Gas chamber device for measuring concentrations of various trace gases
Patent Information
- Application Number
- CN202610034311.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-12
- Publication Date
- 2026-02-27
Smart Images
Figure CN121577543A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of gas detection technology, and more specifically to a gas chamber device for measuring the concentration of various trace gases. Background Technology
[0002] Trace gas concentration detection is of great significance in industrial production, environmental protection, safety monitoring, and medical testing. Existing optical gas detection technologies are based on the principle of characteristic gas absorption spectroscopy, meaning that different gases selectively absorb light at specific wavelengths, and gas concentration is calculated by measuring the degree of light absorption. For example, carbon monoxide corresponds to a mid-infrared absorption peak at 4.5-5 μm, methane to a near-infrared absorption peak at 1.65-3.31 μm, and ammonia to an ultraviolet absorption peak at 190-230 nm.
[0003] However, existing optical sensors generally suffer from a "one-to-one" detection limitation, meaning a single gas chamber device can only detect one specific gas. To achieve multi-gas detection, traditional solutions require stacking multiple independent single-gas chambers, each equipped with a dedicated light source, filter, detector, and optical structure. This results in low system integration, large size, and high manufacturing costs. Furthermore, the types of gases detected are fixed at the factory, preventing flexible expansion based on field requirements and limiting practicality.
[0004] Therefore, developing an integrated, miniaturized, low-cost, and flexibly adaptable gas chamber device for multi-gas detection has become an urgent technical problem to be solved in this field. Summary of the Invention
[0005] In order to achieve accurate detection of multiple trace gases in a single gas chamber and solve the problems of redundancy, high cost and poor flexibility of traditional multi-gas detection systems, this application provides a gas chamber device for measuring the concentration of multiple trace gases.
[0006] The gas chamber device for measuring the concentration of various trace gases provided in this application adopts the following technical solution: A gas chamber device for measuring the concentration of multiple trace gases includes a gas chamber cavity, on which a first mounting base and a second mounting base are mounted. An inlet and an outlet are respectively formed on the sidewalls of the gas chamber cavity near its two ends. A modulation wheel assembly and a light source assembly are mounted inside the first mounting base. A mounting plate is fixedly mounted inside the second mounting base, on which a filter assembly and a detector assembly are mounted. An incident lens assembly is sealed and mounted on the sidewall of the gas chamber cavity corresponding to the modulation wheel assembly, and an exit lens assembly is sealed and mounted on the sidewall of the gas chamber cavity corresponding to the filter assembly. The gas chamber cavity contains an outlet lens assembly and an outlet lens assembly. The exit lens assembly includes a reflector assembly; the light source assembly includes multiple light sources of different wavelengths; the modulation wheel assembly includes two modulation cavities, one of which is filled with a reference gas, and the other is filled with two or more target gases; or, the modulation wheel assembly includes multiple modulation cavities, one or more of which contain a reference gas, and the remaining modulation cavities are each filled with one or more target gases; the filter assembly includes multiple narrowband filters; and a control assembly is also included, which is electrically connected to the modulation wheel assembly, the light source assembly, the filter assembly, and the detector assembly.
[0007] By adopting the above technical solution, the light source component and modulation wheel component are integrated into the first mounting base, and the filter component and detector component are integrated into the second mounting base, forming a modular layout. Together with the reflector component inside the gas chamber, the multi-gas detection function of a single gas chamber is realized. By controlling the component to coordinate the operation of each component synchronously, the light source of different bands, the corresponding filter and the modulation wheel cavity are precisely matched. This not only avoids the redundant structure of traditional multi-chamber stacking, but also ensures detection accuracy through the collaboration of multiple components, greatly reducing hardware costs and device size, while also having the ability to flexibly expand the types of gases to be detected.
[0008] Furthermore, the modulation wheel assembly includes a modulation wheel, which is rotatably connected inside the first mounting base, and the modulation cavity is formed on the modulation wheel; a drive shaft is fixedly connected to the center of the modulation wheel, and a first drive component electrically connected to the control component is fixedly installed inside the first mounting base, and the first drive component is drively connected to the drive shaft.
[0009] By adopting the above technical solution, the modulation wheel can be adapted to both reference requirements and the detection of multiple target gases simultaneously. The sealed structure ensures the purity of the gas inside the cavity and avoids cross-contamination. The first driving component drives the modulation wheel to rotate precisely under the control of the control component, realizing the rapid switching between the reference modulation cavity and each target gas cavity. This provides a stable modulation basis for the time-division detection of different gases, and the number of cavities can be flexibly expanded, improving the applicability of the device.
[0010] Furthermore, the light source assembly includes a light source mounting plate, which is rotatably connected inside the first mounting base. The light source mounting plate has multiple radially equidistant light source mounting holes corresponding to the incident lens assembly. Light sources adapted to different target gas measurement requirements are respectively installed inside the light source mounting holes. A detachable first cover is installed at the outer end of the first mounting base. An electrical connector is fixedly installed on the first cover. The electrical connector has fixed contacts that are electrically connected to the control component. Moving contacts are fixedly installed on the light source corresponding to the fixed contacts. A second driving component, electrically connected to the control component, is fixedly installed inside the first mounting base. The second driving component is drively connected to the light source mounting plate.
[0011] By adopting the above technical solutions, the radial equidistant design of the light source mounting plate ensures precise alignment with the incident lens assembly when the light source is switched; the cooperation between the fixed contact and the moving contact ensures stable power supply when the light source is switched, avoiding detection interruption caused by poor contact; the second driving component drives the light source mounting plate to rotate under the control of the control component, which can quickly switch the excitation light source to adapt to different target gases, and the modular design of the light source mounting plate facilitates the addition or replacement of light sources in the future, improving the expansion flexibility of the device.
[0012] Furthermore, a first position sensor and a second position sensor are respectively mounted on the side wall of the first mounting base corresponding to the modulation wheel assembly and the light source assembly, and the first position sensor and the second position sensor are electrically connected to the control assembly.
[0013] By adopting the above technical solution, the first position sensor monitors the rotation position of the modulation wheel in real time, and the second position sensor monitors the position status of the light source mounting plate and feeds the position signal back to the control component. This enables the control component to accurately control the start, stop and rotation angle of the first and second driving components, ensuring the synchronous alignment of the light source, modulation wheel, modulation cavity and subsequent filter, avoiding detection errors caused by position deviation, and improving the accuracy of the system's collaborative work.
[0014] Furthermore, the filter assembly includes a third driving component electrically connected to the control component. The third driving component is fixedly mounted on the mounting plate. A driving disk is fixedly mounted at one end of the driving shaft of the third driving component that extends to the bottom of the mounting plate. A switching wheel is fixedly mounted on the driving disk. The switching wheel has multiple filter mounting holes corresponding to the output lens assembly. A filter is fixedly mounted inside each filter mounting hole. The center wavelength of each filter corresponds to the characteristic absorption band of a target gas.
[0015] By adopting the above technical solution, the filter on the switching wheel is precisely matched with the characteristic absorption band of each target gas, which can effectively filter out interference light in non-target bands and improve the selectivity of the detection signal. The third driving component drives the switching wheel to rotate under the control of the control component, realizing the rapid and accurate switching of the filter. It is also synchronized with the switching of the light source and the modulation wheel to ensure that the optimal optical filtering conditions can be obtained when detecting each target gas, thus ensuring the detection accuracy.
[0016] Furthermore, the detector assembly includes a detector electrically connected to the control assembly, the detector being configured as a multi-band compatible photodetector, and the detector being fixedly mounted on the mounting plate at a position corresponding to the exit lens assembly.
[0017] By adopting the above technical solutions, the multi-band compatible photodetector has high sensitivity and high response speed. It can accurately capture weak light signals after they have passed through the gas chamber and been filtered by the filter, and convert them into stable electrical signals. The precise alignment of the detector and the output lens assembly ensures effective reception of the light signal and avoids signal loss. At the same time, the design of a single detector simplifies the system structure, avoids the signal consistency problem caused by multiple detectors, and reduces system complexity and cost.
[0018] Furthermore, the incident lens assembly includes a first lens, and a first lens mounting hole is provided on the air chamber cavity corresponding to the first lens. A first lens sealing inner gasket and a first lens sealing outer gasket are installed inside the first lens mounting hole. The first lens is installed inside the first lens mounting hole at a position between the first lens sealing inner gasket and the first lens sealing outer gasket. A first lens pressure plate is installed on the side wall of the air chamber cavity corresponding to the first lens sealing outer gasket.
[0019] By adopting the above technical solution, the first lens plays the role of converging the light from the light source and improving the light utilization rate; the combination design of the double sealing gasket and the lens pressure plate ensures the sealing performance of the first lens installation location, prevents the gas to be tested from leaking into the gas chamber, and avoids the entry of external environmental gas from affecting the test results, thus ensuring the stability of the test environment and the accuracy of the test data.
[0020] Furthermore, the outgoing lens assembly includes a second lens, and a second lens mounting hole is provided on the air chamber corresponding to the second lens. A second lens sealing inner gasket and a second lens sealing outer gasket are installed inside the second lens mounting hole. The second lens is installed inside the second lens mounting hole at a position between the second lens sealing inner gasket and the second lens sealing outer gasket. The second mounting seat fixedly installed on the air chamber abuts against the second lens sealing outer gasket.
[0021] By adopting the above technical solution, the second lens can focus the light signal reflected and transmitted through the gas chamber cavity, ensuring that the light signal is accurately injected into the detector and improving the signal reception efficiency; the abutment design of the double sealing gasket and the second mounting base realizes the reliable sealing of the second lens mounting point, and together with the incident lens assembly, forms the overall sealing structure of the gas chamber cavity, further ensuring the stability of the gas environment in the cavity and reducing the detection error caused by leakage.
[0022] Furthermore, the reflector assembly includes an entrance reflector and an exit reflector. An entrance reflector mounting hole is provided on the air chamber near the entrance lens assembly, and an entrance reflector mounting base is sealed inside the entrance reflector mounting hole. The entrance reflector is fixedly mounted on the entrance reflector mounting base. An exit reflector mounting hole is provided on the air chamber near the exit lens assembly, and an exit reflector mounting base is sealed inside the exit reflector mounting hole. The exit reflector is fixedly mounted on the exit reflector mounting base. A front end cover and a rear end cover are fixedly and sealed at both ends of the air chamber. A first reflector is fixedly mounted on the end of the front end cover near the interior of the air chamber, and a second reflector is fixedly mounted on the end of the rear end cover near the interior of the air chamber.
[0023] By adopting the above technical solution, the entrance reflector, exit reflector, first reflector, and second reflector form a multi-reflection optical path design, which significantly extends the propagation path of light in the gas chamber cavity, increases the optical path, and allows the light to fully interact with the gas to be detected, thereby improving the detection sensitivity of trace gases. The sealed mounting base design of each reflector ensures the airtightness of the gas chamber cavity, while the fixed installation method of the reflectors ensures the stability of the optical path and avoids changes in the optical path caused by reflector offset, further improving the detection accuracy.
[0024] Furthermore, the control component includes a control circuit board, on which a microcontroller chip and a signal transceiver module are integrated. The control circuit board is electrically connected to the modulation wheel assembly, the light source assembly, the filter assembly, and the detector assembly.
[0025] By adopting the above technical solution, the microcontroller chip, as the core control unit, can receive feedback signals from the position sensor and accurately drive each driving component to achieve synchronous switching of the light source, modulation wheel, and filter. At the same time, it processes and calculates the electrical signals transmitted by the detector to obtain the target gas concentration. The signal transceiver module supports data transmission and command reception, and can realize remote setting of detection mode or real-time uploading of detection data, thereby improving the ease of operation and intelligence level of the device.
[0026] Beneficial effects achieved: This application utilizes a modular integrated design to organically combine a multi-band light source, a multi-cavity modulation wheel, switchable filters, a single gas chamber, and a detector. Combined with the coordinated control of the control components, it successfully achieves accurate detection of multiple trace gases within a single gas chamber, completely solving the problems of cumbersome structure, large size, and high cost associated with traditional multi-gas detection systems. The device achieves precise synchronous switching of each component through position sensors. Combined with the long optical path design of the multi-reflector and the double-sealed structure, it ensures high detection accuracy and anti-interference capabilities. Simultaneously, the modular component design and expandable modulation cavity, light source, and filter configuration allow the device to flexibly add or remove detection gas types according to actual needs without requiring a complete hardware replacement, greatly improving application flexibility and adaptability. Furthermore, the shared design of the single detector simplifies the system structure, reduces hardware costs and maintenance difficulty, and is suitable for various scenarios such as industrial environmental monitoring, outdoor emergency detection, and special gas detection in chemical industrial parks, possessing broad practical value and promising prospects for widespread application. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the overall structure of one embodiment of this application.
[0028] Figure 2 This is a structural exploded view of one embodiment of this application.
[0029] Figure 3 This is a schematic diagram of the internal structure of one embodiment of this application.
[0030] Figure 4 This is an exploded view of the modulation wheel assembly and the light source assembly in one embodiment of this application.
[0031] Figure 5 This is an exploded view of the structure of the filter assembly and the detector assembly in one embodiment of this application.
[0032] Figure 6 This is an exploded view of the incident lens assembly in one embodiment of this application.
[0033] Figure 7 This is an exploded view of the output lens assembly in one embodiment of this application.
[0034] Figure 8 This is an exploded view of the structure of a reflector assembly in one embodiment of this application.
[0035] Explanation of reference numerals in the attached drawings: 100, air chamber; 101, first mounting base; 102, second mounting base; 103, air inlet; 104, air outlet; 105, mounting plate; 106, first position sensor; 107, second position sensor; 200, modulation wheel assembly; 201, modulation wheel; 202, modulation cavity; 203, drive shaft; 204, first driving element; 205, first driving gear; 206, first driven gear; 207, first tooth. 300. Toothed belt; 301. Light source assembly; 302. Light source mounting plate; 303. Light source mounting hole; 304. First cover; 305. Electrical connector; 306. Fixed contact; 307. Moving contact; 308. Second drive element; 309. Second drive gear; 310. Second driven gear; 311. Second toothed belt; 400. Filter assembly; 401. Third drive element; 402. Drive plate; 403. Switching wheel; 404. Filter Mounting hole; 405, Filter; 500, Detector assembly; 501, Detector; 502, Detector mounting plate; 600, Incident lens assembly; 601, First lens; 602, First lens mounting hole; 603, First lens sealing gasket; 604, First lens sealing gasket; 605, First lens pressure plate; 700, Outgoing lens assembly; 701, Second lens; 702, Second lens mounting hole; 703, Second lens sealing gasket; 70 4. Second lens sealing gasket; 800. Reflector assembly; 801. Injection reflector; 802. Ejection reflector; 803. Injection reflector mounting hole; 804. Injection reflector mounting base; 805. Ejection reflector mounting hole; 806. Ejection reflector mounting base; 807. Front cover; 808. Rear cover; 809. First reflector; 810. Second reflector; 900. Control assembly; 901. Control circuit board; 902. Microcontroller chip. Detailed Implementation
[0036] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.
[0037] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0038] In the description of this application, it should be noted that, unless otherwise expressly 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0039] This application discloses a gas chamber device for measuring the concentration of various trace gases.
[0040] Please refer to the above as well. Figures 1 to 8 In one embodiment of this application, a gas chamber device for measuring the concentration of multiple trace gases includes a gas chamber cavity 100. A first mounting base 101 and a second mounting base 102 are mounted on the gas chamber cavity 100. An inlet hole 103 and an outlet hole 104 are respectively opened on the sidewalls of the gas chamber cavity 100 near its two ends. A modulation wheel assembly 200 and a light source assembly 300 are installed inside the first mounting base 101. A mounting plate 105 is fixedly mounted inside the second mounting base 102. A filter assembly 400 and a detector assembly 500 are mounted on the mounting plate 105. An incident lens assembly 600 is sealed and mounted on the sidewall of the gas chamber cavity 100 corresponding to the modulation wheel assembly 200. An exit lens assembly 700 is sealed and mounted on the sidewall of the gas chamber cavity 100 corresponding to the filter assembly 400. The gas chamber cavity 100 contains an incident lens assembly 600. The assembly 600 and the exit lens assembly 700 are provided with a mirror assembly 800 for increasing the optical path; the light source assembly 300 is provided with multiple semiconductor light sources of different wavelengths; the modulation wheel assembly 200 contains two modulation cavities 202, one of which is filled with a reference gas, and the other is filled with two or more target gases; or, the modulation wheel assembly 200 contains multiple modulation cavities 202, one or more of which contain a reference gas, and each of the remaining modulation cavities 202 is filled with one or more target gases; the filter assembly 400 is provided with multiple narrowband filters; and a control assembly 900 is also included, which is electrically connected to the modulation wheel assembly 200, the light source assembly 300, the filter assembly 400, and the detector assembly 500.
[0041] During operation, the control component 900 synchronously drives the light source component 300, modulation wheel component 200, and filter component 400 to switch to the working state adapted to the target gas according to the preset detection requirements. The gas to be detected enters the gas chamber cavity 100 through the air inlet 103 and is filled. The specific wavelength light emitted by the light source component 300 is modulated by the modulation wheel component 200 and focused by the incident lens component 600 before entering the gas chamber cavity 100. Under the action of the reflector component 800, the optical path is extended and it fully interacts with the gas to be detected. Subsequently, the light is focused by the exit lens component 700 and filtered by the filter component 400 before being received by the detector component 500 and converted into an electrical signal. The control component 900 combines the signal of the reference modulation cavity in the modulation wheel component 200 to process and calculate the electrical signal to obtain the target gas concentration. After the detection is completed, the gas is discharged through the air outlet 104, realizing the time-division accurate detection of multiple trace gases in a single gas chamber.
[0042] In one specific embodiment of this application, the reference gas includes nitrogen, and the target gas includes carbon monoxide, methane, ammonia, hydrogen, hydrogen sulfide, and mixtures thereof.
[0043] Please refer to the above as well. Figures 1 to 8 In one specific embodiment of this application, the modulation wheel assembly 200 includes a modulation wheel 201 with a multi-cavity sealing structure. The modulation wheel 201 is rotatably connected inside the first mounting base 101, and a modulation cavity 202 is formed on the modulation wheel 201. A drive shaft 203 is fixedly connected to the center of the modulation wheel 201. A first drive member 204 electrically connected to the control assembly 900 is fixedly installed inside the first mounting base 101. The first drive member 204 is drively connected to the drive shaft 203. A first driving gear 205 is fixedly installed on the first drive member 204, and a first driven gear 206 is fixedly installed on the drive shaft 203. A first toothed belt 207 meshes and drives between the first driving gear 205 and the first driven gear 206.
[0044] During operation, the control component 900 sends a drive command to the first drive component 204, which drives the first active gear 205 to rotate. The first driven gear 206 and the drive shaft 203 rotate synchronously through the first toothed belt 207, thereby driving the modulation wheel 201 to rotate precisely. When detecting a target gas, the modulation wheel 201 rotates until the corresponding target gas cavity is aligned with the optical path. At the same time, it periodically switches to the nitrogen reference modulation cavity to provide a reference signal for detection, realize the comparison between the target gas signal and the reference signal, and reduce environmental interference. The centrally symmetrical modulation cavity design ensures the dynamic balance of the modulation wheel 201 during rotation. The toothed belt drive improves the rotation accuracy and stability, and the sealed modulation cavity structure avoids gas leakage or cross-contamination inside the modulation cavity.
[0045] Please refer to the above as well. Figures 1 to 8In one specific embodiment of this application, the light source assembly 300 includes a light source mounting plate 301, which is rotatably connected inside the first mounting base 101. The light source mounting plate 301 is coaxially arranged with the modulation wheel 201 in the modulation wheel assembly 200. The light source mounting plate 301 has multiple radially equidistant light source mounting holes 302 corresponding to the incident lens assembly 600. Multiple light sources 303 are respectively installed inside the light source mounting holes 302. The light sources 303 include mid-infrared light sources, near-infrared light sources, and ultraviolet light sources, respectively adapted to the measurement requirements of different target gases. A detachable first cover 304 is installed at the outer end of the first mounting base 101. 4. An electrical connector 305 is fixedly installed on the light source 303. The electrical connector 305 is provided with a fixed contact 306 that is electrically connected to the control component 900. A moving contact 307 is fixedly installed on the light source 303 corresponding to the fixed contact 306. A second drive component 308 that is electrically connected to the control component 900 is fixedly installed inside the first mounting base 101. The second drive component 308 is connected to the light source mounting plate 301. A second drive gear 309 is fixedly installed on the second drive component 308. A second driven gear 310 is provided on the light source mounting plate 301 corresponding to the second drive gear 309. A second toothed belt 311 is meshing and connected between the second drive gear 309 and the second driven gear 310.
[0046] During operation, the control component 900 sends a switching command to the second drive component 308 according to the target gas type. The second drive component 308 drives the second drive gear 309 to rotate, which in turn drives the second driven gear 310 and the light source mounting plate 301 to rotate synchronously via the second toothed belt 311. This rotates the light source 303, which is adapted to the target gas, into the optical path aligned with the incident lens assembly 600. Simultaneously, the moving contact 307 on the light source 303 makes precise contact with the fixed contact 306 on the electrical connector 305. The control component 900 supplies power to the light source 303 through the fixed contact 306, enabling it to emit light of the corresponding wavelength. The coaxial arrangement ensures that the light source and the modulation cavity of the modulation wheel are aligned in the optical path. The radially equidistant mounting hole design improves the switching positioning accuracy. The toothed belt drive ensures rotational stability. The detachable first cover facilitates the maintenance and replacement of the light source.
[0047] Please refer to the above as well. Figures 1 to 8 In one specific embodiment of this application, a first position sensor 106 and a second position sensor 107 are respectively installed on the side wall of the first mounting base 101 corresponding to the modulation wheel 201 in the modulation wheel assembly 200 and the light source mounting plate 301 in the light source assembly 300. The first position sensor 106 and the second position sensor 107 are electrically connected to the control component 900.
[0048] During operation, the first position sensor 106 monitors the rotation position of the modulation wheel 201 in real time. When the target modulation cavity or reference modulation cavity of the modulation wheel 201 rotates to the optical path position, the first position sensor 106 sends an engagement signal to the control component 900. The second position sensor 107 synchronously monitors the rotation position of the light source mounting plate 301. When the target light source 303 is aligned with the optical path, it sends an engagement signal to the control component 900. Based on the feedback signals from the two position sensors, the control component 900 precisely controls the start and stop of the first drive component 204 and the second drive component 308 to ensure the synchronous alignment of the light source, the modulation wheel, the modulation cavity, and the subsequent filter. This avoids optical signal loss or detection errors caused by positional deviations and significantly improves the accuracy of the system's collaborative operation.
[0049] Please refer to the above as well. Figures 1 to 8 In one specific embodiment of this application, the filter assembly 400 includes a third driving member 401 electrically connected to the control assembly 900. The third driving member 401 is fixedly mounted on the mounting plate 105. The drive shaft of the third driving member 401 extends through to one end of the bottom of the mounting plate 105 and a driving disk 402 is fixedly mounted thereon. A switching wheel 403 is fixedly mounted on the driving disk 402. The switching wheel 403 has multiple filter mounting holes 404 corresponding to the output lens assembly 700. Filters 405 are fixedly mounted inside each filter mounting hole 404. The center wavelength of each filter 405 corresponds to the characteristic absorption band of a target gas.
[0050] During operation, the control component 900 sends a drive command to the third drive component 401 based on the target gas being detected. The third drive component 401 drives the drive disk 402 and the switching wheel 403 to rotate precisely, switching the filter 405, which matches the characteristic absorption band of the target gas, into the optical path between the output lens assembly 700 and the detector assembly 500. The filter 405 can accurately filter out interference light in the output optical signal of the gas chamber cavity 100 that is not in the target band, allowing only the optical signal with the characteristic absorption wavelength of the target gas to pass through, ensuring the purity of the optical signal received by the detector assembly 500 and improving the selectivity and accuracy of the detection. The third drive component 401 operates synchronously with the light source assembly 300 and the modulation wheel assembly 200 to achieve precise matching of "light source-modulation cavity-filter".
[0051] Please refer to the above as well. Figures 1 to 8 In one specific embodiment of this application, the first driving component 204, the second driving component 308, and the third driving component 401 are all micro stepper motors, and the micro stepper motors are electrically connected to the control component 900.
[0052] During operation, the micro stepper motor can achieve precise positioning without feedback signals. Combined with the feedback signals from the first and second position sensors, it forms a closed-loop control, further improving rotational accuracy and stability. Its low power consumption, rapid response, and smooth operation not only meet the design requirements of device integration and miniaturization, but also satisfy the efficient detection rhythm of time-sharing switching of multiple components, ensuring the accuracy and reliability of the entire system working together.
[0053] The control component 900 controls the rotation angle and speed of the first, second, and third micro stepper motors respectively by outputting precise pulse drive signals: The micro stepper motor corresponding to the first driving component 204 precisely adjusts the rotation step distance according to the number of pulses of the control signal, driving the modulation wheel 201 to achieve precise alignment between the target cavity and the optical path. The controllability of the step distance angle ensures that the cavity switching positioning error is extremely small, which is suitable for the multi-cavity time-sharing operation requirements.
[0054] After receiving the pulse signal, the micro stepper motor corresponding to the second driving component 308 drives the light source mounting plate 301 to rotate. By precisely controlling the number of rotation steps, the target light source 303 is accurately switched to the optical path position and synchronized with the fixed contact 306, ensuring stable power supply to the light source and accurate light incidence.
[0055] The micro stepper motor corresponding to the third driving component 401 drives the switching wheel 403 to rotate according to the control signal. By matching the number of pulses and the step angle, the target filter 405 can quickly and accurately enter the optical path and form a synchronous adaptation with the light source, modulation wheel, and modulation cavity.
[0056] Please refer to the above as well. Figures 1 to 8 In one specific embodiment of this application, the detector assembly 500 includes a detector 501 electrically connected to the control assembly 900. The detector 501 is configured as a multi-band compatible photodetector, such as a Hamamatsu G8371-01 or Thorlabs PDA36A-EC, whose performance parameters can respond to a wavelength range of 190nm-5μm, including the ultraviolet, near-infrared, and mid-infrared regions, and is adapted to the characteristic absorption band of the target gas; the detectivity D*(25℃, 1kHz) ≥ 1×10 10 cm·Hz 1 / 2 ·W -1 (Equivalent noise power NEP≤1×10) -10 W / Hz 1 / 2 It can accurately capture the subtle changes in light signals after the action of trace gases; the response time is ≤1μs, which is suitable for the efficient detection rhythm of multi-component time-sharing; the dark current is ≤1nA, which effectively reduces noise interference; the detector 501 is fixedly installed on the mounting plate 105 at the position corresponding to the output lens assembly 700 by screw locking through the detector fixing plate 502.
[0057] During operation, the light signal, after being acted upon by the gas chamber 100, converged by the exit lens assembly 700, and filtered by the filter 405, is precisely incident on the photosensitive area of the multi-band compatible photodetector 501. The detector 501 converts the light signal into an electrical signal corresponding to the light intensity and transmits it to the control assembly 900 in real time. The screw-locking method ensures the accuracy and stability of the detector 501's installation position, avoiding signal reception deviations caused by vibration or displacement. The multi-band compatible photodetector's core performance characteristics—wide response band, high detectivity, fast response, and low dark current—provide a high signal-to-noise ratio and high reliability signal foundation for trace gas concentration calculation.
[0058] Please refer to the above as well. Figures 1 to 8 In one specific embodiment of this application, the incident lens assembly 600 includes a first lens 601. A first lens mounting hole 602 is provided on the air chamber 100 corresponding to the first lens 601. A first lens sealing inner gasket 603 and a first lens sealing outer gasket 604 are installed inside the first lens mounting hole 602. The first lens 601 is installed inside the first lens mounting hole 602 at a position between the first lens sealing inner gasket 603 and the first lens sealing outer gasket 604. A first lens pressure plate 605 is fixedly installed on the side wall of the air chamber 100 corresponding to the first lens sealing outer gasket 604 by screw locking.
[0059] During operation, the light emitted by the light source assembly 300 is directed towards the first lens 601. The first lens 601 converges the diverging light, causing the light to enter the gas chamber cavity 100 in a concentrated beam form, thereby improving the utilization rate of light energy and ensuring that the light fully interacts with the gas to be detected. The inner sealing gasket 603 and the outer sealing gasket 604 of the first lens are tightly fitted to both sides of the first lens 601, and are pressed and fixed by the first lens pressure plate 605 to form a double sealing structure. This effectively prevents the gas to be detected from leaking into the gas chamber cavity 100, while also preventing external ambient gas from entering the cavity and interfering with the detection, thus ensuring the stability of the gas environment inside the gas chamber cavity 100.
[0060] Please refer to the above as well. Figures 1 to 8 In one specific embodiment of this application, the outgoing lens assembly 700 includes a second lens 701. A second lens mounting hole 702 is provided on the air chamber 100 corresponding to the second lens 701. A second lens sealing inner gasket 703 and a second lens sealing outer gasket 704 are installed inside the second lens mounting hole 702. The second lens 701 is installed inside the second lens mounting hole 702 at a position between the second lens sealing inner gasket 703 and the second lens sealing outer gasket 704. A second mounting seat 102 fixedly installed on the air chamber 100 abuts against the second lens sealing outer gasket 704.
[0061] During operation, the light rays inside the gas chamber 100, after being reflected multiple times by the reflector assembly 800, are directed towards the second lens 701. The second lens 701 converges the divergent light rays into a parallel beam, which is then precisely directed into the subsequent filter assembly 400 and detector assembly 500, reducing the divergence loss of the light signal and improving the signal reception efficiency of the detector 501. The inner sealing gasket 703 and the outer sealing gasket 704 of the second lens achieve a seal at the mounting point of the second lens 701. The abutting design of the second mounting base 102 further enhances the sealing effect. Together with the incident lens assembly 600, they form an overall seal of the gas chamber 100, ensuring a stable gas concentration inside the chamber and preventing data distortion caused by leakage.
[0062] Please refer to the above as well. Figures 1 to 8 In one specific embodiment of this application, the reflector assembly 800 includes an incident reflector 801 and an exit reflector 802. An incident reflector mounting hole 803 is provided on the air chamber 100 near the incident lens assembly 600. An incident reflector mounting base 804 is sealed inside the incident reflector mounting hole 803, and the incident reflector 801 is fixedly mounted on the incident reflector mounting base 804. An exit reflector is provided on the air chamber 100 near the exit lens assembly 700. The mirror mounting hole 805 has an ejector mirror mounting base 806 sealed inside it. The ejector mirror 802 is fixedly mounted on the ejector mirror mounting base 806. The two ends of the gas chamber 100 are respectively fixedly and sealed with a front cover 807 and a rear cover 808. A first reflector 809 is fixedly mounted on the end of the front cover 807 near the inside of the gas chamber 100, and a second reflector 810 is fixedly mounted on the end of the rear cover 808 near the inside of the gas chamber 100.
[0063] During operation, light enters the gas chamber 100 through the incident lens assembly 600, and is first reflected by the incident reflector 801 to the first reflector 809. Then, it is reflected multiple times by the first reflector 809 and the second reflector 810, and finally reflected by the exit reflector 802 to the exit lens assembly 700. The multiple reflections significantly extend the propagation distance of the light in the gas chamber 100, allowing the light to fully contact and be absorbed by the trace gas to be detected, thus significantly improving the detection sensitivity. The sealing design of the incident reflector mounting base 804 and the exit reflector mounting base 806 ensures the airtightness of the gas chamber 100, and the fixed installation method of each reflector ensures the stability of the optical path and avoids changes in optical path or deviation caused by reflector offset.
[0064] Please refer to the above as well. Figures 1 to 8In one specific embodiment of this application, the control component 900 includes a control circuit board 901, on which a microcontroller chip 902 and a signal transceiver module are integrated. The control circuit board 901 is electrically connected to the first position sensor 106 and the second position sensor 107, as well as the first drive member 204 in the modulation wheel assembly 200, the fixed contact 306 and the second drive member 308 in the light source assembly 300, the third drive member 401 in the filter assembly 400, and the detector 501 in the detector assembly 500.
[0065] During operation, the microcontroller chip 902, acting as the core control unit, receives position feedback signals from the first position sensor 106 and the second position sensor 107, and accurately outputs drive commands to the first drive unit 204, the second drive unit 308, and the third drive unit 401, achieving synchronous switching of the light source 303, the modulation wheel modulation cavity, and the filter 405. Simultaneously, it supplies power to the currently operating light source 303 through the fixed contact 306, receives electrical signals transmitted by the detector 501, and, combined with the reference signal from the nitrogen reference modulation cavity in the modulation wheel assembly 200, calculates the target gas concentration using a time-series separation detection method. The signal transceiver module supports communication with external host computers and mobile terminal devices, can receive external detection commands such as switching detection gases and adjusting detection frequencies, and upload detection data, realizing intelligent control and data sharing of the device.
[0066] The implementation principle of a gas chamber device for measuring the concentration of multiple trace gases according to an embodiment of this application is as follows: The gas to be detected enters the gas chamber cavity 100 through the inlet 103 and is stably filled. The control component 900 starts the coordinated operation of each component according to a preset detection sequence or external command. First, the control component 900 drives the second drive component 308 to rotate the light source mounting plate 301, switching the light source 303 adapted to the target gas to the optical path and supplying power through the fixed contact 306. At the same time, it drives the first drive component 204 to rotate the modulation wheel 201, aligning the corresponding target gas cavity with the optical path, and periodically switching to the nitrogen reference modulation cavity. The specific wavelength light emitted by the light source 303 is modulated by the modulation wheel 201, and then converged into the gas chamber cavity 100 through the incident lens assembly 600. Under the multiple reflections of the reflector assembly 800, the optical path is extended, and it fully interacts with the gas to be detected. The light is then focused by the exit lens assembly 700, and the control assembly 900 synchronously drives the third drive unit 401 to switch to the corresponding filter 405. After filtering out interference light, the light is received by the detector 501 and converted into an electrical signal. The control assembly 900 processes and calculates the electrical signal in conjunction with the reference signal to obtain the target gas concentration, which is then output through the signal transceiver module. After the detection of one gas is completed, the control assembly 900 drives each component to synchronously switch to the adaptation state for the next gas, repeating the above process to achieve time-division and accurate detection of multiple trace gases in a single gas chamber 100. The gas after detection is completed is discharged through the gas outlet 104. The entire process solves the problems of redundancy and high cost of traditional multi-gas detection systems through modular integration and synchronous control. At the same time, the sealing structure, long optical path design and precise alignment mechanism ensure detection accuracy and anti-interference capability.
[0067] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A gas chamber device for measuring the concentration of various trace gases, characterized in that: The system includes an air chamber (100), on which a first mounting base (101) and a second mounting base (102) are mounted. An air inlet (103) and an air outlet (104) are respectively opened on the sidewalls of the air chamber (100) near its two ends. A modulation wheel assembly (200) and a light source assembly (300) are installed inside the first mounting base (101). A mounting plate (105) is fixedly installed inside the second mounting base (102). A filter assembly (400) and a detector assembly (500) are mounted on the mounting plate (105). An incident lens assembly (600) is sealed and installed on the sidewall of the air chamber (100) corresponding to the modulation wheel assembly (200). An exit lens assembly (700) is sealed and installed on the sidewall of the air chamber (100) corresponding to the filter assembly (400). The air chamber (100) is further enclosed by an incident lens assembly (600) corresponding to the incident lens assembly (600). The 0) and the output lens assembly (700) are provided with a reflector assembly (800); the light source assembly (300) is provided with multiple light sources of different wavelengths; the modulation wheel assembly (200) contains two modulation cavities (202), one of which is filled with a reference gas and the other is filled with two or more target gases; or, the modulation wheel assembly (200) contains multiple modulation cavities (202), one or more of which contain a reference gas and the remaining modulation cavities (202) are each filled with one or more target gases; the filter assembly (400) is provided with multiple narrowband filters; and a control assembly (900) is also included, which is electrically connected to the modulation wheel assembly (200), the light source assembly (300), the filter assembly (400), and the detector assembly (500).
2. The gas chamber device for measuring the concentration of multiple trace gases according to claim 1, characterized in that: The modulation wheel assembly (200) includes a modulation wheel (201), which is rotatably connected inside the first mounting base (101). The modulation cavity (202) is formed on the modulation wheel (201). A drive shaft (203) is fixedly connected to the center of the modulation wheel (201). A first drive member (204) electrically connected to the control assembly (900) is fixedly installed inside the first mounting base (101). The first drive member (204) is drively connected to the drive shaft (203).
3. The gas chamber device for measuring the concentration of multiple trace gases according to claim 1, characterized in that: The light source assembly (300) includes a light source mounting plate (301), which is rotatably connected to the inside of the first mounting base (101). The light source mounting plate (301) has multiple radially equidistant light source mounting holes (302) corresponding to the incident lens assembly (600). Light sources (303) adapted to different target gas measurement requirements are respectively installed inside the light source mounting holes (302). A detachable first cover (304) is installed at the outer end of the first mounting base (101). An electrical connector (305) is fixedly installed on the first cover (304). The electrical connector (305) is provided with a fixed contact (306) that is electrically connected to the control component (900). A moving contact (307) is fixedly installed on the light source (303) corresponding to the fixed contact (306). A second driving component (308) that is electrically connected to the control component (900) is fixedly installed inside the first mounting base (101). The second driving component (308) is connected to the light source mounting plate (301) in a transmission connection.
4. The gas chamber device for measuring the concentration of multiple trace gases according to claim 1, characterized in that: The first mounting base (101) has a first position sensor (106) and a second position sensor (107) mounted on its sidewall corresponding to the modulation wheel assembly (200) and the light source assembly (300), respectively. The first position sensor (106) and the second position sensor (107) are electrically connected to the control assembly (900).
5. A gas chamber device for measuring the concentration of multiple trace gases according to claim 1, characterized in that: The filter assembly (400) includes a third drive unit (401) electrically connected to the control assembly (900). The third drive unit (401) is fixedly mounted on the mounting plate (105). The drive shaft of the third drive unit (401) extends through to one end of the bottom of the mounting plate (105) and a drive disk (402) is fixedly mounted thereon. A switching wheel (403) is fixedly mounted on the drive disk (402). The switching wheel (403) has multiple filter mounting holes (404) corresponding to the output lens assembly (700). A filter (405) is fixedly mounted inside each filter mounting hole (404). The center wavelength of each filter (405) corresponds to the characteristic absorption band of a target gas.
6. The gas chamber device for measuring the concentration of multiple trace gases according to claim 1, characterized in that: The detector assembly (500) includes a detector (501) electrically connected to the control assembly (900), the detector (501) being configured as a multi-band compatible photodetector, and the detector (501) being fixedly mounted on the mounting plate (105) at a position corresponding to the output lens assembly (700).
7. The gas chamber device for measuring the concentration of multiple trace gases according to claim 1, characterized in that: The incident lens assembly (600) includes a first lens (601). A first lens mounting hole (602) is provided on the air chamber (100) corresponding to the first lens (601). A first lens sealing inner gasket (603) and a first lens sealing outer gasket (604) are installed inside the first lens mounting hole (602). The first lens (601) is installed inside the first lens mounting hole (602) at a position between the first lens sealing inner gasket (603) and the first lens sealing outer gasket (604). A first lens pressure plate (605) is installed on the side wall of the air chamber (100) corresponding to the first lens sealing outer gasket (604).
8. A gas chamber device for measuring the concentration of multiple trace gases according to claim 1, characterized in that: The outgoing lens assembly (700) includes a second lens (701). A second lens mounting hole (702) is provided on the air chamber (100) corresponding to the second lens (701). A second lens sealing inner gasket (703) and a second lens sealing outer gasket (704) are installed inside the second lens mounting hole (702). The second lens (701) is installed inside the second lens mounting hole (702) at a position between the second lens sealing inner gasket (703) and the second lens sealing outer gasket (704). The second mounting seat (102) fixedly installed on the air chamber (100) abuts against the second lens sealing outer gasket (704).
9. A gas chamber device for measuring the concentration of multiple trace gases according to claim 1, characterized in that: The mirror assembly (800) includes an entrance mirror (801) and an exit mirror (802). An entrance mirror mounting hole (803) is provided on the air chamber (100) near the entrance lens assembly (600). An entrance mirror mounting base (804) is sealed inside the entrance mirror mounting hole (803). The entrance mirror (801) is fixedly mounted on the entrance mirror mounting base (804). An exit mirror mounting hole (805) is provided on the air chamber (100) near the exit lens assembly (700). An ejector mirror mounting base (806) is sealed inside the ejector mirror mounting hole (805). The ejector mirror (802) is fixedly mounted on the ejector mirror mounting base (806). A front end cover (807) and a rear end cover (808) are fixedly and sealed at both ends of the air chamber (100). A first reflector (809) is fixedly mounted on one end of the front end cover (807) near the inside of the air chamber (100). A second reflector (810) is fixedly mounted on one end of the rear end cover (808) near the inside of the air chamber (100).
10. A gas chamber device for measuring the concentration of multiple trace gases according to claim 1, characterized in that: The control component (900) includes a control circuit board (901), on which a microcontroller chip (902) and a signal transceiver module are integrated. The control circuit board (901) is electrically connected to the modulation wheel assembly (200), the light source assembly (300), the filter assembly (400), and the detector assembly (500).