Gas detection optical device and gas detection device

Abstract

The utility model discloses a gas detection optical device and a gas detection device. The gas detection optical device comprises a shell, and a light emitting assembly, at least one wave combining assembly, a refrigerator and a plurality of light excitation assemblies which are arranged on the shell, each optical excitation assembly comprises a substrate, a light emitting chip and a thermistor, the light emitting chip and the thermistor are arranged on the substrate, the substrate is arranged on the refrigerator, and the thermistor is arranged close to the light emitting chip; the plurality of light emitting chips are used for exciting light beams with different preset wavelengths, and the light beams excited by the plurality of light emitting chips are transmitted in a parallel light form; the wave combining assembly and the light emitting assembly are sequentially arranged on a path of a light beam excited by the light emitting chip; the wave combining assembly is used for combining the light beams; and the light emitting assembly is used for emitting the combined light beam out of the shell. High-precision temperature control can be realized, so that the accuracy of the wavelength excited by the light emitting chip is ensured, and the measurement precision of gas detection is effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of optical gas detection, in particular to a gas detection optical component and a gas detection device. Background Art

[0002] Mid-infrared TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology is a spectral detection technology based on the fundamental frequency vibration absorption of gas molecules in the mid-infrared band. It uses the wavelength tunable characteristics of diode lasers to obtain the characteristic absorption spectrum of the measured gas with high resolution, thereby performing quantitative analysis of the target gas.

[0003] In some application scenarios, such as industrial sensing, the gas composition is often complex and multiple gas components need to be detected. By integrating multiple lasers or light emitting chips in one device to emit multiple groups of light beams of different wavelengths, it is possible to detect multiple gas components.

[0004] However, since multiple lasers or light emitting chips are integrated in one device, a large amount of heat will inevitably be generated when they are working. If the heat cannot be dissipated in time for temperature control, the actual temperature requirement of the light beam of the specified wavelength cannot be met, causing the wavelength of the light beam emitted by the light emitting chip or laser to deviate from the required wavelength, affecting the detection results. Utility Model Content

[0005] In order to achieve accurate temperature control of a light emitting chip and ensure gas measurement accuracy, the utility model provides a gas detection optical component and a gas detection device.

[0006] In a first aspect, an embodiment of the utility model provides a gas detection optical device, comprising: a housing and a light emitting component arranged in the housing, at least one wave combining component, a refrigerator and a plurality of light excitation components;

[0007] Each of the light excitation components comprises a substrate, a light emitting chip and a thermistor disposed on the substrate, wherein the substrate is disposed on the refrigerator, and the thermistor is disposed close to the light emitting chip;

[0008] The plurality of light emitting chips are used to excite light beams of different preset wavelengths, and the light beams excited by the plurality of light emitting chips are transmitted in the form of parallel light;

[0009] The wave combining component and the light emitting component are sequentially arranged on the path of the light beam excited by the light emitting chip;

[0010] The wave combining component is used to combine the light beams;

[0011] The light emitting component is used to emit the combined light beam to the outside of the housing.

[0012] Optionally, the light excitation component further includes a collimating lens;

[0013] The collimating lens is arranged on the refrigerator, and the central axis of the collimating lens and the light beam excited by the light emitting chip are on the same axis.

[0014] Optionally, the light emitting component includes a wave combining prism;

[0015] The wave combining prism comprises an incident surface and an output surface which are arranged opposite to each other, wherein the incident surface is arranged toward the wave combining component and is perpendicular to the light beam emitted by the wave combining component;

[0016] The housing is provided with a light window facing the output surface;

[0017] The combining prism is used to combine the light beams emitted by the combining component and then emit the light beams to the outside of the housing through the light window.

[0018] Optionally, the wave combining component includes at least one wave combiner fixed in the housing;

[0019] The combiner comprises an outlet port and a plurality of inlet ports;

[0020] The inlet end is arranged in one-to-one correspondence with the light emitting chip;

[0021] The outlet end is arranged toward the incident surface of the wave combining prism.

[0022] Optionally, the gas detection optical device further comprises at least one isolator fixed in the housing;

[0023] The isolators are arranged in one-to-one correspondence with the combiners;

[0024] The isolator is arranged between the combiner and the combiner prism.

[0025] Optionally, the number of the optical excitation components is six;

[0026] The light emitting chips of the light excitation components are arranged in parallel, so that the light beams excited by the light emitting chips are parallel to each other;

[0027] The preset wavelengths of the light beams excited by the light emitting chips are: 1529nm, 1565nm, 1579nm, 1630nm, 1650nm, and 1680nm respectively.

[0028] Optionally, the wave combining component includes a first wave combiner and a second wave combiner;

[0029] The first combiner is configured to correspond to the light emitting chip with preset wavelengths of 1529nm, 1565nm and 1579nm for the light beam;

[0030] The second combiner is arranged corresponding to the light emitting chip whose preset wavelength of the light beam is 1630nm, 1650nm, and 1680nm.

[0031] Optionally, the substrate includes at least one of a COC substrate, a PTFE substrate or a ceramic substrate.

[0032] Optionally, the gas detection optical device also includes an optical power meter arranged on the optical window.

[0033] Optionally, the gas detection optical device also includes a beam quality analyzer arranged on the optical window.

[0034] In a second aspect, an embodiment of the utility model provides a gas detection device, including a housing, a detection unit arranged in the housing, a gas chamber, and the gas detection optical device described in the first aspect;

[0035] The gas chamber is arranged close to the light emitting assembly and is used to contain the gas to be tested;

[0036] The detection unit is used to obtain the characteristic absorption spectrum of the gas to be detected.

[0037] The beneficial effects of the above technical solution provided in the embodiment of the utility model include at least:

[0038] The utility model proposes a gas detection optical device, which provides a refrigerator and a thermistor near each light emitting chip. Each thermistor measures the temperature of the corresponding light emitting chip in real time and quickly transmits the temperature to the refrigerator. It can quickly respond to temperature changes and make adjustments. When the temperature exceeds a set threshold, the refrigerator starts and cools down until the temperature returns to a normal range and meets the temperature requirements, thereby achieving high-precision temperature control to ensure the accuracy of the wavelength excited by the light emitting chip and effectively ensure the measurement accuracy of gas detection.

[0039] By arranging the thermistor on the substrate and close to the light emitting chip, compared with the method of arranging the thermistor and the substrate separately on the refrigerator, the utility model can make the thermistor closer to the light emitting chip, so as to facilitate the real-time and accurate acquisition of the temperature of the light emitting chip, thereby realizing accurate temperature control of the light emitting chip.

[0040] The utility model can meet the demand for long-distance gas detection by arranging the light beam to be transmitted in the form of parallel light, and can also ensure that the gas detection under long-distance conditions still has high detection accuracy.

[0041] The utility model can emit light beams of different preset wavelengths by setting multiple emission chips, and detect different components in multi-component gas by staggered opening of the light emission chips, or realize the function of detecting different gases. In the prior art, multiple sets of gas detection equipment are used to detect one gas respectively to obtain the components of the gas. The multiple sets of gas detection equipment in the prior art require a large space and are expensive. Compared with the prior art, the utility model can complete the detection of different components in the gas by only setting one gas detection optical device, which is convenient for reducing the volume and saving costs.

[0042] The present invention provides an embodiment of the present invention. Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the written description and the drawings.

[0043] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0045] Figure 1 A schematic diagram of the structure of a gas detection optical device provided in an embodiment of the utility model;

[0046] Figure 2 is an enlarged schematic diagram of the light excitation component;

[0047] 1. Shell; 11. Light window; 2. Refrigerator; 3. Light excitation component; 31. Substrate; 32. Light emitting chip; 33. Thermistor; 4. Collimating lens; 5. Combiner component; 51. First combiner; 511. Inlet port; 52. Second combiner; 6. Light output component; 61. Combiner prism; 7. Isolator. DETAILED DESCRIPTION

[0048] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0049] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "far", "near", "front", "rear" 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, and do not indicate or imply 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 a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] See also Figure 1 and Figure 2 The present embodiment provides a gas detection optical device, including a housing 1 and a light emitting component 6 arranged on the housing 1, at least one wave combining component 5, a refrigerator 2 and a plurality of light excitation components 3, wherein the refrigerator 2 may be a TEC (semiconductor refrigerator). Each light excitation component 3 includes a substrate 31 and a light emitting chip 32 and a thermistor 33 arranged on the substrate 31, wherein the substrate 31 is arranged on the refrigerator 2, and the thermistor 33 is arranged close to the light emitting chip 32. The plurality of light emitting chips 32 are used to excite light beams of different preset wavelengths, and the light beams excited by the plurality of light emitting chips 32 are transmitted in the form of parallel light. The wave combining component 5 and the light emitting component 6 are sequentially arranged on the path of the light beam excited by the light emitting chip 32.

[0052] When in use, multiple light emitting chips 32 respectively excite light beams of different preset wavelengths, and multiple light beams all pass through the combining component 5. After the combining component 5 combines the multiple light beams, the light beams pass through the light emitting component 6, and the light emitting component 6 emits the combined light beams to the outside of the shell 1. The outside of the shell 1 can be filled with gas to be detected. When the light beam is emitted to the outside of the shell 1, it can pass through the gas. The gas molecules have an absorption effect on the infrared light of a specific wavelength in the light beam. By measuring the absorption spectrum of the gas to the infrared light, the gas to be detected can be quantitatively analyzed to obtain the composition information of the gas to be detected. After the light beam is excited by the light emitting chip 32, it is transmitted in the form of parallel light in the process of being transmitted to the combining component 5, the light emitting component 6 and then to the outside of the shell 1. That is, the light beam excited by the light emitting chip 32 can be emitted from the outside of the shell 1 in the form of parallel light, thereby meeting the needs of long-distance gas detection and ensuring that the gas detection under long-distance conditions still has high detection accuracy.

[0053] In this embodiment, multiple emission chips 32 are integrated and designed, and different components in a multi-component gas are detected by staggered opening of the light emission chips 32, or the function of detecting different gases is realized. Compared with the prior art, multiple sets of gas detection equipment are used to detect a gas respectively to obtain the components of the gas. The multiple sets of gas detection equipment in the prior art require a large space and are expensive. In this embodiment, only one gas detection optical device is required to complete the detection of different components in the gas, which is convenient for reducing the volume and saving costs.

[0054] In this embodiment, since the light emitting chip 32 generates heat when working, if the heat cannot be dissipated in time, the temperature of the light emitting chip 32 will exceed the set threshold, so that the wavelength of the light beam excited by the light emitting chip 32 cannot meet the requirements of stability and accuracy, resulting in errors in the gas detection results. In order to ensure the measurement accuracy, the light emitting chip 32 is precisely controlled by setting a refrigerator 2 and multiple thermistors 33, and the output signal of the thermistor 33 is connected to the refrigerator 2, which can realize the automation of temperature monitoring and control, and improve the accuracy and efficiency of temperature control. Specifically, a thermistor 33 is set near each light emitting chip 32, so that multiple thermistors 33 respectively measure the temperature of each light emitting chip 32 in real time, and quickly transmit the temperature to the refrigerator 2, which can quickly respond to temperature changes and make adjustments. When the temperature exceeds the set threshold, the refrigerator 2 starts and cools down until the temperature returns to the normal range, thereby achieving high-precision temperature control to ensure the accuracy of the wavelength excited by the light emitting chip 32 and effectively ensure the measurement accuracy of gas detection.

[0055] Compared to the method of separately setting the thermistor 33 and the substrate 31 on the refrigerator 2, the present embodiment sets the thermistor 33 on the substrate 31 and close to the light emitting chip 32, so that the thermistor 33 is closer to the light emitting chip 32, which facilitates the real-time and accurate acquisition of the temperature of the light emitting chip 32, thereby realizing precise temperature control of the light emitting chip 32.

[0056] In a specific embodiment, see Figure 1 The light excitation component 3 also includes a collimating lens 4, which is arranged in the refrigerator 2 and between the wave combining component 5 and the light excitation component 3. The function of the collimating lens 4 is to shape the light beam so that the divergent light beam becomes a parallel light beam after passing through the collimating lens 4, which is an important prerequisite for ensuring that the light beam is transmitted in the form of parallel light. The central axis of the collimating lens 4 is on the same axis as the light beam excited by the light emitting chip 32 to ensure that the light beam can accurately and effectively pass through the collimating lens 4 and form a parallel light beam after refraction by the collimating lens 4, which can minimize the deflection and scattering of the light beam, thereby improving the collimation and energy concentration of the light beam.

[0057] In a specific embodiment, see Figure 1 , the light emitting component 6 includes a combining prism 61, and the combining prism 61 includes an incident surface (not marked in the figure) and an output surface (not marked in the figure) arranged opposite to each other. The incident surface is the surface where the light beam first enters the combining prism 61, and the output surface is the surface where the light beam exits the combining prism 61. Light beams of different wavelengths enter the combining prism 61 from the incident surface of the combining prism 61, and after being combined into one light beam, they are combined and emitted from the output surface of the combining prism 61. The housing 1 is provided with a light window 11 toward the output surface. After the combining prism 61 combines the light beams excited by the light emitting chip 32, the light beams are emitted to the outside of the housing 1 through the light window 11. The incident surface is arranged toward the combining component 5, and is perpendicular to the light beams emitted by the combining component 5, so as to ensure that the light beams are transmitted in the form of parallel light, and can be combined into one parallel light beam after passing through the combining prism 61, so as to meet the demand for long-distance gas detection, and also ensure that the gas detection under long-distance conditions still has high detection accuracy.

[0058] In a specific embodiment, see Figure 1The wave combiner assembly 5 includes at least one combiner fixed in the housing 1. The combiner includes an outlet port (not shown in the figure) and a plurality of inlet ports 511. The inlet ports 511 are arranged one by one with the light emitting chips 32, and the outlet ports are arranged toward the incident surface of the combiner prism 61. After the light beam excited by each light emitting chip 32 is collimated by the collimating lens 4, it enters the combiner through the inlet ports 511 of the combiner respectively. A plurality of light beams of different preset wavelengths are combined in the combiner so as to more effectively use the light beams of different preset wavelengths to detect the gas to be tested. The combined light beam is emitted from the outlet port of the combiner, and after passing through the combiner prism 61, it is emitted from the light window 11.

[0059] In a specific embodiment, see Figure 1 The gas detection optical device also includes at least one isolator 7 fixed in the housing 1, and the isolator 7 is arranged between the combiner and the combiner prism 61. The number of isolators 7 is the same as that of combiners, and the isolators 7 are arranged one by one with the combiners, that is, an isolator 7 is arranged between the combiner prism 61 and each combiner, and the isolator 7 can be optically isolated from the reflected light generated by the light beam during the transmission process to prevent the reflected light from returning to the light emitting chip 32 and having a negative impact on its performance, such as causing power fluctuations, reducing the signal-to-noise ratio, etc., thereby increasing the overall stability of the gas detection optical device.

[0060] In a specific embodiment, see Figure 1 and Figure 2 The number of the light excitation components 3 is six, and the light emitting chips 32 of each light excitation component 3 are arranged in parallel, so that the light beams excited by each light emitting chip 32 are parallel to each other. The preset wavelengths of the light beams excited by each light emitting chip 32 are: 1529nm, 1565nm, 1579nm, 1630nm, 1650nm, 1680nm.

[0061] In a specific embodiment, see Figure 1 and Figure 2 The combining component 5 includes a first combiner 51 and a second combiner 52. The first combiner 51 is set for the light emitting chips 32 with preset wavelengths of 1529nm, 1565nm and 1579nm, and the second combiner 52 is set for the light emitting chips 32 with preset wavelengths of 1630nm, 1650nm and 1680nm. In order to ensure the balanced measurement accuracy of the length of each light beam, this embodiment adopts the form of one combiner for each three light emitting chips 32 (that is, six light emitting chips 32 are combined by two combiners), so as to minimize the optical path difference between the light emitting chips 32, avoid the situation where the optical path difference is too large, the optical power loss is large and the light spot formed by the light beam is large, which leads to low measurement accuracy of the light path with a long optical path distance.

[0062] In a specific embodiment, see Figure 2 The substrate 31 serves as a receiving platform for the light emitting chip 32 and a bridge between the light emitting chip 32 and the external circuit. The substrate 31 should have a low dielectric constant, a low dielectric loss factor and other good high-frequency electrical properties. The substrate 31 includes at least one of a COC substrate, a PTFE substrate or a ceramic substrate. The substrate 31 made of these three types of materials has the above-mentioned excellent high-frequency electrical properties, which can ensure the working stability of the light emitting chip 32.

[0063] In a specific embodiment, see Figure 1 The gas detection optical device also includes an optical power meter (not shown in the figure) disposed on the optical window 11, which can detect the optical power of the light beam. Before using the gas detection optical device to detect the gas to be detected, the gas detection optical device is calibrated with the optical power meter. Specifically, the position of a single collimating lens 4 is moved until the measured optical power meets the requirements.

[0064] In a specific embodiment, see Figure 1 The gas detection optical device also includes a beam quality analyzer (not shown in the figure) disposed on the optical window 11. Before the gas detection optical device is used to detect the gas to be detected, the beam quality analyzer is used to calibrate the gas detection optical device. Specifically, the position of a single collimating lens 4 is moved until the measured light spot meets the requirements.

[0065] This embodiment also provides a method for assembling the gas detection optical device as follows:

[0066] Step S1 , installing and fixing the multiplexing prism 61 in the housing 1 with the central axis of the light window 11 as a reference.

[0067] Step S2: With the incident surface of the combiner prism 61 as a reference, the isolator 7 and the combiner are respectively installed and fixed in the housing 1.

[0068] Step S3: installing the refrigerator 2 at a designated position in the housing 1 .

[0069] Step S4, taking the inlet end of the combiner as a reference, fixing the light excitation component 3 corresponding to the inlet end of the combiner on the refrigerator 2.

[0070] In step S4, before fixing the light excitation component 3 to the refrigerator 2, it also includes assembling the light excitation component 3 and obtaining the temperature and required driving current actually corresponding to the light beam of the preset wavelength excited by the light emitting chip 32. The specific method includes measuring the initial emission wavelength of the light emitting chip 32 under the existing temperature and current, combining the preset wavelength actually required, debugging and obtaining the temperature and current corresponding to the preset wavelength and the preset light power when emitting. In the above debugging process, the principle of debugging is: when the current increases, the power increases and the wavelength becomes longer; when the temperature decreases, the power increases and the wavelength becomes smaller. After debugging, the light excitation component 3 is assembled and fixed to the refrigerator 2, and the light excitation component 3 and the refrigerator 2 are respectively wired with the corresponding pins of the shell 1 to achieve electrical connection.

[0071] Step S5, fixing the collimating lens 4.

[0072] In step S5, in the process of fixing the collimating lens 4, the collimating lens 4 is also debugged. Specifically, a current corresponding to the preset wavelength is applied to the light excitation component 3 (the current is obtained by debugging in step S3), and the refrigerator 2 is controlled to make the temperature of the light excitation component 3 meet the requirements (the temperature is obtained by debugging in step S3). An optical power meter or a beam quality analyzer is set at the light window 11 of the housing 1, and the position of a single collimating lens 4 is moved until the optical power measured by the optical power meter meets the requirements, or the position of a single collimating lens 4 is moved until the light spot measured by the beam quality analyzer meets the requirements.

[0073] In step S5, fixing the collimating lens 4 is the last step of the gas detection optical device assembly method, which can meet the precise alignment between multiple combiners, thereby ensuring the gas detection accuracy and the balanced measurement accuracy of each wavelength.

[0074] Embodiment 2

[0075] Based on the same inventive concept, this embodiment provides a gas detection device, including a housing, a detection unit arranged in the housing, a gas chamber, and the gas detection optical device in the first embodiment;

[0076] The gas chamber is arranged near the light emitting assembly and is used to contain the gas to be measured;

[0077] The detection unit is used to obtain the characteristic absorption spectrum of the gas to be tested.

[0078] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. The present disclosure is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A gas detection optical device, characterized in that: include: A housing and a light emitting component, at least one wave combining component, a refrigerator and a plurality of light excitation components arranged in the housing; Each of the light excitation components comprises a substrate, a light emitting chip and a thermistor disposed on the substrate, wherein the substrate is disposed on the refrigerator, and the thermistor is disposed close to the light emitting chip; The plurality of light emitting chips are used to excite light beams of different preset wavelengths, and the light beams excited by the plurality of light emitting chips are transmitted in the form of parallel light; The wave combining component and the light emitting component are sequentially arranged on the path of the light beam excited by the light emitting chip; The wave combining component is used to combine the light beams; The light emitting component is used to emit the combined light beam to the outside of the housing.

2. The gas detection optical device according to claim 1, characterized in that: The optical excitation assembly also includes a collimating lens; The collimating lens is arranged on the refrigerator, and the central axis of the collimating lens and the light beam excited by the light emitting chip are on the same axis.

3. The gas detection optical device according to claim 1, characterized in that: The light emitting component includes a wave combining prism; The wave combining prism comprises an incident surface and an output surface which are arranged opposite to each other, wherein the incident surface is arranged toward the wave combining component and is perpendicular to the light beam emitted by the wave combining component; The housing is provided with a light window facing the output surface; The combining prism is used to combine the light beams emitted by the combining component and then emit the light beams to the outside of the housing through the light window.

4. The gas detection optical device according to claim 3, characterized in that: The wave combining component includes at least one wave combiner fixed in the housing; The combiner comprises an outlet port and a plurality of inlet ports; The inlet end is arranged in one-to-one correspondence with the light emitting chip; The outlet end is arranged toward the incident surface of the wave combining prism.

5. The gas detection optical device according to claim 4, characterized in that: Also included is at least one isolator fixed in the housing; The isolators are arranged in one-to-one correspondence with the combiners; The isolator is arranged between the combiner and the combiner prism.

6. The gas detection optical device according to claim 4, characterized in that: The number of the optical excitation components is six; The light emitting chips of the light excitation components are arranged in parallel, so that the light beams excited by the light emitting chips are parallel to each other; The preset wavelengths of the light beams excited by the light emitting chips are: 1529nm, 1565nm, 1579nm, 1630nm, 1650nm, and 1680nm respectively.

7. The gas detection optical device according to claim 6, characterized in that: The wave combining component comprises a first wave combiner and a second wave combiner; The first combiner is configured to correspond to the light emitting chip with preset wavelengths of 1529nm, 1565nm and 1579nm for the light beam; The second combiner is arranged corresponding to the light emitting chip whose preset wavelength of the light beam is 1630nm, 1650nm, and 1680nm.

8. The gas detection optical device according to claim 3, characterized in that: Also included is an optical power meter disposed on the optical window.

9. The gas detection optical device according to claim 3, characterized in that: It also includes a beam quality analyzer arranged on the light window.

10. A gas detection device, characterized in that: It comprises a housing, a detection unit arranged in the housing, a gas chamber and a gas detection optical device according to any one of claims 1 to 9; The gas chamber is arranged close to the light emitting assembly and is used to contain the gas to be tested; The detection unit is used to obtain the characteristic absorption spectrum of the gas to be detected.

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