44results about How to "Increase the effective optical path" patented technology

The invention relates to a laser gas analyzer and a calibration method; wherein, the laser gas analyzer comprises a light source radiation unit used for generating semiconductor laser beams, a spectroscopy unit which respectively transmits the generated laser beams to a reference cell which is internally encapsulated by zero gas and gas to be measured with known consistency and a measurement cell where the gas to be measured is pumped into during the measurement process and the zero gas and end gas are respectively pump into during the calibration process, a reference detector which is used for obtaining the energy intensity of the laser beam which passes through the reference cell and positioning the absorption peak wavelength of the gas spectrum, and a measurement detector which is used for measuring the energy intensity of the laser beam which passes through the measurement cell and determining the gas consistency during the measurement process; and the calibration method combines the energy signals of the laser beams obtained by the two detectors with a specific arithmetic to carry out zero calibration and end calibration on the instrument. The laser gas analyzer has the advantages of wide application range, simple calibration operation process, saving time, reducing the production cost and usage cost and the like owning to the characteristics of sealed laser passage and multi-optical passages.

Photocatalyst preparation method for glass fiber net carried TiO2 fixed membrane belongs to degradation pollution technique field. Use flexible glass fiber net after heat treatment as carrier; take butyl titanate, alcohol, water and nitric acid as volume share of 1:3~12:0.02~0.2:0.01~0.1 to prepare sol-gal liquid; use soakage-pulling method to make hard coat; after airing, finish hydrolysis and polycondensation; finally, bake to remove organic and make TiO2 fastness; repeat process and obtain TiO2 fixed membrane with determined thickness. It is easy to operate and produce in large scale; the product has high purity and can be used repeatedly; the TiO2 fixed membrane photocatalyst of this invention has high activity, good durability, and large specific surface; the membrane module is convenient to assemble, with cheap price and wide application both for drink water advanced treatment, pretreatment and terminal treatment for toxic harmful high content hard-degradation organic waste water, and treatment for polluted air.

The present invention belongs to the technical field of gas-sensitive detection, and relates to a gas-sensitive absorption device based on a hollow optical fibre. By using the hollow property of the hollow optical fibre, when light rays are restrained in the optical fibre for transmission, the detected gas is also capable of passing through the inner part of the hollow optical fibre which can be used as a light transmitting device (an optical waveguide), as well as a light absorption device (an absorption cell). The realizing procedure is that gas flows into the hollow optical fibre via front and back seal heads; optical signals get into the hollow optical fibre via the front seal head, the optical signals spread in the hollow optical fibre and are absorbed by interaction with the detected gas; emergent lights are led into a tail fibre by a taper coupler, and transmitted to a photosensitive detecting element; and the detection of gas content can be realized by light strength change. The device of the present invention has the advantages of wide transmission wavelength range and high transmission efficiency. The device is used for displacing a gas chamber absorption device in a traditional spectrograph, so as to reduce the requirements to light source and mechanical process, and improve the detection performance of the spectrograph.

The invention relates to an array-type multi-optical-path system for gas-phase monitoring, and belongs to the technical field of gas-phase monitoring. The array-type multi-optical-path system for gas-phase monitoring comprises an array-type multi-optical-path absorption pool and a four-phase spectrometer which are connected with each other via fiber; the array-type multi-optical-path absorption pool is formed by multiple miniature planar mirrors, an open-type air chamber, an fiber coupler and an incidence hole; the planar mirrors are disposed in an arrayed manner, the included angle of each planar mirror and an upper surface or a lower surface is pi / 4, and the last planar mirror is disposed horizontally; the four-phase spectrometer comprises an incidence light hole, an emergent light hole, two photodetection reception holes and a spectroscope; the incidence light hole and the emergent light hole are disposed oppositely; the two photodetection reception holes are disposed oppositely; and the spectroscope is disposed at the center of the spectrometer along the diagonal line of the spectrometer. The array-type multi-optical-path system has the advantages of simple structure, stable performance, convenient monitoring, self-settable valid optical path, and applicability to monitoring on production field gas-phase components and concentration.

The invention discloses a gas absorption tank used in absorption spectrum determination. The gas absorption tank comprises a tank body (1), two plane reflecting mirrors, and a gas chamber. The gas chamber is positioned between the two plane reflecting mirrors. A transmission path of multiple reflected beams is adopted as a main axis. A plane cover (4) is covered on the tank body (1). A plurality of optical windows are provided on the inner wall of the gas chamber of the gas absorption tank. The optical windows are formed by light reflection surfaces of the two plane reflecting mirrors, wherein the light reflection surfaces are exposed in a gas sample. The gas chamber of the gas absorption tank comprises a sample inflow port and a sample outflow port. Light beams are subject to one or moretimes of transmission in the area between the two plane reflecting mirrors. The gas sample flows along the transmission path of the multiple reflected beams.

The invention relates to a long-optical-path gas detection device with a fine adjustment mechanism. The long-optical-path gas detection device comprises a container, wherein the container is internally provided with an airtight gas chamber; a first concave mirror and a second concave mirror which are arranged opposite to an emitting surface are arranged in the gas chamber of the container; a fine adjustment reflecting mirror is arranged on one side of the first concave mirror; a parallel light emitter and a photoelectric sensor are arranged on the container and positioned on the two sides of the first concave mirror; the parallel light emitter is close to the fine adjustment reflecting mirror; a light source emitting end of the parallel light emitter and a light ray receiving end of the photoelectric sensor stretch into the gas chamber. The long-optical-path gas detection device adopts a multiple reflection method to reduce the volume of the gas chamber and improve the detection capability of an instrument. The fine adjustment reflecting mirror can change the path of reflected light and reflect back the reflected light again, so the effective optical path can be increased and the standard distance effect can be avoided.

The invention provides a multiple-optical-range method and a device for achieving multiple optical ranges and a variable optical-range number. The method includes the following steps: 1) light incident into an angle mirror is reflected back to the angle mirror through a first reflector after being shot from the angle mirror; 2) the light reflected back to the angle mirror in the step 1) is reflected back to the angle mirror through a second reflector after being shot from the angle mirror, wherein the second reflector rotates around the symmetry axis of the angle mirror clockwise or anticlockwise to from the variable optical-range number; and 3) the light reflected back to the angle mirror in the step 2) is completely shot after being reflected through the angle mirror. The method for achieving multiple optical ranges and the variable optical-range number is low in calibration accuracy and easy to realize for engineering, and the device for achieving the multiple optical ranges and the variable optical-range number can be used as a moving device as well as a fixed device.

The embodiment of the invention provides a multiplexing combined polarization-preserving fiber ring implementation method and a polarization-preserving fiber ring. In the implementation method, the two pigtails of an original polarization-preserving fiber ring are respectively connected with the two beam coupling pigtails of two polarizing beam splitters / couplers (PBS) with polarization-preserving fiber pigtails, the two PBSes are connected by the one branch pigtail of each PBS, and the other branch pigtails of the PBSes are used as the two pigtails of the polarization-preserving fiber ring after combination, wherein both the two branch pigtails of each PBS are subject to slow-axis beam propagation and are respectively coupled with the slow axes or fast axes of the two beam coupling pigtails, so that an incident linearly polarized light wave sequentially and respectively circles round the fast axis and the slow axis of the original polarization-preserving fiber ring and then passes through the whole fiber ring. By implementing the technical scheme, the two eigen polarization axes of the polarization-preserving fiber can be fully used, thereby lengthening the effective optical path of the polarization-preserving fiber ring and effectively shortening the required fiber length under identical conditions.

The invention discloses a detection device for the nitrogen oxide content of a gas, which is used for detecting the concentration of nitrogen oxides contained in the gas. The detection device comprises a treater, a program-controlled current source, a laser, a gas absorption pool, a detector and a signal conditioner. By applying the detection device disclosed by the invention, a high-temperature conversion process is not needed, thus reducing power consumption and energy consumption; and moreover, because the content of the nitrogen oxides in the gas is directly measured, the influence of the existence of other substances on a content detection for the to-be-detected gas is avoided, so that the detection result is more accurate. Furthermore, because a ZrO2 sensor does not need to be used, the problem of poisoning of the ZrO2 sensor due to the compounds of P, S and Si, such as H2S is avoided. Meanwhile, because a ZrO2 sensor technology is a technology monopolized by foreign companies, and the ZrO2 sensor does not need to be used in the detection device disclosed by the invention, the existing technical barrier is broken.

The invention provides an extra-high sensitive gas absorption spectrum measuring system based on MEMS. The system comprises a pump laser, a beam modulation device, an optical path pool, a reflective focusing device, an MEMS micro-cantilever, a detection laser, a position sensitive detector, a lock phase amplifier and a central processor, wherein the optical path pool is used for accommodating a tested gas sample; the MEMS micro-cantilever consists of a base and a double-layered structure fixed on the base, and the double-layered structure comprises a black silicon material layer and a metal material layer which is formed on the black silicon material layer. The invention further provides a measuring method of the extra-high sensitive gas absorption spectrum measuring system. By adopting the MEMS technology, the measuring sensitivity is extremely improved and the spectrum measuring range is expanded. Moreover, the system is not sensitive to environmental noise and vibration, and the size and weight of the measuring system are hugely reduced, so that the measuring system can be portable or handheld.

The invention discloses an ultra-thin optical amplification module. The ultra-thin optical amplification module comprises a first phase delay chip, a light transmitting element for partially transmitting and partially reflecting, a lens or lens group, a second phase delay chip, and a first reflection-type polaroid, which are sequentially arranged from an object side to an image side, and the reflectivity of the light transmitting element for partially transmitting and partially reflecting is 10% to 90%; and the lens or lens group is a spherical lens, an aspherical lens, a free-form surface lens, a liquid crystal lens, a super lens, or the like. The ultra-thin optical amplification module disclosed by the invention adopts a polarized light path and the light transmitting element for partially transmitting and partially reflecting to increase an effective optical path in a short distance and shorten the length in an optical axis direction of the optical module, thereby greatly reducing the volume of an optical system comprising the optical amplification module.

The invention discloses an image sensing unit and a manufacturing method thereof, and an image sensor. The image sensing unit is provided with light trapping structures. The incident light is dispersed to various angles after being reflected, scattered and refracted by the light trapping structure, which, with the addition of the reflection function of a sidewall reflecting wall, can extend the effective optical path of the light in the image sensing unit. Therefore, the absorption efficiency of light in the image sensing unit can be improved without increasing the thickness of the device. Inaddition, a manufacturing method of the image sensing unit is disclosed, which realizes the manufacture of the image sensing unit. The image sensing unit has a first light trapping structure and a second light trapping structure, which can improve the light absorption efficiency of the image sensing unit.

The invention provides a vacuum measurement method and device based on an optimal frequency comb, and belongs to the technical field of vacuum measurement. The vacuum measurement method based on the optimal frequency comb comprises the steps of adopting a PDH mechanism for locking a repetition frequency of the optimal frequency comb to the cavity length of an FP cavity in a gas chamber; pumping out all gas in the gas chamber to make the interior of the gas chamber vacuumed, and then obtaining a locked repetition frequency of the optimal frequency comb during vacuum; filling the gas chamber with mixed gas, obtaining a locked repetition frequency of the optimal frequency comb after the gas chamber is filled with the gas, wherein the mixed gas comprises clean gas and pollution gas; adopting the optimal frequency comb as a light source to measure an absorption spectrum of the pollution gas, and obtaining the cleanliness of the interior of the gas chamber according to the absorption spectrum; obtaining vacuum degree in the gas chamber according to the locked repetition frequency of the optimal frequency comb during vacuum and the locked repetition frequency of the optimal frequency combafter the gas chamber is filled with the gas. According to the vacuum measurement method and device, by utilizing the characteristic of a wide spectrum of the optimal frequency comb, partial pressures of various gas components can be measured simultaneously, and the cleanliness is measured while the vacuum degree of the vacuum environment is measured.

The invention belongs to the technical field of gas detection, and relates to a gas detection gas chamber, system and method. The gas detection gas chamber is characterized in that two ends of the gas chamber are respectively provided with reflectors with opposite mirror surfaces, and the reflectors are spherical mirrors with the curvature radius of 500mm. The spherical mirrors with the curvature radius of 500 mm are installed at the two ends of the gas chamber, the spherical mirrors form an array through a plurality of small spherical mirrors, incident light beams can be reflected for multiple times in the gas chamber, the effective optical path is increased, and due to the fact that trace gas is low in concentration and weak in absorption, the absorption degree of the gas to the incident light is effectively increased. According to the method, after the trace gas components are determined by adopting a neural network model, the concentration of the specific gas is calculated, and finally the trace gas components and the concentration are obtained. The gas detection gas chamber, system and method have the advantages of high nonlinear mapping capability, high training speed and the like.

The invention discloses a light beam expanding optical structure comprising a lens array formed by a plurality of stacked micro lenses and triangular prisms arranged at the two ends of the lens array.Each micro lens has a parallelogram structure; two parallel micro lens surfaces of the micro lens are plated with film layers with the reflectivity being 10% to 90%; and film-plated optical surfacesof each micro lens and the triangular prisms are stacked and glued successively to form the optical structure. On the basis of the optical structure, the light path turning-back is realized and the effective light path of an optical system is increased in limited space, so that the mechanical length of the whole system is reduced.

The invention belongs to the technical field of gas measurement, and relates to an optical frequency comb gas detection system and method. The system comprises an optical frequency comb, an air chamber, a photodiode, a data acquisition card and a detection unit, wherein the gas chamber is connected with the photodiode through an optical fiber, and the data acquisition card acquires an electric signal transmitted by the photodiode and sends the electric signal to the detection unit; the detection unit is used for calculating and processing the received electric signal to measure the type and the concentration of the gas; and the gas chamber comprises a reference gas chamber and a reference gas chamber. The system is provided with double air chambers, spherical mirrors are installed at the two ends of the air chambers, and the spherical mirrors form an array through a plurality of small spherical mirrors; therefore, the incident light beam can be reflected for multiple times in the gas chamber, the effective optical path is increased, and the absorbance of the gas to the incident light is effectively increased. Besides, after the trace gas components are determined by adopting the neural network model, the concentration calculation is performed on specific gas, so that the method has the advantages of high nonlinear mapping capability, high training speed and the like.

The invention relates to the field of flue gas concentration detection and provides a flue gas detection device based on a TDLAS technology and image analysis. The device can detect a gas concentration and a dust concentration in a flue gas at the same time, detection cost is reduced, and detection precision and detection efficiency can be greatly improved. According to the technical scheme, the flue gas concentration detection device based on the TDLAS technology and the image analysis is characterized in that the device comprises a light path module, a gas path module, an integrating spheregas chamber module and a signal processing module; the light path module comprises a detection light source transmitting assembly and a detection light source receiving assembly; the detection light source transmitting assembly, the integrating sphere gas chamber module, the detection light source receiving assembly and the signal processing module are sequentially arranged along a light path transmission direction of a detection light source; the integrating sphere gas chamber module comprises a measurement integrating sphere and a reference integrating sphere which are the same in size and material; and the gas circuit module is connected with the measurement integrating sphere.

The invention relates to a parabolic-mirror-based open type optical long-range pool, and belongs to the field of a gas phase monitoring technology. The parabolic-mirror-based open type optical long-range pool is characterized by comprising four planar parabolic mirrors, an open air gas chamber, optical fiber couplers, horizontal guiderails and a spiral propeller; the four planar parabolic mirrors are distributed in the open gas chamber diagonally and perpendicular to an upper disc and a bottom disc of the open gas chamber; the four horizontal guiderails are diagonally arranged on the upper disc of the open gas chamber, the four horizontal guiderails are correspondingly arranged on the bottom disc of the open gas chamber, the parabolic mirrors are arranged on the horizontal guiderails; incidence holes and emergence holes are formed in the planar parabolic mirrors and provided with the optical fiber couplers; the spiral propeller is connected with and pushes the planar parabolic mirrors to do linear movement. The parabolic-mirror-based open type optical long-range pool has the advantages of being simple in structure, easy to regulate and realize, capable of automatically setting an effective optical path, applicable to automatic online monitoring of low-concentration gas areas of a production site, and the like, and the environment safety of a production site can be guaranteed.

The invention discloses an infrared gas sensor of a long-optical-path miniature infrared gas chamber in the technical field of infrared sensing. The infrared gas sensor comprises a circuit board and the long-optical-path miniature infrared gas chamber, and a light source and a light detector on the circuit board extend into an optical gas chamber main body of the long-optical-path miniature infrared gas chamber. The long-optical-path miniature infrared gas chamber comprises an optical gas chamber body, the optical gas chamber body comprises an annular outer reflecting wall and an inner reflecting wall arranged in the outer reflecting wall, the outer reflecting wall comprises a plurality of concave reflecting mirrors, the side faces of the concave reflecting mirrors are sequentially connected to form a ring, the inner reflecting wall comprises a plurality of plane reflecting mirrors, the side faces of the plane reflecting mirrors are sequentially connected to form a regular polygon, and the curvature center of each concave reflecting mirror is located on the center line of the corresponding inner angle in the regular polygon. Through the special optical gas chamber structural design, the requirement of the gas chamber for the divergence angle of a light source is reduced, a large effective optical path can be ensured in an effective volume, and the gas detection resolution of the sensor is improved.

The invention discloses a back-contact heterojunction solar cell and a manufacturing method thereof. The back-contact heterojunction solar cell comprises a silicon wafer base body layer, wherein a P type contact area and an N type contact area are arranged on the back side of the silicon wafer base body layer, the P type contact area is of a negative camber structure concave towards the silicon wafer base body layer, a back side intrinsic layer, an emitter, a conductive dielectric layer and an emitter electrode are arranged on the P type contact area from inside to outside in sequence, and a back side intrinsic layer, a back electric field layer, a conductive dielectric layer and a back electric field electrode are arranged on the N type contact area from inside to outside in sequence. According to the back-contact heterojunction solar cell and the manufacturing method thereof, the junction characteristic of the solar cell can be improved, wide-angle scattering of incident light inside a substrate is facilitated, the effective optical distance of an absorption layer is increased, and the overall performance of the solar cell is improved.

The invention provides an on-line measuring device and method for gamma radiation optical glass transmittance. The on-line measuring device for gamma radiation optical glass transmittance comprises ashell, a light source emitter, an optical isolator, a mode matching lens, a first high reflection mirror, a first adjustable diaphragm, a Dove prism, a second adjustable diaphragm, a second high reflection mirror, a focusing lens, a photodetector, a driving control module and an acquisition and processing module, wherein the light source emitter is disposed in the shell and is used for emitting adetection light source; the optical isolator, the mode matching lens and the first high reflection mirror are arranged in the shell; the first adjustable diaphragm is arranged on the shell; the Dove prism is made of optical glass to be measured and is arranged in the irradiation area; the second adjustable diaphragm is arranged on the shell; the second high reflection mirror and the focusing lensare arranged in the shell; the photodetector is disposed in the shell and is used for receiving transmitted light passing through the focusing lens; the driving control module is separately connectedwith the light source emitter and the photodetector and is used for providing driving current for the light source emitter and the photodetector and controlling the output wavelength of the light source emitter; and the acquisition and processing module is connected with the photodetector and is used for acquiring and processing transmitted light signals received by the photodetector.

The embodiment of the invention provides a multiplexing combined polarization-preserving fiber ring implementation method and a polarization-preserving fiber ring. In the implementation method, the two pigtails of an original polarization-preserving fiber ring are respectively connected with the two beam coupling pigtails of two polarizing beam splitters / couplers (PBS) with polarization-preserving fiber pigtails, the two PBSes are connected by the one branch pigtail of each PBS, and the other branch pigtails of the PBSes are used as the two pigtails of the polarization-preserving fiber ring after combination, wherein both the two branch pigtails of each PBS are subject to slow-axis beam propagation and are respectively coupled with the slow axes or fast axes of the two beam coupling pigtails, so that an incident linearly polarized light wave sequentially and respectively circles round the fast axis and the slow axis of the original polarization-preserving fiber ring and then passes through the whole fiber ring. By implementing the technical scheme, the two eigen polarization axes of the polarization-preserving fiber can be fully used, thereby lengthening the effective optical path of the polarization-preserving fiber ring and effectively shortening the required fiber length under identical conditions.

The invention relates to a parabolic-mirror-based open type optical long-range pool, and belongs to the field of a gas phase monitoring technology. The parabolic-mirror-based open type optical long-range pool is characterized by comprising four planar parabolic mirrors, an open air gas chamber, optical fiber couplers, horizontal guiderails and a spiral propeller; the four planar parabolic mirrors are distributed in the open gas chamber diagonally and perpendicular to an upper disc and a bottom disc of the open gas chamber; the four horizontal guiderails are diagonally arranged on the upper disc of the open gas chamber, the four horizontal guiderails are correspondingly arranged on the bottom disc of the open gas chamber, the parabolic mirrors are arranged on the horizontal guiderails; incidence holes and emergence holes are formed in the planar parabolic mirrors and provided with the optical fiber couplers; the spiral propeller is connected with and pushes the planar parabolic mirrors to do linear movement. The parabolic-mirror-based open type optical long-range pool has the advantages of being simple in structure, easy to regulate and realize, capable of automatically setting an effective optical path, applicable to automatic online monitoring of low-concentration gas areas of a production site, and the like, and the environment safety of a production site can be guaranteed.

The invention discloses a perovskite battery with a nanostructure at the depression of an anode grating, comprising glass, and an anode layer, a hole transport layer, an active layer, an electron transport layer and a cathode layer are arranged on the glass in sequence. The anode layer is provided with a grating periodically recessed in the anode layer, and an insulating nanostructure is provided on the surface of the grating recess. The invention also discloses a preparation method of the solar cell with the nanostructure at the depression of the anode grating. The present invention has the advantages of providing a perovskite cell with a nano-structure at the depression of the anode grating, and utilizing the composite structure of the nano-grating and insulating nano-particles to improve the light absorption of the solar cell for incident light with a wavelength in the range of 500-800 nm. , thereby improving the photoelectric conversion efficiency of solar cells. The recombination efficiency of intercepted carriers at the anode interface is reduced, the carrier collection efficiency is improved, and the series resistance of the battery is reduced. Nanometer gratings and insulating nanostructures can be obtained by only one photolithography process, saving cost.

The invention provides a vacuum measurement method and device based on an optical frequency comb, belonging to the technical field of vacuum measurement. The vacuum measurement method based on the optical frequency comb includes: using the PDH mechanism to lock the repetition frequency of the optical frequency comb to the cavity length of the FP cavity in the gas chamber; evacuating the gas in the gas chamber to make the gas chamber a vacuum, and obtaining the light locked in the vacuum The repetition frequency of the frequency comb; fill the gas chamber with a mixed gas, and obtain the repetition frequency of the optical frequency comb locked after filling the gas. The mixed gas includes clean gas and polluted gas; the optical frequency comb is used as the light source to measure the absorption spectrum of the polluted gas, And according to the absorption spectrum, the cleanliness of the gas chamber is obtained; according to the repetition frequency of the optical frequency comb locked in vacuum and the repetition frequency of the optical frequency comb locked after filling the gas, the vacuum degree of the gas chamber is obtained. The invention utilizes the wide spectrum characteristic of the optical frequency comb to simultaneously measure the partial pressures of various gas components, and realize the measurement of the cleanliness while measuring the vacuum degree of the vacuum environment.

The invention discloses a multiple-reflection flame atomizer. The multiple-reflection flame atomizer comprises a multiple-reflection absorbing area and an external light path. The multiple-reflection flame atomizer disclosed by the invention has the advantages that the effect of repeatedly penetrating flame is achieved by controlling measuring beams; by collimation of the external light path, the structure of a monochromator is simplified, the limitation of an incident diaphragm is eliminated and the luminous flux is increased; under the premise of not changing the size and the state of the flame, the effective optical path is increased and the detection sensitivity of an instrument is improved.

The invention discloses a gas absorption tank used in absorption spectrum determination. The gas absorption tank comprises a tank body (1), two plane reflecting mirrors, and a gas chamber. The gas chamber is positioned between the two plane reflecting mirrors. A transmission path of multiple reflected beams is adopted as a main axis. A plane cover (4) is covered on the tank body (1). A plurality of optical windows are provided on the inner wall of the gas chamber of the gas absorption tank. The optical windows are formed by light reflection surfaces of the two plane reflecting mirrors, wherein the light reflection surfaces are exposed in a gas sample. The gas chamber of the gas absorption tank comprises a sample inflow port and a sample outflow port. Light beams are subject to one or moretimes of transmission in the area between the two plane reflecting mirrors. The gas sample flows along the transmission path of the multiple reflected beams.

The invention discloses a spiral multi-optical path device for measuring gas concentration, which belongs to the field of optical measurement of gas concentration. The device includes a laser light source module, a spiral multi-optical path cell and an output signal detection module. After the laser light emitted by the laser light source module is reflected back and forth by the spiral multi-optical path cell, it is detected by the output signal detection module to obtain the gas concentration. When the device measures the gas concentration, it can effectively reduce the volume of the optical path pool and lengthen the effective optical path of the light action, thereby effectively improving the spectral detection sensitivity and improving the accuracy of the concentration measurement of the absorbing gas.