A gas detecting optical device and a gas detecting apparatus

Abstract

The utility model discloses a kind of gas detection optical devices and gas detection device, multiple light excitation components include sequentially arranged and set in the multiple first light excitation components and multiple second light excitation components of refrigerator, for exciting different preset wavelength light beam, and excited light beam is transmitted in parallel light form;Multiple first light excitation components and multiple second light excitation components can open in staggered time;First light exit component is arranged on the path of light beam excited by multiple first light excitation components, for obtaining first light emission to third light exit component by light beam combining wave;Combining wave component and second light exit component are sequentially arranged on the path of light beam excited by multiple second light excitation components;Combining wave component is used for combining wave to light beam;Second light exit component is used for obtaining second light emission to third light exit component by combining wave after light beam combining wave of combining wave component;Third light exit component is used for emitting to shell outside after combining wave to first light and second light.

Description

Technical Field

[0001] This utility model relates to the field of optical gas detection technology, and in particular to a gas detection optical device and a gas detection apparatus. Background Technology

[0002] Mid-infrared TDLAS (Tunable Diode Laser Absorption Spectroscopy) is a spectroscopic detection technique that uses the fundamental frequency vibration absorption of gas molecules in the mid-infrared band and the wavelength tunability of a diode laser to obtain the characteristic absorption spectrum of the gas under test with high resolution, thereby enabling quantitative analysis of the target gas.

[0003] In some application scenarios, such as industrial sensing, the gas composition is often complex, requiring the detection of multiple gas components. Existing solutions generally use multiple sets of gas detection equipment to detect the multiple components in the gas separately. Utility Model Content

[0004] To increase the options for gas detection methods and enrich the product range of gas detection devices, this utility model provides a gas detection optical device and a gas detection device.

[0005] In a first aspect, embodiments of the present invention provide a gas detection optical device, comprising:

[0006] The housing, and a first light emitting component, a second light emitting component, a third light emitting component, at least one beam combiner, a cooler, and multiple light excitation components disposed in the housing;

[0007] The plurality of photoexcitation components include a plurality of first photoexcitation components and a plurality of second photoexcitation components arranged sequentially in the cooler, for exciting 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 photoexcitation component is smaller than the wavelength of the light beam excited by the second photoexcitation component, and the plurality of first photoexcitation components and the plurality of second photoexcitation components can be turned on at different times.

[0008] The first light emitting component is disposed on the path of the light beam excited by the plurality of first light excitation components, and is used to combine the light beams excited by the plurality of first light excitation components to obtain a first light path and emit it to the third light emitting component.

[0009] The beam combining component and the second light emitting component are sequentially disposed on the path of the light beam excited by the plurality of second light excitation components;

[0010] The beam combining component is used to combine the beams excited by at least two adjacent second optical excitation components.

[0011] The second light emitting component is used to combine the beams combined by the beam combining component to obtain a second light path, which is then emitted to the third light emitting component.

[0012] The third light emission component is used to combine the first and second light beams and then emit them outside the housing.

[0013] In one or more optional embodiments, the light excitation assembly includes a substrate and 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 a light beam of a corresponding wavelength.

[0014] In one or more optional embodiments, the gas detection optical device further includes a collimating lens;

[0015] 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.

[0016] In one or more alternative embodiments, the first light emitting component includes a first wave combiner prism, which is a 45-degree wave combiner prism.

[0017] In one or more alternative embodiments, the second light emitting component includes a second beam combiner prism;

[0018] The second beam combiner includes an incident surface and an output surface arranged opposite to each other. The incident surface is positioned toward the beam combiner assembly and is perpendicular to the beam emitted by the beam combiner assembly.

[0019] In one or more alternative embodiments, the multiplexing assembly includes at least one multiplexer fixed within the housing;

[0020] The combiner includes an output terminal and multiple input terminals;

[0021] Each of the input terminals is configured to correspond one-to-one with the optical emitting chip;

[0022] The outlet end is positioned facing the incident surface of the converging prism.

[0023] In one or more optional embodiments, the gas detection optical device further includes at least one isolator fixed within the housing;

[0024] The isolator and the multiplexer are configured in a one-to-one correspondence;

[0025] The isolator is located between the combiner and the combiner prism.

[0026] In one or more optional embodiments, the number of the plurality of first photoexcitation components is two, and the number of the plurality of second photoexcitation components is six;

[0027] The light-emitting chips of each of the first and second light-excitation components are arranged in parallel so that the light beams excited by each light-emitting chip are parallel to each other;

[0028] The preset wavelengths of the light beams excited by the light emitting chips of each of the first light excitation components are 760nm and 1392nm, respectively, and the preset wavelengths of the light beams excited by the light emitting chips of each of the second light excitation components are 1529nm, 1565nm, 1579nm, 1630nm, 1650nm, and 1680nm, respectively.

[0029] In one or more alternative embodiments, the multiplexing assembly includes a first multiplexer and a second multiplexer;

[0030] The first beam combiner is configured to correspond to the optical emitting chip with preset wavelengths of 1529nm, 1565nm, and 1579nm for the beam;

[0031] The second beam combiner is configured to correspond to the optical emitting chip with preset wavelengths of 1630nm, 1650nm, and 1680nm for the light beam.

[0032] In a second aspect, this utility model 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 disposed within the housing;

[0033] The gas chamber is located near the third light emission component and is used to contain the gas to be tested.

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

[0035] The beneficial effects of the above-mentioned technical solutions provided in the embodiments of this utility model include at least the following:

[0036] This invention proposes a gas detection optical device. By incorporating multiple photoexcitation components in a cooler, the light beam is transmitted in a parallel light format, meeting the needs of long-distance gas detection while maintaining high detection accuracy even at long distances. Furthermore, different beam combining methods are employed depending on the wavelength of the emitted light. For beams with wavelengths that are not strongly absorbed by gases, a simple combining method is used; for beams with wavelengths that are strongly absorbed by gases, a combining component is used in conjunction with the light emitting component. By staggering the activation of different photoexcitation components, different components in multi-component gases can be detected, or different gases can be detected. Compared to existing technologies that use multiple gas detection devices to detect different components, this invention only requires a single gas detection optical device to detect different components in the gas. This significantly reduces the size, making it easier to carry and install. Moreover, by integrating multiple optical devices, product costs are saved, operation and maintenance are simplified, gas detection efficiency is improved, and resources and costs required for maintenance and calibration are reduced.

[0037] This invention proposes a gas detection optical device. By incorporating a cooler and placing a thermistor near each optical emitting chip, each thermistor measures the temperature of its corresponding optical emitting chip in real time and rapidly transmits this temperature to the cooler. This allows for quick response to temperature changes and adjustments. When the temperature exceeds a set threshold, the cooler activates and cools the chip until it returns to the normal range, meeting the temperature requirements. This achieves high-precision temperature control, ensuring the accuracy of the wavelength excited by the optical emitting chip and effectively guaranteeing the measurement accuracy of gas detection.

[0038] This invention places the thermistor on the substrate and close to the light-emitting chip. Compared to placing the thermistor and the substrate separately in the cooler, this invention allows the thermistor to be closer to the light-emitting chip, making it easier to obtain the temperature of the light-emitting chip in real time and accurately, thereby achieving precise temperature control of the light-emitting chip.

[0039] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0040] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0041] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0042] Figure 1 This is a schematic diagram of the structure of the gas detection optical device provided in an embodiment of the present invention;

[0043] Figure 2 This is an enlarged schematic diagram of the photoexcitation component;

[0044] 1. Housing; 101. Optical window; 2. Cooler; 3. Photoexcitation assembly; 31. Substrate; 32. Optical emitting chip; 33. Thermistor; 4. Collimating lens; 5. Wave combiner assembly; 51. First wave combiner; 511. Entrance end; 52. Second wave combiner; 6. Second optical emission assembly; 7. Isolator; 8. First optical emission assembly; 9. Third optical emission assembly. Detailed Implementation

[0045] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0046] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "far," "near," "front," and "rear," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] The inventors discovered that conventional techniques employ multiple gas detection devices to detect various components in a gas. Since each device only detects one gas component, multiple devices require significant space, and spectral detection is costly. Therefore, this embodiment provides a gas detection optical device and a gas detection apparatus.

[0049] Example 1

[0050] See Figure 1 and Figure 2 This embodiment provides a gas detection optical device, including: a housing 1, and a first light emitting component 8, a second light emitting component 6, a third light emitting component 9, at least one beam combiner 5, a cooler 2, and multiple light excitation components 3 disposed on the housing 1. Wherein:

[0051] The multiple light excitation components 3 include multiple first light excitation components and multiple second light excitation components arranged sequentially on the cooler 2, 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 multiple second light excitation components can be turned on at different times.

[0052] The first light emitting component 8 is disposed on the path of the light beams excited by the multiple first light excitation components, and is used to combine the light beams excited by the multiple first light excitation components to obtain a first light path for emission to the third light emitting component 9.

[0053] The beam combining component 5 and the second light emitting component 6 are sequentially arranged on the path of the light beam excited by the multiple second light excitation components.

[0054] The beam combiner 5 is used to combine beams excited by at least two adjacent second optical excitation components.

[0055] The second light emitting component 6 is used to combine the beams combined by the beam combining component 5 to obtain a second light path, which is then emitted to the third light emitting component 9.

[0056] The third light emission component 9 is used to combine the first and second light beams and then emit them outside the housing 1.

[0057] This invention proposes a gas detection optical device. By setting multiple photoexcitation components 3 in the cooler 2, the light beam is transmitted in a parallel light form, which can meet the needs of long-distance gas detection and ensure high detection accuracy even at long distances. Furthermore, different beam combining methods are used depending on the wavelength of the emitted light. For beams with wavelengths that are not strongly absorbed by gases, a simple combining method is used; for beams with wavelengths that are strongly absorbed by gases, a combining component 5 combined with a light emitting component is used. By activating different photoexcitation components 3 at staggered times, different components in multi-component gases can be detected, or different gases can be detected. Compared with the existing technology that uses multiple sets of gas detection equipment to detect different components in the gas, only one gas detection optical device is needed to complete the detection of different components in the gas. This not only greatly reduces the size, making it easier to carry and install, but also saves product costs by integrating multiple optical devices, making operation and maintenance simpler, improving gas detection efficiency, and reducing the resources and costs required for maintenance and calibration.

[0058] In this embodiment, the cooler 2 can be a thermoelectric cooler (TEC).

[0059] In this embodiment, a light window 101 is provided in the light emission direction of the housing 1, and a third light emission component 9 is provided corresponding to the light window 101. This component combines the first and second light beams and then emits them outside the housing 1 through the light window 101. In this embodiment, the structure and composition of the first and second light exciters can be the same or similar. (Refer to...) Figure 2 As shown, each light excitation component 3 includes a substrate 31 and a light emitting chip 32 and a thermistor 33 disposed on the substrate 31. The substrate 31 is disposed on the cooler 2, and the thermistor 33 is disposed close to the light emitting chip 32. The light emitting chip 32 is used to excite a light beam of a corresponding wavelength.

[0060] In use, the light-emitting chips 32 of each of the first light-excitation components excite light beams of different preset wavelengths. Multiple light beams are combined by the first light-emitting component 8 to obtain a first light path, which is then emitted to the third light-emitting component 9. Similarly, the light-emitting chips 32 of each of the second light-excitation components excite light beams of different preset wavelengths. All light beams pass through the multiplexing component 5, which combines the multiple beams. The combined beams then pass through the second light-emitting component 6, which further combines the combined beams to obtain a second light path, which is then emitted to the third light-emitting component 9. The third light-emitting component 9 combines the first and second light paths and then emits the light through the light window 101 to the outside of the housing 1.

[0061] The outer casing 1 can be filled with the gas to be detected. When the light beam is emitted to the outside of the casing 1, it passes through the gas. The gas molecules absorb infrared light of a specific wavelength within the light beam. By measuring the absorption spectrum of the gas to infrared light, the gas to be detected can be quantitatively analyzed to obtain its composition information. After the light beam is excited by the light emitting chip 32, it is transmitted in parallel form as it passes through the beam combining component 5, the light emitting component, and finally to the outside of the casing 1. That is, the light beam excited by the light emitting chip 32 can exit the casing 1 in parallel form, thus meeting the requirements for long-distance gas detection and ensuring high detection accuracy even under long-distance conditions.

[0062] In this embodiment, by integrating multiple light emitting chips 32 and detecting different components in a multi-component gas by activating the light emitting chips 32 at staggered times, or by realizing the function of detecting different gases, the detection of different components in a gas can be completed by setting up only one gas detection optical device, which is convenient for reducing size and saving costs.

[0063] The inventors discovered in their experiments that because multiple light-emitting chips 32 are integrated into a single device, they inevitably generate a large amount of heat when they are working. If the heat cannot be dissipated and the temperature cannot be controlled in time, the actual temperature requirements of the light beam of the specified wavelength will not be met, causing the wavelength of the light beam emitted by the light-emitting chip 32 to deviate from the required wavelength, failing to meet the requirements of stability and accuracy, and resulting in errors in the gas detection results.

[0064] Based on this, to ensure measurement accuracy, the inventors further designed a system that uses a cooler 2 and a thermistor 33 to achieve precise temperature control of the light-emitting chip 32. Connecting the output signal of the thermistor 33 to the cooler 2 automates temperature monitoring and control, improving the accuracy and efficiency of temperature control. Specifically, a thermistor 33 is positioned near each light-emitting chip 32, allowing multiple thermistors 33 to measure the temperature of each chip in real time and quickly transmit this temperature to the cooler 2. This enables rapid response to temperature changes and adjustments. When the temperature exceeds a set threshold, the cooler 2 activates and cools the chip until it returns to the normal range, achieving high-precision temperature control to ensure the accuracy of the wavelength excited by the light-emitting chip 32 and effectively guarantee the measurement accuracy of gas detection. Compared to the method of setting the thermistor 33 and the substrate 31 separately in the cooler 2, this 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 makes it easier to obtain the temperature of the light emitting chip 32 in real time and accurately, thereby achieving precise temperature control of the light emitting chip 32.

[0065] In one specific embodiment, see [reference] Figure 1The gas detection optical device also includes a collimating lens 4, which is disposed in the cooler 2, and the central axis of the collimating lens 4 is on the same axis as the light beam excited by the light emitting chip 32. For example, see reference... Figure 1 As shown, for the first optical excitation component 3, the collimating lens 4 is disposed at the light outlet of the light emitting chip 32 and is located on the axis of the beam excited by the light emitting chip 32. For the second optical excitation component 3, the collimating lens 4 is disposed between the wave combiner component 5 and the light emitting chip 32, and is located at the light outlet of the light emitting chip 32 and on the axis of the beam excited by the light emitting 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 that the beam is transmitted in a parallel light form. The central axis of the collimating lens 4 is on the same axis as the beam excited by the light emitting chip 32 to ensure that the beam can pass through the collimating lens 4 accurately and effectively, and form a parallel beam after refraction by the collimating lens 4, which can minimize the deflection and scattering of the beam, thereby improving the collimation and energy concentration of the beam.

[0066] In one specific embodiment, see [reference] Figure 1 The first light emitting component 8 includes a first wave combiner prism, which is a 45-degree wave combiner prism. The second light emitting component 6 includes a second wave combiner prism, which includes an incident surface (not shown in the figure) and an output surface (not shown in the figure) arranged opposite to each other. The incident surface is the surface where the light beam first enters the second wave combiner prism, and the output surface is the surface from which the light beam exits. Light beams of different wavelengths enter the second wave combiner prism from the incident surface, are combined into a single beam, and then emitted from the output surface of the second wave combiner prism. The housing 1 has a light window 101 facing the output surface. The incident surface is positioned facing the wave combiner component 5 and perpendicular to the light beam emitted by the wave combiner component 5 to ensure that the light beam is transmitted in the form of parallel light and can be combined into a parallel beam after passing through the second wave combiner prism. This meets the requirements for long-distance gas detection and ensures high detection accuracy even under long-distance conditions.

[0067] In one specific embodiment, see [reference] Figure 1 The beam combiner 5 includes at least one beam combiner fixed within the housing 1. Each beam combiner includes an outlet end (not shown) and multiple inlet ends 511. The inlet ends 511 correspond one-to-one with the light-emitting chips 32 of the second photoexcitation assembly, and the outlet ends face the incident surface of the beam combiner prism. The light beams excited by the light-emitting chips 32 of each second photoexcitation assembly are collimated by the collimating lens 4 and then enter the beam combiner through the inlet ends 511. Multiple beams of different preset wavelengths are combined within the beam combiner to more effectively detect the gas under test using different preset wavelength beams. The combined beams are then emitted from the outlet end of the beam combiner.

[0068] In one specific embodiment, see [reference] Figure 1 The gas detection optical device also includes at least one isolator 7 fixed inside the housing 1. The isolator 7 is located between the multiplexer and the second multiplexing prism. The number of isolators 7 is the same as the number of multiplexers, and the isolators 7 are arranged in a one-to-one correspondence with the multiplexers. That is, there is an isolator 7 between the second multiplexing prism and each multiplexer. The isolator 7 can optically isolate the reflected light generated during the transmission of the light beam, preventing the reflected light from returning to the optical emitting chip 32 and negatively affecting 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.

[0069] In one specific embodiment, see [reference] Figure 1 and Figure 2 The system comprises two first photoexcitation components 3 and six second photoexcitation components 3. The light-emitting chips 32 of each photoexcitation component 3 are arranged in parallel so that the light beams excited by each light-emitting chip 32 are mutually parallel. The preset wavelengths of the light beams excited by the light-emitting chips 32 of each first photoexcitation component 3 are 760nm and 1392nm, respectively, and the preset wavelengths of the light beams excited by the light-emitting chips 32 of each second photoexcitation component 3 are 1529nm, 1565nm, 1579nm, 1630nm, 1650nm, and 1680nm, respectively.

[0070] In one specific embodiment, see [reference] Figure 1 and Figure 2 The beam combining component 5 includes a first beam combiner 51 and a second beam combiner 52. The first beam combiner 51 is configured for light emitting chips 32 with preset wavelengths of 1529nm, 1565nm, and 1579nm, while the second beam combiner 52 is configured for light emitting chips 32 with preset wavelengths of 1630nm, 1650nm, and 1680nm. To ensure balanced measurement accuracy for each beam length, this embodiment uses a beam combiner for every three light emitting chips 32 (i.e., two beam combiners are used for the six light emitting chips 32). This helps to minimize the optical path difference between the light emitting chips 32, avoiding excessive optical path difference that could lead to high optical power loss and large beam spots, which would result in low measurement accuracy for long optical paths.

[0071] In one specific embodiment, reference is made to Figure 1 As shown, the first wave combiner prism is a 45-degree 2-wave combiner prism. The second wave combiner prism is a 45-degree 6-wave combiner prism, and the third wave combiner prism of the third light emitting component 9 is a 45-degree 8-wave combiner prism.

[0072] In one specific embodiment, see [reference] Figure 2 The substrate 31 serves as the receiving platform for the light-emitting chip 32, acting as a bridge between the light-emitting chip 32 and external circuits. The substrate 31 should possess low dielectric constant, low dielectric loss factor, and other excellent high-frequency electrical properties. The substrate 31 includes at least one of COC substrate, PTFE substrate, or ceramic substrate. The substrate 31 made of these three types of materials possesses the aforementioned excellent high-frequency electrical properties, which can ensure the operational stability of the light-emitting chip 32.

[0073] In one specific embodiment, see [reference] Figure 1 The gas detection optical device also includes an optical power meter (not shown in the figure) disposed in the optical window 101, which can detect the optical power of the beam. Before using the gas detection optical device to detect the gas to be tested, 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.

[0074] In one specific embodiment, see [reference] Figure 1 The gas detection optical device also includes a beam quality analyzer (not shown in the figure) disposed in the optical window 101. Before using the gas detection optical device to detect the gas to be tested, the gas detection optical device is calibrated using the beam quality analyzer. Specifically, the position of a single collimating lens 4 is moved until the measured light spot meets the requirements.

[0075] In this embodiment, the function of detecting different gas components in a single product can be achieved by controlling a single-channel light emitting chip 32 in a time-division manner. Specifically, the workflow involves first controlling the first-channel light emitting chip 32 to emit light of a specified wavelength and power (specifically achieved by applying corresponding temperature control current and drive current to the TEC and the light emitting chip 32), maintaining this position for a period of time (e.g., 15 minutes), and then starting detection. After detection is complete, the second-channel light emitting chip 32 is then controlled to emit light of a specified wavelength and power, and the above operation is repeated until gas detection is complete. Since temperature adjustment requires a certain amount of time, maintaining this position before gas detection ensures that the temperature and drive current of the light emitting chip 32 during gas detection meet the requirements with high precision, thus ensuring that the wavelength emitted by the light emitting chip 32 is sufficiently accurate and guaranteeing the accuracy of gas detection.

[0076] This embodiment also provides the following method for assembling the gas detection optical device:

[0077] Step S1: Using the central axis of the light window 101 of the housing 1 as the positioning reference, attach the first light emitting component 8 and the second light emitting component 6 inside the housing 1.

[0078] Step S2: Install the wave combining component 5 using the second light emitting component 6 as the positioning reference.

[0079] Step S3: Using the first light emitting component 8 and the second light emitting component 6 as positioning references, fix the third light emitting component 9 by coupling.

[0080] Step S4: Install the cooler 2 in the designated position inside the housing 1.

[0081] Step S5: Using the input surface of the first light emitting component 8 as the positioning reference, attach the first light excitation component 3 of the corresponding wavelength to the cooler 2.

[0082] Step S6: Using the corresponding wavelength input port of the wave combiner 5 as the positioning reference, attach the second optical excitation component 3 of the corresponding wavelength to the cooler 2.

[0083] Specifically, step S1 above may involve installing and fixing the first and second wave-combining prisms inside the housing 1, with the central axis of the light window 101 of the housing 1 as a reference.

[0084] Specifically, step S2 above can be performed by installing and fixing the isolator 7 and the wave combiner inside the housing 1, with the incident surface of the second wave combiner as the reference.

[0085] Specifically, step S3 above can involve fixing the third wave-combining prism by coupling, using the first and second wave-combining prisms as positioning references.

[0086] Specifically, step S5 above can be achieved by attaching the first light excitation component 3 of the corresponding wavelength to the cooler 2, using the input surface of the second wave-combining prism as the positioning reference.

[0087] Specifically, step S6 above may involve fixing a second photoexcitation component, which is correspondingly disposed on the entrance end 511 of the multiplexer, on the cooler 2, with the entrance end 511 of the multiplexer as a reference.

[0088] In steps S5 and S6, before fixing the first and second photoexcitation components to the cooler 2, the process further includes assembling the photoexcitation component 3 and obtaining the actual temperature and required driving current corresponding to the preset wavelength of the light beam excited by the photoemitting chip 32. Specifically, this involves measuring the initial emission wavelength of the photoemitting chip 32 under existing temperature and current conditions, combining this with the actual required preset wavelength, adjusting the settings, and obtaining the temperature and current corresponding to emitting the preset wavelength and preset optical power. During this adjustment process, the principle is: increased current leads to higher power and a longer wavelength; decreased temperature leads to higher power and a shorter wavelength. After adjustment, the photoexcitation component 3 is assembled and fixed to the cooler 2. The photoexcitation component 3 and the cooler 2 are then wired to the corresponding pins of the housing 1 to achieve electrical connection.

[0089] In one specific embodiment, the above method further includes: step S7, fixing the collimating lens 4.

[0090] In step S7, the process of fixing the collimating lens 4 also includes adjusting the collimating lens 4. Specifically, a current corresponding to the emission preset wavelength is applied to the photoexcitation component 3 (this current is obtained through the adjustments in steps S5 and S6), and the cooler 2 is controlled to ensure that the temperature of the photoexcitation component 3 meets the requirements (this temperature is obtained through adjustments). An optical power meter or beam quality analyzer is set at the light 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.

[0091] In step S7, fixing the collimating lens 4 is the last step in the gas detection optical device assembly method. It can meet the precise alignment between multiple multiplexers, thereby ensuring the gas detection accuracy and the balanced accuracy of each wavelength measurement.

[0092] Example 2

[0093] 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 1 disposed within the housing;

[0094] The gas chamber is positioned near the third light emission component to contain the gas to be tested;

[0095] The detection unit is used to obtain the characteristic absorption spectrum of the gas to be tested.

[0096] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. This disclosure is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims. Thus, if these modifications and variations of this utility model fall within the scope of the claims of this utility model and their equivalents, this utility model is also intended to include these modifications and variations.

Claims

1. A gas detection optical device, characterized in that, include: The housing, and a first light emitting component, a second light emitting component, a third light emitting component, at least one beam combiner, a cooler, and multiple light excitation components disposed in the housing; The plurality of photoexcitation components include a plurality of first photoexcitation components and a plurality of second photoexcitation components arranged sequentially in the cooler, for exciting 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 photoexcitation component is smaller than the wavelength of the light beam excited by the second photoexcitation component, and the plurality of first photoexcitation components and the plurality of second photoexcitation components can be turned on at different times. The first light emitting component is disposed on the path of the light beam excited by the plurality of first light excitation components, and is used to combine the light beams excited by the plurality of first light excitation components to obtain a first light path and emit it to the third light emitting component. The beam combining component and the second light emitting component are sequentially disposed on the path of the light beam excited by the plurality of second light excitation components; The beam combining component is used to combine the beams excited by at least two adjacent second optical excitation components. The second light emitting component is used to combine the beams combined by the beam combining component to obtain a second light path, which is then emitted to the third light emitting component. The third light emission component is used to combine the first and second light beams and then emit them outside the housing.

2. The gas detection optical device according to claim 1, characterized in that, The light excitation assembly includes a substrate and a light emitting chip and a thermistor disposed on the substrate. 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 a light beam of a corresponding wavelength.

3. The gas detection optical device according to claim 2, characterized in that, It also includes collimating lenses; 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.

4. The gas detection optical device according to claim 2, characterized in that, The first light emitting component includes a first wave combiner prism, which is a 45-degree wave combiner prism.

5. The gas detection optical device according to claim 2, characterized in that, The second light emitting component includes a second wave combiner prism; The second beam combiner includes an incident surface and an output surface arranged opposite to each other. The incident surface is positioned toward the beam combiner assembly and is perpendicular to the beam emitted by the beam combiner assembly.

6. The gas detection optical device according to claim 5, characterized in that, The multiplexing assembly includes at least one multiplexer fixed within the housing; The combiner includes an output terminal and multiple input terminals; Each of the input terminals is configured to correspond one-to-one with the optical emitting chip; The outlet end is positioned facing the incident surface of the converging prism.

7. The gas detection optical device according to claim 6, characterized in that, It also includes at least one isolator fixed within the housing; The isolator and the multiplexer are configured in a one-to-one correspondence; The isolator is located between the combiner and the combiner prism.

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

9. The gas detection optical device according to claim 8, characterized in that, The multiplexing assembly includes a first multiplexer and a second multiplexer; The first beam combiner is configured to correspond to the optical emitting chip with preset wavelengths of 1529nm, 1565nm, and 1579nm for the beam; The second beam combiner is configured to correspond to the optical emitting chip with preset wavelengths of 1630nm, 1650nm, and 1680nm for the light beam.

10. A gas detection device, characterized in that, Includes a housing and a detection unit, a gas chamber, and the gas detection optical device according to any one of claims 1-9, all disposed within the housing; The gas chamber is located near the third light emission component 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 tested.

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