Gas detection optical device, related method and device

Abstract

The invention discloses a gas detection optical device and a related method and device.In the optical device, a plurality of optical excitation assemblies comprise a plurality of first optical excitation assemblies and a plurality of second optical excitation assemblies which are sequentially arranged on a refrigerator and used for exciting light beams with different preset wavelengths; the first light emitting assembly is arranged on a path of light beams excited by the plurality of first light excitation assemblies and is used for combining waves to obtain a first path of light and emitting the first path of light to the third light emitting assembly; the wave combining assembly and the second light emitting assembly are sequentially arranged on paths of light beams excited by the plurality of second light excitation assemblies; the wave combining assembly is used for combining the light beams excited by at least two adjacent second light excitation assemblies; the second light emitting assembly is used for combining the light beams combined by the wave combining assembly to obtain a second path of light and emitting the second path of light to the third light emitting assembly; a light window is arranged in the light emitting direction of the shell, and the third light emitting assembly is arranged corresponding to the light window and used for combining the first path of light and the second path of light and then emitting the combined light out of the shell through the light window.

Description

Technical Field

[0001] The present invention relates to the technical field of optical gas detection, and particularly to a gas detection optical device, related methods and devices. 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 characteristics of diode lasers, the characteristic absorption spectra of the measured gas can be obtained with high resolution, so as to quantitatively analyze the target gas.

[0003] In some application scenarios, such as the industrial sensing field, the gas composition is often complex and the detection of multiple gas components is required. The existing solutions generally use multiple sets of gas detection devices to detect multiple components in the gas respectively. Summary of the Invention

[0004] In order to increase the selection space of gas detection methods and enrich the product types of gas detection devices, the present invention provides a gas detection optical device, related methods and devices.

[0005] In a first aspect, an embodiment of the present invention provides a gas detection optical device, including: a housing, and a first light emitting component, a second light emitting component, a third light emitting component, at least one multiplexing component, a cooler, and a plurality of light excitation components disposed in the housing;

[0006] The plurality of light excitation components include a plurality of first light excitation components and a plurality of second light excitation components arranged in sequence on the cooler, which are used to excite light beams of different preset wavelengths, and the excited light beams are transmitted in the form of parallel light; the wavelength of the light beam excited by the first light excitation component is less than the wavelength of the light beam excited by the second light excitation component, and the plurality of first light excitation components and the plurality of second light excitation components can be turned on at staggered times;

[0007] The first light emitting component is disposed on the path of the light beams excited by the plurality of first light excitation components, and is used to multiplex the light beams excited by the plurality of first light excitation components to obtain a first path of light and emit it to the third light emitting component;

[0008] The multiplexing component and the second light emitting component are sequentially disposed on the path of the light beams excited by the plurality of second light excitation components;

[0009] The multiplexing component is used to multiplex the light beams excited by at least two adjacent second light excitation components;

[0010] The second light emitting component is used to combine the light beams after being combined by the multiplexing component to obtain a second path of light and emit it to the third light emitting component;

[0011] A light window is provided in the light emitting direction of the housing, and the third light emitting component is arranged corresponding to the light window, and is used to combine the first path of light and the second path of light and then emit them outside the housing through the light window.

[0012] In one or some alternative embodiments, the light excitation component includes a substrate, a light emitting chip and a thermistor disposed on the substrate, wherein the substrate is disposed on the cooler, the thermistor is disposed close to the light emitting chip, and the light emitting chip is used to excite light beams of corresponding wavelengths.

[0013] In one or some alternative embodiments, the gas detection optical device further includes a collimating lens;

[0014] The collimating lens is disposed on the cooler, and the central axis of the collimating lens is on the same axis as the light beam excited by the light emitting chip.

[0015] In one or some alternative embodiments, the second light emitting component includes a second multiplexing prism;

[0016] The second multiplexing prism includes an incident surface and an output surface which are oppositely arranged, the incident surface faces the multiplexing component and is perpendicular to the light beam emitted by the multiplexing component.

[0017] In one or some alternative embodiments, the multiplexing component includes at least one multiplexer fixed in the housing;

[0018] The multiplexer includes an outlet end and a plurality of inlet ends;

[0019] The inlet ends are arranged in one-to-one correspondence with the light emitting chips;

[0020] The outlet end faces the incident surface of the multiplexing prism.

[0021] In one or some alternative embodiments, the gas detection optical device further includes at least one isolator fixed in the housing;

[0022] The isolators are arranged in one-to-one correspondence with the multiplexers;

[0023] The isolator is disposed between the multiplexer and the multiplexing prism.

[0024] In one or some alternative embodiments, the number of the plurality of first light excitation components is two, and the number of the plurality of second light excitation components is six;

[0025] The light-emitting chips of each of the first light excitation components and the second light excitation components are arranged in parallel, so that the light beams excited by each of the light-emitting chips are parallel to each other;

[0026] The preset wavelengths of the light beams excited by the light-emitting chips of each of the first light excitation components are 760 nm and 1392 nm in sequence, and the preset wavelengths of the light beams excited by the light-emitting chips of each of the second light excitation components are 1529 nm, 1565 nm, 1579 nm, 1630 nm, 1650 nm, and 1680 nm in sequence.

[0027] In one or some alternative embodiments, the multiplexing component includes a first multiplexer and a second multiplexer;

[0028] The first multiplexer is arranged corresponding to the light-emitting chips with preset wavelengths of the light beams being 1529 nm, 1565 nm, and 1579 nm;

[0029] The second multiplexer is arranged corresponding to the light-emitting chips with preset wavelengths of the light beams being 1630 nm, 1650 nm, and 1680 nm.

[0030] In a second aspect, an embodiment of the present invention provides an assembling method for a gas detection optical device, including:

[0031] Taking the central axis of the optical window of the housing as the positioning reference, mounting a first light output component and a second light output component in the housing;

[0032] Taking the second light output component as the positioning reference, mounting the multiplexing component;

[0033] Taking the first light output component and the second light output component as the positioning reference, fixing a third light output component in a coupling manner;

[0034] Installing a cooler at a specified position in the housing;

[0035] Taking the input surface of the first light output component as the positioning reference, mounting a first light excitation component with a corresponding wavelength on the cooler;

[0036] Taking the input port with the corresponding wavelength of the multiplexing component as the positioning reference, mounting a second light excitation component with a corresponding wavelength on the cooler.

[0037] 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 first aspect provided in the housing;

[0038] The gas chamber is arranged close to the third light output component and is used for accommodating a gas to be detected;

[0039] The detection unit is used to obtain the characteristic absorption spectrum of the gas to be detected.

[0040] The beneficial effects of the above technical solutions provided in the embodiments of the present invention at least include:

[0041] The present invention provides a gas detection optical device. By arranging a plurality of optical excitation components in a cooler and setting the light beam to be transmitted in the form of parallel light, it can meet the gas detection requirements at a long distance and ensure high detection accuracy for gas detection under long-distance conditions. Moreover, according to the different wavelengths of the light to be emitted, different light beam multiplexing processing methods are respectively adopted. For the light beam with a wavelength that is not strongly absorbed by the gas, a simple multiplexing method is used. For the light beam with a wavelength that is strongly absorbed by the gas, a multiplexing component combined with a light output component is used for multiplexing. By turning on different optical excitation components at different times, different components in the multi-component gas can be detected, or the function of detecting different gases can be realized. Compared with the prior art in which multiple sets of gas detection devices are respectively used to detect the gas to obtain different components in the gas, only by setting one gas detection optical device, the detection of different components in the gas can be completed. This not only greatly reduces the volume, is convenient for carrying and installation, but also, by integrating multiple optical devices, saves the product cost, is more convenient for operation and maintenance, improves the gas detection efficiency, and reduces the resources and costs required in the maintenance and calibration processes.

[0042] The present invention provides a gas detection optical device. By arranging a cooler and setting a thermistor at a position close to each light-emitting chip, each thermistor respectively measures the temperature of the corresponding light-emitting chip in real time and quickly transmits the temperature to the cooler, which can quickly respond to temperature changes and make adjustments. When the temperature exceeds the set threshold, the cooler starts to cool down until the temperature returns to the normal range and meets the temperature requirements, thereby realizing high-precision temperature control to ensure the accuracy of the wavelength excited by the light-emitting chip and effectively guarantee the measurement accuracy of gas detection.

[0043] In the present invention, the thermistor is arranged on the substrate and at a position close to the light-emitting chip. Compared with the method of separately arranging the thermistor and the substrate on the cooler, the present invention can make the thermistor closer to the light-emitting chip, facilitating the real-time and accurate acquisition of the temperature of the light-emitting chip, thereby realizing the precise temperature control of the light-emitting chip.

[0044] In the embodiments of the present invention, other features and advantages of the present invention will be described in the subsequent specification, and, in part, will become obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the written specification and the drawings.

[0045] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0046] 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 to the present invention. In the accompanying drawings:

[0047] Figure 1 It is a schematic structural diagram of a gas detection optical device provided by an embodiment of the present invention;

[0048] Figure 2 It is an enlarged schematic diagram of the optical excitation component;

[0049] 1. Housing; 101. Optical window; 2. Refrigerator; 3. Optical excitation component; 31. Substrate; 32. Optical emission chip; 33. Thermistor; 4. Collimating lens; 5. Wave combining component; 51. First combiner; 511. Inlet end; 52. Second combiner; 6. Second optical output component; 7. Isolator; 8. First optical output component; 9. Third optical output component. Detailed Embodiments

[0050] 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 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 so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0051] 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 accompanying drawings, and 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 therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0052] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" 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 components. 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.

[0053] The inventors found that in the conventional technology, the method of using multiple sets of gas detection devices to detect multiple components in the gas respectively requires a relatively large space for multiple sets of devices and a relatively high cost for spectral detection because one set of gas detection device can only detect one gas component. Based on this, this embodiment provides a gas detection optical device, related methods and devices.

[0054] Embodiment 1

[0055] Refer to Figure 1 and Figure 2 This embodiment provides a gas detection optical device, including: a housing 1, a first light emitting component 8, a second light emitting component 6, a third light emitting component 9, at least one multiplexing component 5, a cooler 2, and multiple light excitation components 3 provided on the housing 1. Among them:

[0056] The multiple light excitation components 3 include multiple first light excitation components and multiple second light excitation components arranged in sequence on the cooler 2, which are used to excite light beams of different preset wavelengths, and the excited light beams are transmitted in the form of parallel light; the wavelength of the light beam excited by the first light excitation component is less than the wavelength of the light beam excited by the second light excitation component, and the multiple first light excitation components and the multiple second light excitation components can be turned on at staggered times;

[0057] The first light emitting component 8 is arranged on the path of the light beams excited by the multiple first light excitation components, and is used to multiplex the light beams excited by the multiple first light excitation components to obtain a first path of light and emit it to the third light emitting component 9.

[0058] The multiplexing component 5 and the second light emitting component 6 are sequentially arranged on the path of the light beams excited by the multiple second light excitation components.

[0059] The multiplexing component 5 is used to multiplex the light beams excited by at least two adjacent second light excitation components.

[0060] The second light emitting component 6 is used to multiplex the light beams after multiplexing by the multiplexing component 5 to obtain a second path of light and emit it to the third light emitting component 9.

[0061] The third light emitting component 9 is used to multiplex the first path of light and the second path of light and emit them outside the housing 1.

[0062] The present invention provides a gas detection optical device. By arranging a plurality of optical excitation components 3 on a cooler 2 and setting the light beam to be transmitted in the form of parallel light, it can meet the gas detection requirements at a long distance and ensure high detection accuracy for gas detection under long-distance conditions. Moreover, according to the different wavelengths of the light to be emitted, different light beam multiplexing processing methods are respectively adopted. For the light beam with a wavelength that is not strongly absorbed by the gas, a simple multiplexing method is used. For the light beam with a wavelength that is strongly absorbed by the gas, a multiplexing component 5 is combined with a light output component for multiplexing. By turning on different optical excitation components 3 at different times, different components in the multi-component gas can be detected, or the function of detecting different gases can be realized. Compared with the prior art in which multiple sets of gas detection devices are respectively used to detect the gas to obtain different components in the gas, only by setting one gas detection optical device, the detection of different components in the gas can be completed. This not only greatly reduces the volume, making it convenient to carry and install, but also, by integrating multiple optical devices, saves the product cost, is more convenient for operation and maintenance, improves the gas detection efficiency, and reduces the resources and costs required in the maintenance and calibration processes.

[0063] In this embodiment, the cooler 2 can be a thermoelectric cooler (TEC).

[0064] In this embodiment, a light window 101 is provided in the light output direction of the housing 1, and the third light output component 9 is arranged corresponding to the light window 101, and is used for multiplexing the first light and the second light and then emitting them to the outside of the housing 1 through the light window 101. In this embodiment, the structures and compositions of the above-mentioned first optical exciter and the second optical exciter can adopt the same or similar structural forms. Refer to Figure 2 As shown, each optical excitation component 3 includes a substrate 31, an optical emission chip 32 and a thermistor 33 arranged on the substrate 31. Among them, the substrate 31 is arranged on the cooler 2, and the thermistor 33 is arranged close to the optical emission chip 32. The optical emission chip 32 is used to excite the light beam of the corresponding wavelength.

[0065] During use, the optical emission chips 32 of each first optical excitation component respectively excite light beams of different preset wavelengths, and the multiple light beams are multiplexed by the first light output component 8 to obtain the first light and emit it to the third light output component 9. The optical emission chips 32 of each second optical excitation component respectively excite light beams of different preset wavelengths, and the 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 second light output component 6, and the second light output component 6 multiplexes the multiplexed light beam again to obtain the second light and emit it to the third light output component 9. The third light output component 9 multiplexes the first light and the second light and then emits them to the outside of the housing 1 through the light window 101.

[0066] The outside of the housing 1 can be filled with the gas to be detected. When the light beam is emitted outside the housing 1, it can pass through the gas. Gas molecules have an absorption effect on the infrared light with 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 can be carried out to obtain the component information of the gas to be detected. After being excited by the light-emitting chip 32, the light beam is transmitted in sequence to the wavelength multiplexing component 5, the light output component until it reaches outside the housing 1. During this process, the light beam is transmitted in the form of parallel light, that is, the light beam excited by the light-emitting chip 32 can be emitted outside the housing 1 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.

[0067] In this embodiment, by integrally designing multiple light-emitting chips 32 and detecting different components in the multi-component gas or realizing the function of detecting different gases by turning on the light-emitting chips 32 at different times, the detection of different components in the gas can be completed only by setting one gas detection optical device, which is convenient for reducing the volume and saving costs.

[0068] The inventor found in the experiment that since multiple light-emitting chips 32 are integrated in one device, a large amount of heat will inevitably be generated when they work. If the heat cannot be dissipated in time for temperature control, the temperature requirement actually required for the light beam with the specified wavelength cannot be met, resulting in the wavelength of the light beam emitted by the light-emitting chip 32 deviating from the required wavelength, and the stable and accurate requirements cannot be achieved, so that the result of gas detection has an error.

[0069] Based on this, in order to ensure the measurement accuracy, the inventor made a further design. By setting the cooler 2 and the thermistor 33, precise temperature control of the light-emitting chip 32 is realized. Connecting the output signal of the thermistor 33 to the cooler 2 can realize the automation of temperature monitoring and control and improve the accuracy and efficiency of temperature control. Specifically, a thermistor 33 is provided at a position close to 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 cooler 2, which can quickly respond to the temperature change and make adjustments. When the temperature exceeds the set threshold, the cooler 2 is started to cool down until the temperature returns to the normal range, so as to realize 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. Compared with the method of separately setting the thermistor 33 and the substrate 31 on the cooler 2, in this embodiment, the thermistor 33 is set 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 is convenient for accurately obtaining the temperature of the light-emitting chip 32 in real time, thereby realizing the precise temperature control of the light-emitting chip 32.

[0070] In a specific embodiment, refer to Figure 1, the gas detection optical device further includes a collimating lens 4, the collimating lens 4 is disposed on the cooler 2, and the central axis of the collimating lens 4 is on the same axis as the beam excited by the optical emission chip 32. Exemplarily, referring to Figure 1 as shown, for the first optical excitation component 3, the collimating lens 4 is disposed at the light output port of the optical emission chip 32 and is on the axis of the beam excited by the optical emission chip 32. For the second optical excitation component 3, the collimating lens 4 is disposed between the multiplexing component 5 and the optical emission chip 32, the collimating lens 4 is disposed at the light output port of the optical emission chip 32 and is on the axis of the beam excited by the optical emission chip 32. The function of the collimating lens 4 is to shape the beam, so that the divergent beam becomes a parallel beam after passing through the collimating lens 4, which is an important prerequisite for ensuring the beam to be transmitted in the form of parallel light. The central axis of the collimating lens 4 is on the same axis as the beam excited by the optical emission chip 32, so as to ensure that the beam can accurately and effectively pass through the collimating lens 4, and after the refraction of the collimating lens 4, a parallel beam is formed, which can minimize the deflection and scattering of the beam, thereby improving the collimation and energy concentration of the beam.

[0071] In a specific embodiment, referring to Figure 1 , the first light output component 8 includes a first multiplexing prism, and the first multiplexing prism is a 45-degree multiplexing prism. The second light output component 6 includes a second multiplexing prism, and the second multiplexing prism includes an incident surface (not marked in the figure) and an output surface (not marked in the figure) which are oppositely arranged. The incident surface is the surface where the beam first enters the second multiplexing prism, and the output surface is the surface where the beam exits the second multiplexing prism. Beams of different wavelengths enter the second multiplexing prism from the incident surface of the second multiplexing prism, and after being combined into a single beam, i.e., multiplexed, they are emitted from the output surface of the second multiplexing prism. The housing 1 is provided with a light window 101 facing the output surface. The incident surface faces the multiplexing component 5 and is perpendicular to the beam emitted by the multiplexing component 5, so as to ensure that the beam is transmitted in the form of parallel light and can be combined into a parallel beam after passing through the second multiplexing prism, so as to meet the gas detection requirements at a long distance and ensure high detection accuracy for gas detection under long-distance conditions.

[0072] In a specific embodiment, referring to Figure 1 , the multiplexing component 5 includes at least one multiplexer fixed in the housing 1. The multiplexer includes an outlet end (not shown in the figure) and a plurality of inlet ends 511. The inlet ends 511 are arranged in one-to-one correspondence with the optical emission chips 32 of the second optical excitation components. The outlet end faces the incident surface of the multiplexing prism. The beam excited by each optical emission chip 32 of the second optical excitation component is collimated by the collimating lens 4 and then enters the multiplexer through the inlet end 511 of the multiplexer respectively. Beams of a plurality of different preset wavelengths are multiplexed in the multiplexer so as to more effectively use the beams of different preset wavelengths to detect the gas to be measured, and the multiplexed beam is emitted from the outlet end of the multiplexer.

[0073] In a specific embodiment, referring to Figure 1 , the gas detection optical device further includes at least one isolator 7 fixed in the housing 1. The isolator 7 is disposed between the multiplexer and the second multiplexing prism. The number of isolators 7 is the same as that of the multiplexers, and the isolators 7 and the multiplexers are arranged in one-to-one correspondence, that is, one isolator 7 is provided between the second multiplexing prism and each multiplexer. The isolator 7 can perform optical isolation on the reflected light generated during the transmission of the light beam, avoiding the return of the reflected light to the optical emission 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.

[0074] In a specific embodiment, referring to Figure 1 and Figure 2 , the number of the plurality of first light excitation components 3 is two, and the number of the plurality of second light excitation components 3 is six. The optical emission chips 32 of each light excitation component 3 are arranged in parallel so that the light beams excited by each optical emission chip 32 are parallel to each other. The preset wavelengths of the light beams excited by the optical emission chips 32 of each first light excitation component 3 are: 760 nm, 1392 nm, and the preset wavelengths of the light beams excited by the optical emission chips 32 of each second light excitation component 3 are: 1529 nm, 1565 nm, 1579 nm, 1630 nm, 1650 nm, 1680 nm.

[0075] In a specific embodiment, referring to Figure 1 and Figure 2 , the multiplexing component 5 includes a first multiplexer 51 and a second multiplexer 52. The first multiplexer 51 is arranged corresponding to the optical emission chips 32 with preset wavelengths of the light beams being 1529 nm, 1565 nm, and 1579 nm, and the second multiplexer 52 is arranged corresponding to the optical emission chips 32 with preset wavelengths of the light beams being 1630 nm, 1650 nm, and 1680 nm. To ensure the balanced measurement accuracy of the optical path lengths of all light beams, for the above 6 second light excitation components 3, in this embodiment, the form of using one multiplexer for every three optical emission chips 32 (that is, two multiplexers are used for multiplexing the six optical emission chips 32) is adopted, which is convenient for minimizing the optical path difference between the optical emission chips 32 as much as possible, avoiding the situation of too large optical path difference, large optical power loss, and large light spot formed by the light beam, thereby resulting in low measurement accuracy of the optical path with a long optical path distance.

[0076] In a specific embodiment, referring to Figure 1 as shown, the first multiplexing prism is a 45-degree 2-wave multiplexing prism. The above-mentioned second multiplexing prism is a 45-degree 6-wave multiplexing prism, and the third multiplexing prism of the above-mentioned third light output component 9 is a 45-degree 8-wave multiplexing prism.

[0077] In a specific embodiment, referring toFigure 2 , the substrate 31 serves as a carrier for the optical emission chip 32 and is a bridge between the optical emission 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 excellent high-frequency electrical properties, which can ensure the working stability of the optical emission chip 32.

[0078] In a specific embodiment, refer to Figure 1 , the gas detection optical device further includes an optical power meter (not shown in the figure) disposed on the optical window 101, which can detect the optical power of the light beam. Before using the gas detection optical device to detect the gas to be measured, use this optical power meter to calibrate the gas detection optical device. Specifically, move the position of the single collimating lens 4 until the measured optical power meets the requirements.

[0079] In a specific embodiment, refer to Figure 1 , the gas detection optical device further includes a beam quality analyzer (not shown in the figure) disposed on the optical window 101. Before using the gas detection optical device to detect the gas to be measured, use this beam quality analyzer to calibrate the gas detection optical device. Specifically, move the position of the single collimating lens 4 until the measured light spot meets the requirements.

[0080] In this embodiment, the function of detecting different gas components for a single product can be realized by time-sharing control of the single-channel optical emission chip 32. The specific working process can be to first control the first-channel optical emission chip 32 to emit light with a specified wavelength and power (specifically realized by applying corresponding temperature control current and drive current to the TEC and the optical emission chip 32), and keep it for a period of time (such as 15 minutes), and then start the detection. After the detection is completed; then control the second-channel optical emission chip 32 to emit light with a specified wavelength and power, and repeat the above operation until the gas detection is completed. Since the temperature adjustment takes a certain amount of time, by keeping it for a period of time before performing the gas detection, it can ensure that the temperature and drive current of the optical emission chip 32 during the gas detection can meet the requirements with high precision, that is, it can ensure that the wavelength emitted by the optical emission chip 32 is accurate enough, thereby ensuring the gas detection accuracy.

[0081] Embodiment Two

[0082] Based on the same inventive concept, this embodiment also provides a method for assembling a gas detection optical device, including the following steps:

[0083] Step S1, taking the central axis of the optical window 101 of the housing 1 as the positioning reference, mount the first light-emitting component 8 and the second light-emitting component 6 in the housing 1.

[0084] Step S2: Mount the multiplexer component 5 with the second light emitting component 6 as the positioning reference.

[0085] Step S3: Fix the third light emitting component 9 in a coupled manner with the first light emitting component 8 and the second light emitting component 6 as the positioning references.

[0086] Step S4: Install the cooler 2 at a specified position within the housing 1.

[0087] Step S5: Mount the first light excitation component 3 with the corresponding wavelength on the cooler 2 with the input surface of the first light emitting component 8 as the positioning reference.

[0088] Step S6: Mount the second light excitation component 3 with the corresponding wavelength on the cooler 2 with the corresponding wavelength input port of the multiplexer component 5 as the positioning reference.

[0089] Specifically in the above Step S1, the first multiplexing prism and the second multiplexing prism can be installed and fixed within the housing 1 with the central axis of the optical window 101 of the housing 1 as the reference.

[0090] Specifically in the above Step S2, the isolator 7 and the multiplexer can be installed and fixed within the housing 1 respectively with the incident surface of the second multiplexing prism as the reference.

[0091] Specifically in the above Step S3, the third multiplexing prism can be fixed in a coupled manner with the first multiplexing prism and the second multiplexing prism as the positioning references.

[0092] Specifically in the above Step S5, the first light excitation component 3 with the corresponding wavelength can be mounted on the cooler 2 with the input surface of the second multiplexing prism as the positioning reference.

[0093] Specifically in the above Step S6, the second light excitation component correspondingly arranged with the inlet end 511 of the multiplexer can be fixed on the cooler 2 with the inlet end 511 of the multiplexer as the reference.

[0094] In Steps S5 and S6, before fixing the first light excitation component and the second light excitation component to the cooler 2, it further includes assembling the light excitation component 3 and obtaining the actual temperature and required drive current corresponding to the light beam with a 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 conditions, and combining with the actually required preset wavelength, and performing debugging to obtain the corresponding temperature and current when emitting the preset wavelength and preset optical power. In the above debugging process, the debugging principle is: when the current increases, the power increases and the wavelength becomes longer; when the temperature decreases, the power increases and the wavelength becomes shorter. After debugging, the light excitation component 3 is assembled and fixed to the cooler 2, and the light excitation component 3 and the cooler 2 are respectively wire-bonded to the corresponding pins of the housing 1 to achieve electrical connection.

[0095] In a specific embodiment, the above method further includes: Step S7, fixing the collimating lens 4.

[0096] In Step S7, during the process of fixing the collimating lens 4, it further includes debugging the collimating lens 4. Specifically, an electric current corresponding to the emission of a preset wavelength is applied to the optical excitation component 3 (this electric current is obtained through the debugging in Steps S5 and S6), and the cooler 2 is controlled to make the temperature of the optical excitation component 3 meet the requirements (this temperature is obtained through debugging). And an optical power meter or a beam quality analyzer is set at the optical window 101 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.

[0097] In Step S7, 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 multiplexers, thereby ensuring the gas detection accuracy and the balance of the wavelength measurement accuracies of each path.

[0098] Embodiment III

[0099] Based on the same inventive concept, this embodiment provides a gas detection device, including a housing and a detection unit, a gas chamber, and the gas detection optical device in Embodiment I provided inside the housing;

[0100] The gas chamber is arranged close to the third light emitting component and is used for accommodating the gas to be detected;

[0101] The detection unit is used to obtain the characteristic absorption spectrum of the gas to be detected.

[0102] 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 exact structure 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 also intends to include these changes and modifications.

Claims

1. A gas detection optical device, characterized in that: include: A housing and a first light emitting component, a second light emitting component, a third light emitting component, at least one wave combining component, a refrigerator, and a plurality of light excitation components arranged in the housing; The multiple light excitation components include multiple first light excitation components and multiple second light excitation components sequentially arranged on the refrigerator, and are used to excite light beams of different preset wavelengths, and the excited light beams are transmitted in the form of parallel light; the wavelength of the light beam excited by the first light excitation component is smaller than the wavelength of the light beam excited by the second light excitation component, and the multiple first light excitation components and the multiple second light excitation components can be turned on at different times; The first light emitting component is disposed on the path of the light beams excited by the plurality of first light excitation components, and is used for combining the light beams excited by the plurality of first light excitation components to obtain a first path of light and emit it to the third light emitting component; The wave combining component and the second light emitting component are sequentially arranged on the path of the light beams excited by the plurality of second light exciting components; The wave combining component is used to combine the light beams excited by at least two adjacent second light excitation components; The second light emitting component is used to combine the light beams combined by the combining component to obtain a second path of light and transmit it to the third light emitting component; A light window is provided in the light emitting direction of the housing, and the third light emitting component is arranged corresponding to the light window, and is used for combining the first light and the second light and emitting the combined light to the outside of the housing through the light window.

2. The gas detection optical device according to claim 1, characterized in that: The light excitation component includes a substrate and a light emitting chip and a thermistor arranged on the substrate, wherein the substrate is arranged on the refrigerator, the thermistor is arranged close to the light emitting chip, and the light emitting chip is used to excite a light beam of corresponding wavelength.

3. The gas detection optical device according to claim 2, characterized in that: Also included is 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.

4. The gas detection optical device according to claim 2, characterized in that: The second light emitting component includes a second wave combining prism; The second wave-combining prism comprises an incident surface and an output surface which are arranged opposite to each other. The incident surface is arranged toward the wave-combining component and is perpendicular to the light beam emitted by the wave-combining component.

5. The gas detection optical device according to claim 4, 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.

6. The gas detection optical device according to claim 5, 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.

7. The gas detection optical device according to claim 6, characterized in that: The number of the plurality of first light excitation components is two, and the number of the plurality of second light excitation components is six; The light emitting chips of each of the first light excitation components and the second light excitation components are arranged in parallel, so that the light beams excited by each of the light emitting chips are parallel to each other; The preset wavelengths of the light beams excited by the light emitting chips of each of the first light excitation components are respectively: 760nm, 1392nm, and the preset wavelengths of the light beams excited by the light emitting chips of each of the second light excitation components are respectively: 1529nm, 1565nm, 1579nm, 1630nm, 1650nm, 1680nm.

8. The gas detection optical device according to claim 7, 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.

9. A method for assembling a gas detection optical device, characterized in that: include: Using the central axis of the light window of the housing as a positioning reference, mounting the first light emitting component and the second light emitting component in the housing; Mounting the wave combiner component using the second light emitting component as a positioning reference; Using the first light emitting component and the second light emitting component as positioning references, fixing the third light emitting component in a coupling manner; Install the cooler at a designated position in the housing; Using the input surface of the first light emitting component as a positioning reference, attaching a first light excitation component of a corresponding wavelength on the refrigerator; The corresponding wavelength input port of the wavelength combining component is used as a positioning reference, and a second light excitation component of the corresponding wavelength is attached to the refrigerator.

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 8; The gas chamber is arranged close to the third light emitting component 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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