the transmitted and received light.

[0047] like Figure 3 As shown, in some embodiments, the adjustment mechanism 3 includes: a baffle 31 and an elastic component 32; one end of the elastic component 32 is connected to the inner wall of the sub-chamber 12, and the other end is connected to the baffle 31, and an avoidance hole group 311 is opened on the baffle 31.

[0048] In this embodiment, during the inflation process of the main chamber 11, the elastic component 32 retreats as the air pressure in the sub-chamber 12 increases. When the pressures in the sub-chamber 12 and the main chamber 11 are balanced (i.e., after inflation is completed), the elastic component 32 retreats a corresponding distance according to the air pressure intensity in the sub-chamber 12, so that the avoidance hole group 311 and the air outlet group 14 overlap with an area of ​​corresponding size (the greater the air pressure intensity in the sub-chamber 12, the greater the retreat distance of the elastic component 32, the larger the overlapping area between the avoidance hole group 311 and the air outlet group 14, that is, the larger the air outlet group 14); during the exhaust process of the main chamber 11, the air pressure intensity in the sub-chamber 12 gradually decreases, the elastic component 32 gradually resets, and the air outlet group 14 gradually closes, that is, the turbulence intensity gradually decreases.

[0049] Specifically, such as Figure 4As shown, the elastic component 32 includes: a spring 321 and a slider 322; wherein the baffle 31 is slidably set in the middle of the sub-chamber 12, and the slider 322 is slidably set at one end of the sub-chamber 12; one side of the slider 322 is connected to the inner wall of the sub-chamber 12 through the spring 321, and the other side is connected to the baffle 31; wherein the slider 322 is suitable for sliding according to the air pressure intensity in the sub-chamber 12 to drive the baffle 31 to adjust the size of the air outlet group 14.

[0050] In this embodiment, the slider 322 is slidably arranged in the sub-chamber 12. When the air pressure intensity in the sub-chamber 12 increases, the slider 322 is forced to retreat to squeeze the spring 321; wherein, the distance that the slider 322 drives the baffle 31 to retreat is related to the air pressure intensity in the sub-chamber 12. When the air pressure intensity in the sub-chamber 12 is high, the distance that the slider 322 is forced to retreat is also large, the distance that the slider 322 drives the baffle 31 to retreat is also large, the area of ​​the region where the avoidance hole group 311 overlaps with the air outlet group 14 is also large, and the initial turbulence intensity is also large.

[0051] In some embodiments, the air inlet 13 is opened at the other end of the sub-chamber 12 , the air inlet 13 and the slider 322 are respectively located at two ends of the sub-chamber 12 , and the air outlet group 14 is opened in the middle of the sub-chamber 12 .

[0052] In this embodiment, the air outlet group 14 is located between the air inlet 13 and the slider 322; when the main chamber 11 is not inflated, the spring 321 pushes the slider 322 to move, so that the avoidance hole group 311 on the baffle 31 is misaligned with the air outlet group 14 to close the air outlet group 14; when the main chamber 11 is inflated, the medium will enter the sub-chamber 12 from the air inlet 13, thereby increasing the air pressure in the sub-chamber 12, causing the slider 322 to be forced to retreat, that is, the avoidance hole group 311 on the baffle 31 coincides with the air outlet group 14 to open the air outlet group 14.

[0053] At least one embodiment provides a working method for a multiple-round-trip reflection sample pool, comprising: controlling the inflation component through a control module to fill an excess volume of medium into the main chamber 11, so that the regulating mechanism 3 in the sub-chamber 12 opens the air outlet group 14; controlling the inflation component through the control module to discharge the excess volume of medium from the main chamber 11; wherein, during the exhaust process of the main chamber 11, the sub-chamber 12 disturbs the flow of the medium in the main chamber 11 due to the pressure difference, and at the same time, the regulating mechanism 3 gradually closes the air outlet group 14 due to the pressure difference to gradually reduce the intensity of the disturbance.

[0054] In the present embodiment, during the process of exhausting the main chamber 11, the air pressure in the main chamber 11 is smaller than that in the auxiliary chamber 12, and at this time, the medium in the auxiliary chamber 12 is supplemented into the main chamber 11 due to the pressure difference, thereby achieving the turbulence effect and making the medium in the main chamber 11 more evenly distributed. At the same time, since the medium in the auxiliary chamber 12 is supplemented into the main chamber 11, the air pressure in the auxiliary chamber 12 gradually decreases, and at this time, the adjusting mechanism 3 gradually resets, thereby gradually closing the opened air outlet group 14, i.e., gradually reducing the turbulence intensity. In this way, the medium is gradually and evenly distributed, and the gradually reduced turbulence intensity can avoid the medium from becoming uneven again due to excessive turbulence in the later stage.

[0055] In some embodiments, the method for opening the air outlet group 14 of the adjusting mechanism 3 in the auxiliary chamber 12 by controlling the inflation assembly to inflate the main chamber 11 with an excess volume of medium by the control module includes: controlling the inflation assembly to inflate the main chamber 11 with an excess volume of medium by the control module; the auxiliary chamber 12 receives the medium in the main chamber 11 through the air inlet 13 until the pressure is balanced; and the adjusting mechanism 3 opens the air outlet group 14 by increasing the air pressure in the auxiliary chamber 12.

[0056] In some embodiments, the method for opening the air outlet group 14 of the adjusting mechanism 3 by increasing the air pressure in the auxiliary chamber 12 includes: the air pressure in the auxiliary chamber 12 changes according to different media; and the adjusting mechanism 3 opens the air outlet group 14 of a corresponding size according to the size of the air pressure in the auxiliary chamber 12 to adjust the turbulence intensity in the initial state.

[0057] In the present embodiment, the air pressure in the auxiliary chamber 12 changes according to different media, and different media have different concentrations. When the concentration of the inflated medium is large, the air pressure in the auxiliary chamber 12 is also large, the adjusting mechanism 3 retreats a greater distance, and the air outlet group 14 is opened larger, i.e., the initial turbulence intensity is also larger. Conversely, when the concentration of the inflated medium is small, the air pressure in the auxiliary chamber 12 is also small, the adjusting mechanism 3 retreats a smaller distance, and the air outlet group 14 is opened smaller, i.e., the initial turbulence intensity is also smaller. The present embodiment can adjust the initial turbulence intensity according to the concentration of the medium by setting the adjusting mechanism 3, thereby preventing the low-concentration medium from being subjected to a large turbulence intensity and causing uneven distribution, and preventing the high-concentration medium from being subjected to a small turbulence intensity and causing uneven distribution.

[0058] In some embodiments, the method for controlling the inflation assembly to exhaust an excess volume of medium from the main chamber 11 by the control module includes: after the pressure in the main chamber 11 and the auxiliary chamber 12 is balanced, controlling the inflation assembly to exhaust an excess volume of medium from the main chamber 11 by the control module; and obtaining the volume of the medium exhausted from the inflation assembly by the flow sensor and sending it.

[0059] In some embodiments, the method that the secondary chamber 12 disturbs the medium in the primary chamber 11 due to the pressure difference during the exhaust of the primary chamber 11 includes: forming a pressure difference between the primary chamber 11 and the secondary chamber 12 by the exhaust of the primary chamber 11; and the secondary chamber 12 sprays the medium into the primary chamber 11 through the gas outlet group 14 on it due to the pressure difference to disturb the medium.

[0060] In some embodiments, the method that the adjusting mechanism 3 gradually closes the gas outlet group 14 due to the pressure difference to gradually reduce the disturbance intensity includes: the secondary chamber 12 gradually reduces the air pressure by spraying the medium into the primary chamber 11; and the adjusting mechanism 3 gradually closes the gas outlet group 14 according to the reduction of the air pressure in the secondary chamber 12, that is, gradually reduces the disturbance intensity.

[0061] In summary, the multi-oscillating reflection sample cell and the working method thereof can realize that the medium in the secondary chamber 12 disturbs the medium in the primary chamber 11 due to the pressure difference during the exhaust of the primary chamber 11 by the constant-speed filling of the excess volume of the medium into the primary chamber 11 through the inflation assembly and then the discharge of the excess volume of the medium through the opening of the electromagnetic valve; at the same time, the adjusting mechanism 3 gradually closes the gas outlet group 14 to reduce the disturbance intensity, so as to prevent the high-intensity disturbance in the late stage from causing the non-uniformity of the medium; and the adjusting mechanism 3 adjusts the size of the initial gas outlet group 14 due to the different concentrations of the medium, so as to realize the different initial disturbance intensities.

[0062] In this document, when a first element is referred to as being “on” a second element, it can be directly on the second element or a third element can be interposed therebetween.

[0063] In this document, when an element or layer is referred to as being “on”, “engaged to”, “connected to”, “attached to”, or “coupled to” another element or layer, it can be directly on, engaged, connected, attached, or coupled to the other element or layer, or one or more intervening elements or layers can be present. In contrast, when an element is referred to as being “directly on”, “directly engaged to”, “directly connected to”, “directly attached to”, or “directly coupled to” another element or layer, then there are no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between”, “adjacent” versus “directly adjacent”, etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0064] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." when following a list of elements modify the entire list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0065] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limiting. As used herein, the singular articles "a", "an" and "the" may also be intended to include plural forms, unless otherwise clearly indicated herein. The terms "comprise", "include" and "have" are inclusive and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the particular order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0066] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Thus, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Instead, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0067] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0068] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used herein unless expressly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.

[0069] Spatially relative terms, such as "inside," "outside," "below," "beneath," "down," "above," "on," etc., may be used herein to describe the relationship of one element or feature to another element or feature as illustrated in the figures. In addition to the orientations depicted in the figures, spatially relative terms may be intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as being "below" or "below" other elements or features will be oriented to be "above" the other elements or features. Thus, the example term "below" may encompass both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0070] In the above discussion, unless otherwise indicated, the terms "about," "approximately," "substantially," etc., when used to describe a numerical value, mean a variation of + / - 10% of the value.

[0071] With the above-described preferred embodiments of the present invention as inspiration, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A multiple-return reflection sample cell, characterized in that: include: A detection chamber (1) comprising: a main chamber (11) and a sub-chamber (12), wherein the sub-chamber (12) is provided with an air inlet (13) and an air outlet group (14) communicating with the main chamber (11); An adjusting mechanism (3) is located in the secondary chamber (12); An air filling assembly connected to the air inlet pipe (41) of the main chamber (11); a solenoid valve connected to an air outlet pipe (42) of the main chamber (11); Detection module; a control module electrically connected to the inflation component, the solenoid valve, and the detection module, wherein the control module is configured to control the inflation component to constantly fill an excess volume of medium into the main chamber (11), and then control the solenoid valve to open the air outlet pipe (42) to gradually discharge the excess volume of medium, and the control module is further configured to control the detection module to detect the transmittance of the main chamber (11) after the main chamber (11) is exhausted; In the exhaust process of the main chamber (11), the secondary chamber (12) disturbs the medium in the main chamber (11) due to the pressure difference so that the medium is evenly distributed. At the same time, the regulating mechanism (3) adjusts the size of the air outlet group (14) according to the reduction of the air pressure in the secondary chamber (12) to gradually reduce the intensity of the disturbance.

2. The multiple round-trip reflection sample cell according to claim 1, characterized in that: The regulating mechanism (3) comprises: a baffle (31) and an elastic component (32); wherein One end of the elastic component (32) is connected to the inner wall of the sub-chamber (12), and the other end is connected to the baffle (31), and the baffle (31) is provided with an avoidance hole group (311); During the inflation process of the main chamber (11), the elastic component (32) retreats a corresponding distance according to the air pressure intensity in the secondary chamber (12), so that the avoidance hole group (311) and the air outlet group (14) overlap an area of ​​corresponding size; During the exhaust process of the main chamber (11), the elastic component (32) gradually resets according to the air pressure intensity in the secondary chamber (12) to close the air outlet group (14), that is, gradually reduces the turbulence intensity.

3. The multiple round-trip reflection sample cell according to claim 2, characterized in that: The elastic component (32) includes a spring (321) and a slider (322); wherein The baffle (31) is slidably disposed in the middle of the auxiliary chamber (12), and the slider (322) is slidably disposed at one end of the auxiliary chamber (12); One side of the slider (322) is connected to the inner wall of the sub-chamber (12) via a spring (321), and the other side is connected to the baffle (31); The slider (322) is adapted to slide according to the air pressure intensity in the sub-chamber (12) to drive the baffle (31) to adjust the size of the air outlet group (14).

4. The multiple round-trip reflection sample cell according to claim 3, wherein: The air inlet (13) is opened at the other end of the sub-chamber (12), and the air outlet group (14) is opened in the middle of the sub-chamber (12).

5. A method for operating a multiple-return reflection sample cell according to any one of claims 1 to 4, characterized in that: include: The control module controls the inflation assembly to constantly fill the main chamber (11) with an excess volume of medium, so that the regulating mechanism (3) in the secondary chamber (12) opens the air outlet group (14); The solenoid valve is controlled by the control module to discharge the excess volume of the medium from the main chamber (11); During the exhaust process of the main chamber (11), the secondary chamber (12) disturbs the medium in the main chamber (11) due to the pressure difference, and the regulating mechanism (3) gradually closes the air outlet group (14) due to the pressure difference to gradually reduce the intensity of the disturbance.

6. The method for operating a multiple-return reflection sample cell according to claim 5, wherein: The method of controlling the inflation assembly to constantly fill an excess volume of medium into the main chamber (11) through a control module so as to open the air outlet group (14) by the regulating mechanism (3) in the secondary chamber (12) comprises: Controlling the inflation component to fill an excess volume of medium into the main chamber (11) through the control module; The secondary chamber (12) receives the medium in the main chamber (11) through the air inlet (13) thereon until the pressure is balanced; The regulating mechanism (3) opens the air outlet group (14) by increasing the air pressure in the sub-chamber (12).

7. The method for operating a multiple-return reflection sample cell according to claim 6, wherein: The method in which the regulating mechanism (3) opens the air outlet group (14) by increasing the air pressure in the sub-chamber (12) includes: The air pressure in the sub-chamber (12) changes according to the medium; The regulating mechanism (3) opens the air outlet group (14) of corresponding size according to the air pressure in the sub-chamber (12) to adjust the turbulence intensity in the initial state.

8. The method for operating a multiple-return reflection sample cell according to claim 7, wherein: The method of controlling the solenoid valve by the control module to discharge the excess volume of the medium from the main chamber (11) comprises: After the pressures in the main chamber (11) and the auxiliary chamber (12) are balanced, the control module controls the solenoid valve to open so that the main chamber (11) discharges the excess volume of the medium; The volume data of the medium discharged by the solenoid valve is obtained through the flow sensor and sent to the control module.

9. The method for operating a multiple-return reflection sample cell according to claim 8, wherein: The method for disturbing the flow of the medium in the main chamber (11) due to the pressure difference in the secondary chamber (12) during the exhaust process of the main chamber (11) includes: Exhausting the main chamber (11) creates a pressure difference between the main chamber (11) and the secondary chamber (12); Due to the pressure difference, the secondary chamber (12) sprays the medium into the main chamber (11) through the air outlet group (14) thereon to perform flow disturbance.

10. The method for operating a multiple-return reflection sample cell according to claim 9, wherein: The method in which the regulating mechanism (3) gradually closes the air outlet group (14) due to the pressure difference to gradually reduce the turbulence intensity includes: The secondary chamber (12) gradually reduces the gas pressure by spraying the medium into the main chamber (11); The regulating mechanism (3) gradually closes the air outlet group (14) according to the decrease in the air pressure in the sub-chamber (12), that is, gradually reduces the turbulence intensity.

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