Optical detection system and method

Abstract

The invention provides an optical detection system and method, and belongs to the technical field of infrared spectrometers, and the system comprises a light source assembly and a measurement structure assembly; the light source assembly comprises a plurality of infrared light sources, optical fibers, an optical fiber combiner, a collimating lens, a first reflective mirror and a second reflective mirror, each infrared light source is connected with one optical fiber, each optical fiber is connected with the optical fiber combiner, the optical fiber combiner is connected with the collimating lens, and the collimating lens is connected with the first reflective mirror and the second reflective mirror; the measuring structure assembly comprises a first sample cell, a second sample cell, a first detector and a second detector, the first reflective mirror is connected with the first sample cell, the second reflective mirror is connected with the second sample cell, the first sample cell is connected with the first detector, and the second sample cell is connected with the second detector; the second reflective mirror is a semi-transparent semi-reflective mirror. The problem that an existing infrared light source is insufficient in energy is solved, and the influence of the difference of two light sources on the measurement result is avoided.

Description

Technical Field

[0001] The present application relates to infrared spectrometer technology, and in particular to an optical detection system and method. Background Art

[0002] The endogenous gases exhaled by the human body contain characteristic information that is closely related to the physiological metabolism of the human body. By detecting the corresponding exhaled gas components and concentrations, diseases can be diagnosed quickly and non-invasively. For example, for Helicobacter pylori detection, a common detection method is to collect the CO2 gas exhaled by the subject, and then use CO2 gas isotope detection to determine whether the subject is infected with Helicobacter pylori.

[0003] The existing detection of CO2 gas isotopes usually includes optical and non-optical methods. Compared with non-optical methods, optical methods have the advantages of non-contact, high sensitivity, high selectivity and fast response speed. Existing optical methods usually use dual light source detection. However, the dual light source structure has light source differences, which will affect the measurement results. Summary of the invention

[0004] In order to solve the problem in the prior art that the difference between two light sources affects the measurement results and improve the measurement accuracy of the instrument, the present application provides an optical detection system and method.

[0005] In a first aspect, the present application provides an optical detection system, which adopts the following technical solution: An optical detection system comprises: a light source component and a measurement structure component; The light source assembly includes a plurality of infrared light sources, optical fibers, an optical fiber combiner, a collimating lens, a first reflector, and a second reflector, each of the infrared light sources is connected to one of the optical fibers, each of the optical fibers is connected to the optical fiber combiner, the optical fiber combiner is connected to the collimating lens, and the collimating lens is connected to the first reflector and the second reflector respectively; The measuring structure assembly comprises a first sample pool, a second sample pool, a first detector and a second detector, the first reflector is connected to the first sample pool, the second reflector is connected to the second sample pool, the first sample pool is connected to the first detector, and the second sample pool is connected to the second detector; the second reflector is a semi-transparent and semi-reflective mirror; The optical fiber is used to input the light from the plurality of infrared light sources into the optical fiber combiner; The optical fiber combiner is used to combine the light from the infrared light source and input it into the collimating lens; The collimating lens is used to adjust the combined light from the infrared light source into a parallel light beam; The second reflector is used to equally divide the parallel light beam into a first parallel light beam and a second parallel light beam, the first parallel light beam irradiates the first sample pool through the first reflector and obtains a first detection light beam, and the second parallel light beam irradiates the second sample pool through the second reflector and obtains a second detection light beam; The first detector is used to analyze the first detection light and obtain a first detection result; The second detector is used to analyze the second detection light to obtain a second detection result.

[0006] In one embodiment, the angle between the semi-transparent and semi-reflective mirror and the parallel light beam is a preset angle, the semi-transparent and semi-reflective mirror is coated with a metal film, a portion of the parallel light beam is reflected by the metal film to the first reflector, and another portion of the parallel light beam is transmitted by the metal film to the second sample pool.

[0007] In one embodiment, the light beam reflected or transmitted by the metal film corresponds to the absorption peak of the element to be measured.

[0008] In one embodiment, the optical detection system further includes a coupling lens, which is an aspherical lens or a multi-piece spherical lens, and the coupling lens is used to couple the light from each of the infrared light sources into the corresponding optical fiber.

[0009] In one embodiment, the infrared light source, the coupling lens, the optical fiber, the optical fiber combiner and the collimating lens are placed in sequence along the light emitting direction of the infrared light source.

[0010] In one embodiment, the measurement structure component also includes a first narrowband filter, a second narrowband filter, a first focusing lens and a second focusing lens, the first sample pool, the first narrowband filter, the first focusing lens and the first detector are connected in sequence, the second sample pool, the second narrowband filter, the second focusing lens and the second detector are connected in sequence, and the first sample pool and the second sample pool are symmetrically placed and connected to each other through a connecting pipe.

[0011] In one embodiment, the optical detection system further includes a sample injection component, which is connected to the first sample pool and is used to input the sample to be tested into the first sample pool and the second sample pool.

[0012] In one embodiment, the injection assembly includes a base gas inlet, a sample gas inlet, a first solenoid valve, and a second solenoid valve; The first solenoid valve is connected to the bottom gas inlet, and is used to control the bottom gas in the bottom gas inlet to enter the first sample pool; The second solenoid valve is connected to the sample gas inlet, and is used to control the sample gas in the sample gas inlet to enter the first sample pool.

[0013] In one embodiment, the injection assembly further includes a pneumatic device, which is connected to the first sample pool and is used to pressurize the first sample pool and the second sample pool.

[0014] In a second aspect, the present application provides an optical detection method, which adopts the following technical solution: An optical detection method, using an optical detection system, comprising: Inputting the light from multiple infrared light sources into the fiber combiner through optical fibers; The light from the infrared light source is combined by the optical fiber combiner and then input into a collimating lens; The combined light from the infrared light source is adjusted into a parallel light beam by the collimating lens; The parallel light beam is equally divided into a first parallel light beam and a second parallel light beam by a second reflector, the first parallel light beam irradiates a first sample pool through the first reflector to obtain a first detection light beam, and the second parallel light beam irradiates a second sample pool through the second reflector to obtain a second detection light beam; the second reflector is a semi-transparent and semi-reflective mirror; Analyzing the first detection light by a first detector and obtaining a first detection result; The second detection light is analyzed by a second detector to obtain a second detection result.

[0015] In summary, the embodiments of the present invention have the following beneficial effects: The optical detection system and method provided by the present invention solve the problem of insufficient energy of existing infrared light sources by coupling multiple infrared light sources into optical fibers, achieve high-power output and high-frequency modulation, and can be adapted to the optimal frequency of the detector without chopper modulation. In addition, a semi-transparent and semi-reflective lens is used to achieve dual-path illumination, which solves the influence of the difference between the two light sources on the measurement results in the existing solution and improves the measurement accuracy of the instrument.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the following is a detailed description of the preferred embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of the structure of an optical detection system provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of an array infrared LED provided in an embodiment of the present application; Figure 3 A simulation diagram of a coupling lens provided in an embodiment of the present application; Figure 4 A schematic diagram of the optical path diagram of a coupling lens, optical fiber and collimating lens provided in an embodiment of the present application.

[0018] Explanation of the reference numerals: 100, light source assembly; 200, measurement structure assembly; 300, sample injection assembly; 101, infrared light source; 102, LED infrared light source; 103, coupling lens; 104, optical fiber; 105, optical fiber combiner; 106, collimating lens; 107, first reflector; 108, second reflector; 201, first sample cell; 202, first narrow-band filter; 203, first focusing lens; 204, first detector; 205, second sample cell; 206, second narrow-band filter; 207, second focusing lens; 208, second detector; 301, pneumatic device; 302, bottom gas inlet; 303, sample gas inlet. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0020] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0022] There is no urease in the human body, but Helicobocton Pyloni (Hp) can produce highly active urease. Therefore, the method to detect HP in the human stomach is to take 13 C-labeled urea, the urease secreted by HP will decompose the labeled urea to produce 13 The CO2 labeled with C is exhaled from the lungs after circulating in the blood. The CO2 gas exhaled by the subject is collected and detected by a carbon 13 infrared spectrometer. 13 C-urea before and after 13 CO2 and 12 The change in the ratio of CO2 concentration can be used to determine whether the human body is infected with HP.

[0023] There are usually optical and non-optical methods for detecting CO2 gas isotopes. Compared with non-optical methods, optical methods have the advantages of non-contact, high sensitivity, high selectivity and fast response speed. In order to balance the measurement accuracy of the instrument, the difficulty of non-professionals to operate the instrument and the cost of the instrument, non-dispersive infrared (NDIR) is currently commonly used to detect the abundance of carbon dioxide gas isotopes. NDIR is a gas sensor device based on the selective absorption characteristics of the infrared spectrum of different gas molecules and the relationship between gas concentration and absorption intensity (Lambert-Beer law) to identify gas components and determine their concentrations.

[0024] The existing technology often uses blackbody radiation light sources and MEMS light sources. However, blackbody radiation light sources cannot be electrically modulated, so choppers are often used to modulate optical signals, which will increase instrument costs and reduce operational stability.

[0025] Blackbody radiation sources cannot be modulated directly. Existing solutions mostly use a dual light source and dual detector structure, with one light source as a reference signal and the other as a measurement signal to solve the problem of low power of a single light source; a mechanical chopper is used to solve the modulation of the optical signal. Although the use of a chopper can meet the measurement requirements, the consistency of the two light sources is different and the low power and high signal-to-noise ratio affect the measurement accuracy and consistency of the instrument. In addition, the solution uses a mechanical chopper to modulate the optical signal, which will increase the cost of the instrument and reduce the long-term stability of the instrument.

[0026] In order to achieve light source modulation, avoid the use of mechanical choppers and reduce costs, however, two identical MEMS light sources are used for modulation, but the modulation frequency of the light source is low and there are differences between the two light sources, so the detection accuracy is low.

[0027] Therefore, the existing detection of CO2 gas isotopes based on NDIR technology mainly has the following problems: the power of a single light source is low, and the difference in light sources in the dual-light source structure affects the measurement results; the mechanical chopper modulation has high cost and low stability; the MEMS modulation frequency is not high and cannot be adapted to the optimal frequency of the detector, resulting in low detection accuracy.

[0028] Example 1 See also Figure 1 , Figure 1 This is a schematic diagram of the structure of an optical detection system provided in this embodiment. The system can be applied to gas isotope detection. The system includes: A light source assembly 100 and a measurement structure assembly 200, wherein the light source assembly 100 comprises a plurality of infrared light sources 101, optical fibers 104, a fiber combiner 105, a collimating lens 106, a first reflector 107 and a second reflector 108, each of the infrared light sources 101 is connected to one of the optical fibers 104, each of the optical fibers 104 is connected to the fiber combiner 105, the fiber combiner 105 is connected to the collimating lens 106, and the collimating lens 106 is respectively connected to the first reflector 107 and the second reflector 108.

[0029] See also Figure 2 , Figure 2 This is a schematic diagram of the structure of an array infrared LED provided in this embodiment.

[0030] The infrared light source 101 may be an array infrared LED light source, mainly including a PCB board, on which are disposed a plurality of LED infrared light sources 102. The LED infrared light source 102 has a light emission wavelength covering 4um-4.5um, and the infrared LED array light source uses 3×3 LED light sources, or an LED array light source having more than 9 LEDs, to avoid insufficient light source energy.

[0031] See also Figure 3 , Figure 3 A simulation diagram of a coupling lens provided in this embodiment.

[0032] Each LED infrared light source 102 is connected to a corresponding coupling lens 103 and optical fiber 104, so that the light emitted by multiple LED infrared light sources 102 passes through the coupling lens 103 and the optical fiber 104 and is then gathered to the optical fiber combiner 105 for beam combining to obtain a higher-energy LED light beam, thereby solving the problem of insufficient energy of existing infrared LED light sources and achieving high-power output and high-frequency modulation.

[0033] The measurement structure component 200 includes a first sample pool 201, a second sample pool 205, a first detector 204 and a second detector 208. The first reflector 107 is connected to the first sample pool 201, the second reflector 108 is connected to the second sample pool 205, the first sample pool 201 is connected to the first detector 204, and the second sample pool 205 is connected to the second detector 208; the second reflector 108 is a semi-transparent and semi-reflective mirror.

[0034] The sample pool is mainly used to store the sample to be tested, where the sample to be tested can be the gas to be tested, such as the target person taking 13 C-labeled urea in exhaled air before taking 13 C-labeled urea followed by exhaled gas, etc.

[0035] See also Figure 4 , Figure 4 A schematic diagram of the optical path diagram of a set of coupling lenses, optical fibers and collimating lenses provided in this embodiment.

[0036] The optical fiber 104 is used to input the light from the multiple infrared light sources 101 into the optical fiber combiner 105. The optical fiber combiner 105 is used to combine the light from the infrared light sources 101 and input it into the collimating lens 106. The collimating lens 106 is used to adjust the combined light from the infrared light sources into a parallel light beam.

[0037] Since the angles of light emitted by different infrared light sources 101 may not be parallel light, after the light emitted by all infrared light sources 101 is combined by the fiber optic combiner 105, the light beams need to be adjusted to parallel beams by the collimating lens 106 to better meet the detection requirements.

[0038] The second reflector 108 is used to equally divide the parallel light beam into a first parallel light beam and a second parallel light beam. The first parallel light beam irradiates the first sample pool 201 through the first reflector 107 to obtain a first detection light beam. The second parallel light beam irradiates the second sample pool 205 through the second reflector 108 to obtain a second detection light beam. The first detector 204 is used to analyze the first detection light beam and obtain a first detection result. The second detector 208 is used to analyze the second detection light beam and obtain a second detection result.

[0039] By comparing the first test result and the second test result, it can be determined whether the target person is taking 13 C-urea before and after 13 CO2 and 12 The change in the ratio of CO2 concentration can be used to determine whether the target person is infected with Helicobacter pylori.

[0040] The PCB board uses an electric adjustment method to adjust the infrared LED frequency to a range of 500HZ-1000HZ to match the first detector 204 and the second detector 208. The first detector 204 and the second detector 208 are both lead selenide detectors. This embodiment uses electric modulation instead of mechanical choppers for modulation, which reduces mechanical components, not only reduces costs but also reduces the failure rate of the instrument.

[0041] In one embodiment, the angle between the semi-transparent and semi-reflective mirror and the parallel light beam is a preset angle, the semi-transparent and semi-reflective mirror is coated with a metal film, a portion of the parallel light beam is reflected by the metal film to the first reflector 107, and another portion of the parallel light beam is transmitted by the metal film to the second sample pool 205, and the light beam reflected or transmitted by the metal film corresponds to the absorption peak of the element to be measured.

[0042] The preset angle can be 45 degrees. One side of the semi-transparent and semi-reflective mirror is coated with a metal film, and the other side is a transparent glass surface. It has high light transmittance and can transmit the light reflected by the reflective surface. The element to be measured can be the 12CO2 absorption peak or 13CO2.

[0043] In one embodiment, the optical detection system further includes a coupling lens 103 , which is an aspherical lens or a multi-piece spherical lens. The coupling lens 103 is used to couple the light from each infrared light source into the corresponding optical fiber 104 .

[0044] Among them, the first surface curvature radius of the coupling lens 103 is close to the infrared light source 101 end, the curvature radius is 2mm, the corresponding 2nd order coefficient and 4th order coefficient are 0.084 and -0.074 respectively, the other surface curvature radius is -2.5mm, the corresponding 2nd order coefficient and 4th order coefficient are -0.162 and 0.045 respectively, the focal length is 4.17mm, and the material used is calcium fluoride or silicon.

[0045] In one implementation, the infrared light source 101 , the coupling lens 103 , the optical fiber 104 , the optical fiber combiner 105 , and the collimating lens 106 are placed in sequence along the light emitting direction of the infrared light source 101 .

[0046] The optical fiber 104 is a mid-infrared optical fiber or a hollow core optical fiber. The focal length of the collimating lens 106 is 2 mm, and the material used is calcium fluoride or silicon. The parallel beam spot matches the inner diameter of the first sample pool 201 and the second sample pool 205; the parallel beam spot is ≤6 mm.

[0047] In one embodiment, the measurement structure assembly 200 further includes a first narrowband filter 202, a second narrowband filter 206, a first focusing lens 203 and a second focusing lens 207; the first sample pool 201, the first narrowband filter 202, the first focusing lens 203 and the first detector 204 are connected in sequence; the second sample pool 205, the second narrowband filter 206, the second focusing lens 207 and the second detector 208 are connected in sequence; the first sample pool 201 and the second sample pool 205 are symmetrically placed and connected to each other through a connecting pipe.

[0048] Among them, the first narrow-band filter 202 and the second narrow-band filter 206 match the absorption peaks of 12CO2 and 13CO2, and the first sample pool 201 and the second sample pool 205 are interconnected through a connecting tube, so that the bottom gas or sample gas can pass through the first sample pool 201 into the second sample pool 205, so that the first detector 204 and the second detector 208 can both work, avoiding the errors that may be caused when using a single detector for detection.

[0049] In one embodiment, the optical detection system further includes a sample injection component 300 , which is connected to the first sample pool 201 and is used to input the sample to be tested into the first sample pool 201 and the second sample pool 205 .

[0050] The sampling assembly 300 includes a bottom gas inlet 302, a sample gas inlet 303, a first solenoid valve and a second solenoid valve; the first solenoid valve is connected to the bottom gas inlet 302, and is used to control the bottom gas in the bottom gas inlet 302 to enter the first sample pool 201; the second solenoid valve is connected to the sample gas inlet 303, and is used to control the sample gas in the sample gas inlet 303 to enter the first sample pool 201.

[0051] The confidence can be taken by the user to be tested 13 Exhaled CO2 gas before C-labeled urea, the sample gas is taken by the user to be tested 13 The CO2 gas exhaled after C-labeled urea; the sampling assembly 300 also includes a pneumatic device 301, and the sampling assembly 300 is used to collect the sample gas and bottom gas exhaled by the human body, and the gas sample gas and bottom gas sample pool are controlled by the pneumatic device 301; the bottom gas inlet 302 and the sample gas inlet 303 of the sampling assembly 300 are 2, 4, 6, 8, and 10, which are arranged in pairs.

[0052] The first solenoid valve and the second solenoid valve may be disposed at the connection between the pneumatic device 301 and the bottom gas inlet 302 and the sample gas inlet 303 to control the opening and closing of the bottom gas inlet 302 and the sample gas inlet 303 .

[0053] The pneumatic device 301 is used to pressurize the first sample pool 201 and the second sample pool 205, which can increase the absorption intensity and enhance the detector output signal intensity.

[0054] This embodiment solves the problem of insufficient energy of existing infrared light sources by coupling multiple infrared light sources into optical fibers, achieves high-power output and high-frequency modulation, and can match the optimal frequency of the detector without chopper modulation. In addition, a semi-transparent and semi-reflective lens is used to achieve dual-path illumination, which solves the influence of the difference between the two light sources on the measurement results in the existing solution and improves the measurement accuracy of the instrument.

[0055] Example 2 The present application also provides an optical detection method, which is applied to the optical detection system as described in Example 1, and the method includes: The light from multiple infrared light sources is input into the fiber combiner through optical fibers.

[0056] The light from the infrared light source is combined by the optical fiber combiner and then input into the collimating lens.

[0057] The collimating lens adjusts the combined light from the infrared light source into a parallel light beam.

[0058] The parallel light beam is equally divided into a first parallel light beam and a second parallel light beam by a second reflector. The first parallel light beam irradiates the first sample pool through the first reflector to obtain a first detection light beam. The second parallel light beam irradiates the second sample pool through the second reflector to obtain a second detection light beam. The second reflector is a semi-transparent and semi-reflective mirror.

[0059] The first detection light is analyzed by a first detector to obtain a first detection result.

[0060] The second detection light is analyzed by a second detector to obtain a second detection result.

[0061] It can be understood that the implementation method of the optical detection system described in the above-mentioned embodiment 1 is also applicable to this embodiment, so it will not be repeated here.

[0062] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

[0063] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0064] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0065] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An optical detection system, characterized in that: include: A light source assembly (100) and a measurement structure assembly (200); The light source assembly (100) comprises a plurality of infrared light sources (101), optical fibers (104), an optical fiber combiner (105), a collimating lens (106), a first reflector (107) and a second reflector (108); each of the infrared light sources (101) is connected to one of the optical fibers (104); each of the optical fibers (104) is connected to the optical fiber combiner (105); the optical fiber combiner (105) is connected to the collimating lens (106); and the collimating lens (106) is connected to the first reflector (107) and the second reflector (108), respectively; The measurement structure component (200) comprises a first sample pool (201), a second sample pool (205), a first detector (204) and a second detector (208); the first reflector (107) is connected to the first sample pool (201), the second reflector (108) is connected to the second sample pool (205), the first sample pool (201) is connected to the first detector (204), and the second sample pool (205) is connected to the second detector (208); the second reflector (108) is a semi-transparent and semi-reflective mirror; The optical fiber (104) is used to input light from the plurality of infrared light sources (101) into the optical fiber combiner (105); The optical fiber combiner (105) is used to combine the light from the infrared light source (101) and input the light into the collimating lens (106); The collimating lens (106) is used to adjust the combined light beams of the infrared light source (101) into parallel light beams; The second reflector (108) is used to equally divide the parallel light beam into a first parallel light beam and a second parallel light beam, the first parallel light beam irradiates the first sample pool (201) through the first reflector (107) and obtains a first detection light beam, and the second parallel light beam irradiates the second sample pool (205) through the second reflector (108) and obtains a second detection light beam; The first detector (204) is used to analyze the first detection light and obtain a first detection result; The second detector (208) is used to analyze the second detection light to obtain a second detection result.

2. The optical detection system according to claim 1, characterized in that: The angle between the semi-transparent and semi-reflective mirror and the parallel light beam is a preset angle, the semi-transparent and semi-reflective mirror is coated with a metal film, a portion of the parallel light beam is reflected by the metal film to the first reflector (107), and another portion of the parallel light beam is transmitted by the metal film to the second sample pool (205).

3. The optical detection system according to claim 2, characterized in that: The light beam reflected or transmitted by the metal film corresponds to the absorption peak of the element to be measured.

4. The optical detection system according to claim 1, characterized in that: The optical detection system further comprises a coupling lens (103), wherein the coupling lens (103) is a non-spherical lens or a plurality of spherical lenses, and the coupling lens (103) is used to couple the light from each infrared light source (101) into the corresponding optical fiber (104).

5. The optical detection system according to claim 4, characterized in that: The infrared light source (101), the coupling lens (103), the optical fiber (104), the optical fiber combiner (105) and the collimating lens (106) are placed in sequence along the light emission direction of the infrared light source (101).

6. The optical detection system according to claim 1, characterized in that: The measurement structure component (200) further comprises a first narrowband filter (202), a second narrowband filter (206), a first focusing lens (203) and a second focusing lens (207); the first sample pool (201), the first narrowband filter (202), the first focusing lens (203) and the first detector (204) are connected in sequence; the second sample pool (205), the second narrowband filter (206), the second focusing lens (207) and the second detector (208) are connected in sequence; the first sample pool (201) and the second sample pool (205) are symmetrically placed and connected to each other via a connecting pipe.

7. The optical detection system according to claim 1, characterized in that: The optical detection system further comprises a sample injection component (300), wherein the sample injection component (300) is connected to the first sample pool (201) and is used to input a sample to be tested into the first sample pool (201) and the second sample pool (205).

8. The optical detection system according to claim 7, characterized in that: The sample injection assembly (300) comprises a base gas inlet (302), a sample gas inlet (303), a first solenoid valve and a second solenoid valve; The first solenoid valve is connected to the bottom gas inlet (302) and is used to control the bottom gas in the bottom gas inlet (302) to enter the first sample pool (201); The second solenoid valve is connected to the sample gas inlet (303) and is used to control the sample gas in the sample gas inlet (303) to enter the first sample pool (201).

9. The optical detection system according to claim 8, characterized in that: The sample injection assembly (300) further comprises a pneumatic device (301), wherein the pneumatic device (301) is connected to the first sample pool (201) and is used to pressurize the first sample pool (201) and the second sample pool (205).

10. An optical detection method, applied to the optical detection system according to any one of claims 1 to 9, characterized in that: include: Inputting light from a plurality of infrared light sources (101) into a fiber combiner (105) via an optical fiber (104); The light from the infrared light source (101) is combined by the optical fiber combiner (105) and then input into a collimating lens (106); The collimating lens (106) adjusts the combined light beams of the infrared light source (101) into parallel light beams; The parallel light beam is equally divided into a first parallel light beam and a second parallel light beam by a second reflector (108); the first parallel light beam irradiates a first sample pool (201) through a first reflector (107) to obtain a first detection light beam; the second parallel light beam irradiates a second sample pool (205) through a second reflector (108) to obtain a second detection light beam; the second reflector (108) is a semi-transparent and semi-reflective mirror; Analyzing the first detection light by a first detector (204) and obtaining a first detection result; The second detection light is analyzed by a second detector (208) to obtain a second detection result.

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