Light emitting assembly, gas detection optical device and gas detection device

Abstract

The invention discloses a light emitting assembly, a gas detection optical device and a gas detection device. The light emitting assembly comprises a refrigerator and at least one group of light excitation assemblies, each group of optical excitation assembly comprises a substrate, and a light emitting chip, a beam splitter, a filter, a first backlight detection chip and a second backlight detection chip which are arranged on the substrate; the beam splitter is arranged in the backlight direction of the light emitting chip; the first backlight detection chip and the second backlight detection chip are respectively arranged in the transmission direction and the reflection direction of the beam splitter; the filter plate is arranged between the first backlight detection chip and the light splitting plate or between the second backlight detection chip and the light splitting plate; and the refrigerator is used for regulating and controlling the temperature until the ratio of the response current of the second backlight detection chip to the response current of the first backlight detection chip is consistent with the splitting ratio. The abnormal working state of the light emitting chip can be found in time, so that the accuracy and reliability of the light emitting assembly are ensured, and high-precision and high-reliability gas detection can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of optical gas detection, and particularly to an optical emission component, a gas detection optical device, and a gas detection device. Background Art

[0002] Mid-infrared TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology is a spectroscopic detection technology based on the fundamental vibration absorption of gas molecules in the mid-infrared band. By utilizing the wavelength tunable characteristic of a diode laser, the characteristic absorption spectrum of the gas to be measured can be obtained with high resolution, so as to quantitatively analyze the target gas.

[0003] When a gas detection device uses the above mid-infrared TDLAS technology to quantitatively analyze a gas, the gas detection device often needs to set an optical emission chip to excite a light beam. To ensure the accuracy of gas detection, it is necessary to ensure the accuracy and stability of the wavelength of the light beam excited by the optical emission chip. However, since the optical emission chip is extremely sensitive to the ambient temperature, if the ambient temperature changes, the light beam excited by the optical emission chip will not reach the preset excitation wavelength, resulting in poor accuracy of the gas detection result. Summary of the Invention

[0004] In order to achieve the accuracy and reliability of the optical emission component and ensure the gas measurement accuracy, the present invention provides an optical emission component, a gas detection optical device, and a gas detection device, which can timely detect the abnormal working state of the optical emission chip so as to make timely adjustments, ensure that the light beam excited by the optical emission chip reaches the preset excitation wavelength, and realize high-precision and high-reliability gas detection.

[0005] In a first aspect, an embodiment of the present invention provides an optical emission component, including a cooler and at least one group of optical excitation components;

[0006] Each group of the optical excitation components includes a substrate and an optical emission chip, a beam splitter, a filter, a first backlight detection chip, and a second backlight detection chip disposed on the substrate, wherein the substrate is disposed on the cooler;

[0007] The beam splitter is disposed in the backlight direction of the optical emission chip and can reflect and transmit the backlight generated by the optical emission chip respectively, wherein the beam splitter is provided with a splitting ratio;

[0008] The first backlight detection chip and the second backlight detection chip are respectively disposed in the transmission direction and the reflection direction of the beam splitter;

[0009] The filter is disposed between the first backlight detection chip and the beam splitter, or between the second backlight detection chip and the beam splitter, wherein a central wavelength of the filter is consistent with a preset excitation wavelength of the light emitting chip;

[0010] The cooler is configured to perform temperature regulation until a ratio of a response current of the second backlight detection chip to a response current of the first backlight detection chip is consistent with the beam splitting ratio.

[0011] Optionally, the light emitting assembly further includes a thermistor disposed close to the light emitting chip.

[0012] Optionally, the substrate includes at least one of a COC substrate, a PTFE substrate, or a ceramic substrate.

[0013] In a second aspect, an embodiment of the present invention provides a gas detection optical device, including the light emitting assembly in the first aspect.

[0014] Optionally, it at least includes a housing and a light output assembly and a multiplexing assembly disposed in the housing;

[0015] The light emitting assembly is disposed in the housing;

[0016] The multiplexing assembly and the light output assembly are sequentially disposed on a transmission path of a beam excited by the light emitting chip;

[0017] The multiplexing assembly is configured to multiplex the beam;

[0018] The light output assembly is configured to emit the multiplexed beam outside the housing.

[0019] Optionally, the light output assembly includes a multiplexing prism;

[0020] The multiplexing prism includes an incident surface and an output surface disposed opposite to each other, and the incident surface faces the multiplexing assembly;

[0021] The housing is provided with a housing optical window facing the output surface;

[0022] The multiplexing prism is configured to emit the multiplexed beam to the housing optical window and emit it outside the housing through the housing optical window.

[0023] Optionally, the gas detection optical device further includes at least one collimating lens disposed on the cooler;

[0024] The number of the collimating lenses is consistent with the number of the light emitting chips, and they are arranged in one-to-one correspondence;

[0025] The collimating lens is disposed between the corresponding optical emission chip and the multiplexing component, and the central axis of the collimating lens is coaxially arranged with the light beam excited by the optical emission chip.

[0026] Optionally, the multiplexing component includes at least one multiplexer;

[0027] The multiplexer includes an outlet end and at least one inlet end;

[0028] The inlet ends are arranged in one-to-one correspondence with the optical emission chips;

[0029] The outlet end is arranged towards the incident surface of the multiplexing prism.

[0030] Optionally, the gas detection optical device further includes at least one isolator;

[0031] The number of isolators is the same as that of the multiplexers and they are arranged in one-to-one correspondence, and the isolator is disposed between the corresponding multiplexer and the multiplexing prism.

[0032] In a third aspect, an embodiment of the present invention provides a gas detection device, including a housing and a detection unit, a gas chamber and the gas detection optical device described in the second aspect disposed in the housing;

[0033] The gas chamber is disposed close to the light emitting component and is used for accommodating the gas to be detected;

[0034] The detection unit is used to obtain the characteristic absorption spectrum of the gas to be detected.

[0035] The beneficial effects of the above technical solutions provided in the embodiments of the present invention at least include:

[0036] In an embodiment of the present invention, an optical emission component is provided. By disposing a beam splitter in the backlight direction of the optical emission chip, and respectively disposing a first backlight detection chip and a second backlight detection chip in the transmission direction and the reflection direction of the beam splitter, and disposing a filter between the first backlight detection chip and the beam splitter, the backlight generated by the optical emission chip will be transmitted to the beam splitter. The beam splitter divides the backlight into two parts, a reflected light and a transmitted light, according to the set splitting ratio. The reflected light is received and detected by the second backlight detection chip, while the transmitted light is first filtered by the filter and then received and detected by the first backlight detection chip. The first backlight detection chip and the second backlight detection chip can respectively convert the detected energies of the transmitted light and the reflected light into response currents. By comparing the ratio of the response current of the second backlight detection chip to the response current of the first backlight detection chip with the splitting ratio, if the two are the same, the optical emission chip is in a normal working state, otherwise, the optical emission chip is in an abnormal working state. The cooler can be started in time for temperature regulation until the two are restored to be the same.

[0037] By monitoring and obtaining the ratio of the response current of the second backlight detection chip to the response current of the first backlight detection chip, the abnormal working state of the light-emitting chip can be detected in a timely manner, and the cooler can be used for timely adjustment, which can effectively ensure the accuracy and reliability of the light-emitting component, and can achieve high-precision and high-reliability gas detection. At the same time, it also provides an effective means for the fault diagnosis and maintenance of the light-emitting component.

[0038] Other features and advantages of the present invention will be described in the following specification, and part of them will become obvious from the specification, or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the written specification and the drawings.

[0039] The technical solutions of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0040] The 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 to the present invention. In the drawings:

[0041] Figure 1 is the light-emitting component provided in the embodiment of the present invention;

[0042] Figure 2 is the gas detection optical device provided in the embodiment of the present invention;

[0043] Description of the reference numerals:

[0044] 1. Light excitation component; 11. Substrate; 12. Light-emitting chip; 13. Beam splitter; 14. Filter; 15. First backlight detection chip; 16. Second backlight detection chip; 17. Thermistor; 2. Housing; 21. Housing optical window; 3. Cooler; 4. Light output component; 5. Wavelength multiplexing component; 51. Wavelength multiplexer; 6. Collimating lens; 7. Isolator. Detailed Embodiments

[0045] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described 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.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "far", "near", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0048] The inventor found that in the prior art, in order to ensure that the optical emission chip emits a beam with a stable wavelength, a thermistor is usually used to sense the ambient temperature of the optical emission chip, and then the cooler is correspondingly controlled to ensure the constancy of the ambient temperature, and further ensure that the optical emission chip emits a stable beam. However, due to the limited temperature acquisition accuracy of the thermistor and the inability of the thermistor to quickly sense temperature changes, it is impossible to timely use the cooler for temperature regulation, resulting in the actual wavelength of the beam emitted by the optical emission chip deviating from the preset excitation wavelength, and the accuracy of the gas detection result is poor.

[0049] To solve the above problems, through research and development, the inventor proposed an optical emission component, a gas detection optical device, and a gas detection device to timely control the temperature of the optical emission chip and ensure the gas measurement accuracy.

[0050] Embodiment 1

[0051] Refer to Figure 1 and Figure 2, this embodiment proposes an optical emission component, which can be applied to gas detection optical devices. The optical emission component includes a cooler 3 and at least one group of optical excitation components 1. Each group of optical excitation components 1 includes a substrate 11 and an optical emission chip 12, a beam splitter 13, a filter 14, a first backlight detection chip 15 and a second backlight detection chip 16 disposed on the substrate 11. Among them, the substrate 11 is disposed on the cooler 3. A beam splitter 13 is provided in the backlight direction of the optical emission chip 12. The beam splitter 13 can reflect and transmit the backlight generated by the optical emission chip 12 respectively. The beam splitter 13 has a specific splitting ratio (that is, the ratio of the energy of the beam that the beam splitter 13 can reflect to the energy of the beam that can be transmitted). The splitting ratio can be set to 8:2 or 7:3 or 1:1, etc. according to actual use. This embodiment does not make specific limitations. A first backlight detection chip 15 and a second backlight detection chip 16 are successively provided in the transmission direction and the reflection direction of the beam splitter 13. A filter 14 is provided between the first backlight detection chip 15 and the beam splitter 13. The central wavelength of the filter 14 is consistent with the preset excitation wavelength of the optical emission chip 12. For example, if the preset excitation wavelength of the optical emission chip 12 is 1529.26 nm, then the central wavelength of the filter 14 is 1529.26 nm. This filter 14 only allows the beam with a wavelength of 1529.26 nm to pass through. Of course, in other embodiments, a filter 14 can also be provided between the second backlight detection chip 16 and the beam splitter 13.

[0052] During use, when the optical emission chip 12 is in a working state, the generated backlight will be transmitted to the beam splitter 13. The beam splitter 13 divides the backlight into two parts, a reflected light and a transmitted light, according to the set splitting ratio. The reflected light is received and detected by the second backlight detection chip 16, while the transmitted light is first filtered by the filter 14 and then received and detected by the first backlight detection chip 15. The first backlight detection chip 15 and the second backlight detection chip 16 can respectively convert the detected energies of the transmitted light and the reflected light into response currents, and read the corresponding response currents through an ammeter. Of course, other instruments can also be used to read the response currents. This embodiment does not make specific limitations.

[0053] When the optical emission chip 12 is in a normal working state, the ratio of the response current of the second backlight detection chip 16 to the response current of the first backlight detection chip 15 is consistent with the splitting ratio. When the ambient temperature changes, at this time the optical emission chip 12 is in an abnormal working state, and the actual wavelength of the beam emitted by the optical emission chip 12 and the generated backlight deviates from the preset excitation wavelength. The ratio of the response current of the second backlight detection chip 16 to the response current of the first backlight detection chip 15 is no longer consistent with the splitting ratio.

[0054] Taking the splitting ratio of the beam splitter 13 as 1:1, the preset excitation wavelength of the optical emission chip 12, and the central wavelength of the filter 14 as 1529.26 nm as an example for illustration. When the optical emission chip 12 is in a normal working state, the actual wavelength of the backlight generated by the optical emission chip 12 is 1529.26 nm, and this backlight is transmitted and reflected by the beam splitter 13. The transmitted light can completely pass through the filter 14 and is received by the first backlight detection chip 15, that is, the transmitted light received by the first backlight detection chip 15 is 50% of the backlight, and the reflected light received by the second backlight detection chip 16 is 50% of the backlight, that is, the ratio of the response currents obtained by the first backlight detection chip 15 and the second backlight detection chip 16 is 1:1. However, when the ambient temperature changes and the actual accuracy of the existing thermistor 17 cannot accurately and timely read this change, the actual wavelength of the light beam emitted by the optical emission chip 12 and the generated backlight will change accordingly. For example, the actual wavelength decreases to 1528.25 nm. Since the filter 14 only allows light with a wavelength of 1529.26 nm to pass through, the transmittance of the filter 14 will decrease, and the transmitted light received by the first backlight detection chip 15 will be less than 50%, while the reflected light received by the second backlight detection chip 16 is still 50%, that is, the ratio of the response currents obtained by the first backlight detection chip 15 and the second backlight detection chip 16 will change. It is possible to judge whether the actual wavelength of the light beam emitted by the emission chip is the preset excitation wavelength according to the change of this response current ratio. If not, the cooler 3 is used for temperature regulation until the response current ratio becomes 1:1, thereby ensuring the accuracy and stability of the light beam emitted by the optical emission chip 12.

[0055] By monitoring and obtaining the ratio of the response current of the second backlight detection chip 16 to the response current of the first backlight detection chip 15, the abnormal working state of the optical emission chip 12 can be detected in a timely manner, and the cooler 3 can be used for timely adjustment, which can effectively ensure the accuracy and reliability of the optical emission component, and can achieve high-precision and high-reliability gas detection. At the same time, it also provides an effective means for the fault diagnosis and maintenance of the optical emission component.

[0056] In a specific embodiment, refer to Figure 1 and Figure 2, to ensure the measurement accuracy, the optical emission component is also provided with a thermistor 17. The thermistor 17 can be connected to the cooler 3 provided in the gas detection optical device to realize the automation of temperature monitoring and control, and improve the accuracy and efficiency of temperature control. Specifically, the thermistor 17 is arranged at a position close to the optical emission chip 12, so that the thermistor 17 can accurately obtain the ambient temperature of the optical emission chip 12 in real time and quickly transmit the ambient temperature to the cooler 3, which can quickly respond to the temperature change and make adjustments. When the ambient temperature exceeds the set threshold, the cooler 3 starts to cool down until the ambient temperature returns to the normal range, thereby realizing high-precision temperature control to ensure the accuracy of the wavelength of the light beam excited by the optical emission chip 12 and effectively ensuring the measurement accuracy of gas detection. By combining the thermistor 17 and the above method of detecting the backlight using the first backlight detection chip 15 and the second backlight detection chip 16, a double guarantee is formed, which can better ensure the accuracy and stability of the emission wavelength of the optical emission component.

[0057] In a specific embodiment, refer to Figure 1 , the substrate 11 serves as a carrier for the optical emission chip 12 and is a bridge between the optical emission chip 12 and the external circuit. The substrate 11 should have a low dielectric constant, a low dielectric loss factor, and other good high-frequency electrical properties. The substrate 11 includes at least one of a COC substrate, a PTFE substrate, or a ceramic substrate. The substrates made of these three types of materials have the above excellent high-frequency electrical properties, which can ensure the working stability of the optical emission chip 12.

[0058] Embodiment 2

[0059] Based on the same inventive concept, refer to Figure 1 and Figure 2 , this embodiment proposes a gas detection optical device, which at least includes a housing 2 and an optical output component 4, a multiplexing component 5, and the optical emission component in Embodiment 1 provided in the housing 2. The multiplexing component 5 and the optical output component 4 are sequentially arranged on the transmission path of the light beam excited by the optical emission chip 12. The multiplexing component 5 is used to multiplex the light beam. The optical output component 4 is used to emit the multiplexed light beam outside the housing 2.

[0060] In use, the light-emitting chips 12 of each group of light excitation components 1 can respectively excite light beams of different preset excitation wavelengths. Multiple light beams all pass through the multiplexing component 5. After the multiplexing component 5 multiplexes the multiple light beams, the light beam passes through the light output component 4, and the light output component 4 emits the multiplexed light beam outside the housing 2. The outside of the housing 2 can be filled with the gas to be detected. When the light beam is emitted outside the housing 2, it passes through the gas. Gas molecules have an absorption effect on infrared light of a specific wavelength in the light beam. By measuring the absorption spectrum of the gas on the infrared light, quantitative analysis of the gas to be detected is carried out to obtain the component information of the gas to be detected. After being excited by the light-emitting chip 12, during the process of sequentially passing to the multiplexing component 5, the light output component 4 until outside the housing 2, the light beam is transmitted in the form of parallel light, that is, the light beam excited by the light-emitting chip 12 can be emitted outside the housing 2 in the form of parallel light, so as to meet the gas detection requirements at a long distance and ensure high detection accuracy for gas detection under long-distance conditions.

[0061] The inventor found that in some application scenarios, such as the industrial sensing field, the gas components are often relatively complex, and it is necessary to detect multiple components of the gas. The existing solutions generally use multiple sets of gas detection devices to detect multiple components of a gas respectively, which requires a large space and high cost during the experiment.

[0062] To solve the above problems, the inventor integrally arranged multiple light excitation components 1 in the housing 2, and each light-emitting chip 12 can respectively excite light beams of different preset excitation wavelengths, and a time-division control method for a single-channel light-emitting chip 12 is adopted to detect multiple components of the gas. Specifically, the first-channel light-emitting chip 12 can be controlled to emit light of a specified wavelength and power (it is necessary to apply corresponding temperature control current and drive current to the cooler 3 and the light-emitting chip 12 respectively), and maintain for a period of time (at least 15 minutes) to ensure that the ambient temperature and drive current of the light-emitting chip 12 during gas detection can meet the requirements of high precision, that is, to ensure that the wavelength emitted by the light-emitting chip 12 is accurate enough to ensure the gas detection accuracy, and then detection is carried out until the detection is completed. Then control the second-channel light-emitting chip 12 to emit light of a specified wavelength and power, and repeat the above operation until the detection is completed. It should be noted that the number of light excitation components 1 of the gas detection optical device provided in this embodiment is not limited to Figure 2 the two given in the text, and can also be 4, 6, 8, etc., which is not limited here.

[0063] In this embodiment, by integrating multiple optical emission chips 12 and detecting different components in the gas or realizing the function of detecting different gases by controlling the optical emission chips 12 in a time-sharing manner, compared with the prior art method of using multiple sets of gas detection devices to detect one gas respectively, only one gas detection optical device needs to be set in this embodiment to complete the detection of different components in the gas, which is convenient for reducing the volume and saving costs.

[0064] In a specific embodiment, refer to Figure 2 , the light output component 4 includes a multiplexing prism, and the multiplexing prism includes an incident surface (not marked in the figure) and an output surface (not marked in the figure) which are oppositely arranged. Light beams with different wavelengths enter the multiplexing prism from the incident surface of the multiplexing prism, and after being multiplexed into one light beam, they are emitted from the output surface of the multiplexing prism. The housing 2 is provided with a housing optical window 21 facing the output surface. After the multiplexing prism multiplexes the light beams excited by the optical emission chips 12, the light beams are emitted to the outside of the housing 2 through the housing optical window 21. The incident surface faces the multiplexing component 5 and is perpendicular to the light beam emitted by the multiplexing component 5 to ensure that the light beam is transmitted in the form of parallel light and can be combined into a parallel light beam after passing through the multiplexing prism, so as to meet the requirements of long-distance gas detection and ensure high detection accuracy for gas detection under long-distance conditions.

[0065] In a specific embodiment, refer to Figure 2 , the gas detection optical device further includes at least one collimating lens 6 provided on the cooler 3. The number of collimating lenses 6 is the same as that of the optical emission chips 12 and they are arranged in one-to-one correspondence, and the collimating lens 6 is provided between the corresponding optical emission chip 12 and the multiplexing component 5. The function of the collimating lens 6 is to shape the light beam so that the divergent light beam becomes a parallel light beam after passing through the collimating lens 6, 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 6 is coaxially arranged with the light beam excited by the optical emission chip 12 to ensure that the light beam can accurately and effectively pass through the collimating lens 6 and form a parallel light beam after the refraction of the collimating lens 6, which can minimize the deflection and scattering of the light beam, thereby improving the collimation and energy concentration of the light beam.

[0066] In a specific embodiment, refer to Figure 2, the multiplexing component 5 includes at least one multiplexer 51. The multiplexer 51 includes an outlet end (not shown in the figure) and at least one inlet end (not shown in the figure). The inlet ends are arranged in one-to-one correspondence with the optical emission chips 12, and the outlet end is arranged facing the incident surface of the multiplexing prism. The light beams excited by each optical emission chip 12 are collimated by the collimating lens 6 and then enter the multiplexer 51 through the inlet ends of the multiplexer 51 respectively. The light beams of multiple different wavelengths are multiplexed in the multiplexer 51 so as to more effectively use the light beams of different wavelengths to detect the gas to be measured. The multiplexed light beam is emitted from the outlet end of the multiplexer 51 and, after passing through the multiplexing prism, is emitted from the housing optical window 21.

[0067] In a specific embodiment, referring to Figure 2 , the gas detection optical device further includes at least one isolator 7. The number of isolators 7 is the same as that of the multiplexers 51 and they are arranged in one-to-one correspondence, and the isolator 7 is arranged between the corresponding multiplexer 51 and the multiplexing prism. The isolator 7 can perform optical isolation on the reflected light generated during the transmission of the light beam, avoiding the reflected light from returning to the optical emission chip 12 and having a negative impact on its performance, such as causing power fluctuations and reducing the signal-to-noise ratio, thereby increasing the overall stability of the gas detection optical device.

[0068] Embodiment III

[0069] Based on the same inventive concept, this embodiment provides a gas detection device, which includes a housing and a detection unit, a gas chamber and the gas detection optical device in Embodiment I arranged in the housing;

[0070] The gas chamber is arranged close to the light output component and is used to accommodate the gas to be measured;

[0071] The detection unit is used to obtain the characteristic absorption spectrum of the gas to be measured.

[0072] Obviously, those skilled in the art can 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 structures that have been described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited 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 equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A light emitting component, characterized in that: It includes a refrigerator and at least one set of light excitation components; Each group of the light excitation components includes a substrate and a light emitting chip, a spectrometer, a filter, a first backlight detection chip and a second backlight detection chip arranged on the substrate, wherein the substrate is arranged on the refrigerator; The beam splitter is arranged in the backlight direction of the light emitting chip, and can reflect and transmit the backlight generated by the light emitting chip, respectively, wherein the beam splitter is provided with a beam splitting ratio; The first backlight detection chip and the second backlight detection chip are respectively arranged in the transmission direction and the reflection direction of the beam splitter; The filter is arranged between the first backlight detection chip and the spectrometer, or between the second backlight detection chip and the spectrometer, wherein the center wavelength of the filter is consistent with the preset excitation wavelength of the light emitting chip; The refrigerator is used to perform temperature control until the ratio of the response current of the second backlight detection chip to the response current of the first backlight detection chip is consistent with the splitting ratio.

2. The light emitting assembly according to claim 1, characterized in that: Also included is a thermistor disposed close to the light emitting chip.

3. The light emitting assembly according to claim 1 or 2, characterized in that: The substrate includes at least one of a COC substrate, a PTFE substrate or a ceramic substrate.

4. A gas detection optical device, characterized in that: The light emitting assembly comprises the light emitting assembly as claimed in any one of claims 1 to 3.

5. The gas detection optical device according to claim 4, characterized in that: At least comprises a housing and a light emitting component and a wave combining component arranged in the housing; The light emitting component is arranged on the housing; The wave combining component and the light emitting component are sequentially arranged on the transmission 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.

6. The gas detection optical device according to claim 5, 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, and the incident surface is arranged toward the wave combining component; The housing is provided with a housing light window facing the output surface; The combining prism is used to emit the combined light beam to the shell light window, and then emit it to the outside of the shell through the shell light window.

7. The gas detection optical device according to claim 6, characterized in that: Also includes at least one collimating lens disposed on the refrigerator; The number of the collimating lenses is consistent with the number of the light emitting chips, and they are arranged in one-to-one correspondence; The collimating lens is arranged between the corresponding light emitting chip and the wave combining component, and the central axis of the collimating lens is coaxially arranged with the light beam excited by the light emitting chip.

8. The gas detection optical device according to claim 7, characterized in that: The wave combining component includes at least one wave combiner; The combiner comprises an outlet port and at least one inlet port; 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.

9. The gas detection optical device according to claim 8, characterized in that: Also included is at least one isolator; The number of the isolators is the same as that of the combiners, and they are arranged in a one-to-one correspondence, and the isolators are arranged between the corresponding combiners and the combiner prisms.

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 4 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 a characteristic absorption spectrum of the gas to be detected.

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