CN213779874U - TDLAS-based multi-component gas analyzer - Google Patents
TDLAS-based multi-component gas analyzer Download PDFInfo
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- CN213779874U CN213779874U CN202022615853.XU CN202022615853U CN213779874U CN 213779874 U CN213779874 U CN 213779874U CN 202022615853 U CN202022615853 U CN 202022615853U CN 213779874 U CN213779874 U CN 213779874U
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Abstract
The utility model discloses a multicomponent gas analyzer based on TDLAS, it is including transmission drive module through the body analysis appearance, light path module and data reception processing module, transmission drive module includes temperature controller, first laser instrument, the second laser instrument, third laser instrument and driver, the light path module includes three channels change over switch module, laser collimator and long optical path gas absorption cell, data reception processing module is including the photoelectric detector who connects gradually, the amplifier submodule piece, data acquisition card and central processing unit, it is according to R1301, R125 and R134a spectral absorption peak position's difference, utilize TDLAS technique to realize the online qualitative and quantitative analysis of multicomponent freon gas, the present freon gas mixture detection device of fungible upgrading.
Description
Technical Field
The utility model belongs to gaseous detection area, more specifically relates to a multicomponent gas analyzer based on TDLAS.
Background
The existing Freon gas detection methods comprise mass spectrometry, gas chromatography, halogen leak detection, infrared spectroscopy and the like, and the mass spectrometry and the gas chromatography have high cost, large equipment size, troublesome operation and high professional requirement; the halogen leak detection method needs manual leak detection, cannot perform online monitoring, and cannot identify the type of mixed gas; infrared spectroscopy is currently under vigorous development and has great potential and advantages in the field of gas detection.
Tdlas (tunable Diode Laser Absorption spectroscopy), a tunable semiconductor Diode Laser Absorption spectroscopy technique, is one of the infrared spectroscopy techniques. The technology utilizes the narrow linewidth (generally less than 20mhz and far less than the absorption linewidth of a molecule) and wavelength tunable characteristic (the wavelength of the laser is allowed to scan a certain absorption line of a gas molecule), and realizes the measurement of single or several absorption lines of the molecule which are very close to each other and difficult to distinguish by scanning the absorption line of the gas molecule at high frequency. And deducing the concentration of target gas molecules according to the Lambert-Beer law. Based on the characteristics, the TDLAS technology has very strong anti-interference performance and very high sensitivity, and is one of the most sensitive technologies in the selective gas analysis technology. The united states space agency uses a multi-gas monitor (MGM) based on the TDLAS technology to successfully realize online monitoring of H2O, O2, CO2 and NH3 on a space station, with a calibration interval of more than 3 years, with accuracy comparable to any existing instrument, and with powerful monitoring capability of the TDLAS technology.
However, the current TDLAS instrument uses only a single laser source to perform the measurement of a single gas, and for a multi-component gas such as freon gas, the detection of the multi-component gas cannot be performed by the current TDLAS instrument because the absorption peak positions of different gases are different.
SUMMERY OF THE UTILITY MODEL
To at least one defect or improvement demand of prior art, the utility model provides a multicomponent gas analysis appearance based on TDLAS, its aim at solve present TDLAS instrument and only be used for the problem of the measurement of single gas.
To achieve the above objects, according to one aspect of the present invention, there is provided a TDLAS-based multi-component gas analyzer, the gas analyzer comprising a transmission driving module, a light path module and a data receiving and processing module, wherein,
the emission driving module comprises a temperature controller, a first laser, a second laser, a third laser and a driver, wherein the temperature controller is respectively connected with the first laser, the second laser and the third laser, and the driver is respectively connected with the first laser, the second laser and the third laser;
the light path module comprises a three-channel switch module, a laser collimator and a long-optical-path gas absorption pool, wherein an input port of the laser collimator is respectively butted with an output port of a first laser, an output port of a second laser and an output port of a third laser through the three-channel switch module, an output port of the laser collimator is butted with a light source input port of the long-optical-path absorption pool, and an air inlet pipe of the long-optical-path gas absorption pool is butted with gas to be monitored;
the data receiving and processing module comprises a photoelectric detector, an amplifier sub-module, a data acquisition card and a central processing unit which are connected in sequence.
As a further improvement of the present invention, the first laser, the second laser and the third laser are QCL quantum cascade lasers.
As a further improvement of the present invention, the center wavelength of the first laser is 8.33 μm, the center wavelength of the second laser is 11.9 μm, and the center wavelength of the first laser is 4.77 μm.
As a further improvement of the utility model, the temperature controller is a PCT temperature controller, and the sensitivity of the PCT temperature controller is 0.0012 ℃.
As a further improvement of the utility model, the laser collimator is an optical fiber collimator.
As a further improvement of the utility model, the long-optical-path gas absorption cell is a rectangular prism array type long-optical-path gas absorption cell.
As a further improvement of the present invention, the photodetector is a high-sensitivity pyroelectric detector, and the coverage band thereof includes 4 to 12 μm.
As a further improvement of the present invention, the amplifier sub-module comprises a preamplifier and a lock-in amplifier connected in sequence.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
(1) the utility model provides a pair of multicomponent gas analyzer based on TDLAS, it utilizes TDLAS technique to realize the gaseous online qualitative and quantitative analysis of multicomponent freon according to the difference of R1301, R125 and R134a spectral absorption peak position, and fungible upgrades current freon mist detection device, and is further, and it sets up three kinds of QCL lasers through parallelly connected to rotate and follow-up system connection, solved multicomponent gaseous measuring problem.
(2) The utility model provides a pair of multicomponent gas analysis appearance based on TDLAS, its long-range gas absorption cell adopts right angle prism array form, compares classic Herriot type, White type gas cell, and its sensitivity is high, and the shock resistance is strong, and the requirement ratio is lower to the environment, and is applicable to real-time measurement.
Drawings
Fig. 1 is a schematic structural diagram of a TDLAS-based multi-component gas analyzer according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a long optical path gas absorption cell provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
The structure and the operation principle of the TDLAS-based multi-component gas analyzer according to the present invention will be described in detail with reference to the following embodiments and the accompanying drawings.
Fig. 1 is a schematic structural diagram of a multicomponent gas analyzer based on TDLAS that the embodiment of the present invention provides. As shown in fig. 1, a TDLAS-based multi-component gas analyzer includes an emission driving module, an optical path module, and a data reception processing module, wherein,
the emission driving module comprises a temperature controller, a first laser, a second laser, a third laser and a driver, wherein the temperature controller is respectively connected with the first laser, the second laser and the third laser, and the driver is respectively connected with the first laser, the second laser and the third laser; preferably, the first laser, the second laser and the third laser are connected in parallel, the three lasers can be switched and driven at regular time by the drivers in the detection process, and the temperature controller is used for controlling the temperature of the first laser, the second laser and the third laser, so that the stability of the output wavelength of the light source is ensured, and the test precision is ensured. Preferably, the first Laser, the second Laser and the third Laser are all QCL Quantum Cascade lasers (Quantum Cascade lasers), further, the central wavelength of the first Laser is 8.33 μm, the central wavelength of the second Laser is 11.9 μm, the central wavelength of the first Laser is 4.77 μm, the driving system mainly generates a driving signal of the QCL Quantum Cascade Laser, and the QCL Laser is driven to generate a modulated Laser signal near the absorption peak of the freon gas to be detected, so that online monitoring of three freon gases (R125, R134a, R1301) can be realized, the absorption peak of R125 is 8.33 μm, the absorption peak of R134a is 11.9 μm, and the absorption peak of R1301 is 4.77 μm. Preferably, the temperature controller is a PCT temperature controller developed by wavetength, which can control the temperature fluctuation at 0.0012 ℃. The emission driving module is provided with a first laser, a second laser and a third laser according to the difference of spectral absorption peak positions of R1301, R125 and R134a, so that the subsequent modules can realize the online qualitative and quantitative analysis of the multi-component Freon gas by using the TDLAS technology, and the current Freon mixed gas detection device can be upgraded.
The optical path module comprises a three-channel switch module, a laser collimator and a long-optical-path gas absorption cell, wherein an input port of the laser collimator is respectively butted with an output port of a first laser, an output port of a second laser and an output port of a third laser through the three-channel switch module, the output port of the laser collimator is butted with a light source input port of the long-optical-path absorption cell, an air inlet pipe of the long-optical-path gas absorption cell is butted with gas to be monitored, preferably, the three lasers are switched by the three-channel switch module at regular time to be butted with the laser collimator, the laser collimator is used for modulating laser emitted by the QCL laser into incident laser with consistent light beams, and further, the laser collimator is an optical fiber collimator of Terahertzla company bs and has the advantages of simplicity in assembly and small size; the long-optical-path gas absorption cell achieves the purposes of optical path increase and energy loss in the gas chamber by utilizing the reflection of light and the convergence action of the spherical mirror. Fig. 2 is a schematic structural diagram of a long optical path gas absorption cell provided in an embodiment of the present invention. As shown in fig. 2, preferably, the long-path gas absorption cell is a rectangular prism array type long-path gas absorption cell, the optical path is greatly increased by multiple reflections of the rectangular prism array, and the structure is relatively simple, so that the mirror processing pressure can be greatly reduced compared with the conventional White cell and Herriott cell. Furthermore, the long-optical-path gas absorption cell is provided with a gas inlet pipe, a gas outlet pipe and a gas flow regulating valve, and the online monitoring function can be realized by acquiring gas flow data in real time. Compared with classical Herriot type and White type gas tanks, the long-optical-path gas absorption tank is high in sensitivity, strong in shock resistance and low in environmental requirement and is suitable for real-time measurement by adopting a right-angle prism array form.
The data receiving and processing module comprises a photoelectric detector, an amplifier sub-module, a data acquisition card and a central processing unit which are sequentially connected, wherein an input port of the photoelectric detector is in butt joint with an output port of the long-optical-path gas absorption cell, received laser signals are converted into electric signals through the photoelectric detector, the amplifier, the data acquisition card and the central processing unit respectively, and then the electric signals are amplified and subjected to noise reduction processing to facilitate processing and deduction of a subsequent central processing unit. Preferably, the photoelectric detector is a DLATGS detector, is a novel high-sensitivity pyroelectric detector, has the sensitivity reaching the sub-ppm level, can well cover a to-be-detected waveband (4-12 mu m), and is provided with a temperature control unit to ensure high sensitivity and stability. Preferably, the amplifier sub-module comprises a preamplifier and a lock-in amplifier which are connected in sequence.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A TDLAS-based multi-component gas analyzer is characterized in that the gas analyzer comprises an emission driving module, an optical path module and a data receiving and processing module, wherein,
the emission driving module comprises a temperature controller, a first laser, a second laser, a third laser and a driver, wherein the temperature controller is respectively connected with the first laser, the second laser and the third laser, and the driver is respectively connected with the first laser, the second laser and the third laser;
the optical path module comprises a three-channel switch module, a laser collimator and a long-optical-path gas absorption pool, wherein an input port of the laser collimator is respectively butted with an output port of a first laser, an output port of a second laser and an output port of a third laser through the three-channel switch module, the output port of the laser collimator is butted with a light source input port of the long-optical-path absorption pool, and an air inlet pipe of the long-optical-path gas absorption pool is butted with gas to be monitored;
the data receiving and processing module comprises a photoelectric detector, an amplifier sub-module, a data acquisition card and a central processing unit which are connected in sequence.
2. The TDLAS-based multi-component gas analyzer of claim 1, wherein the first, second and third lasers are QCL quantum cascade lasers.
3. The TDLAS-based multi-component gas analyzer of claim 1, wherein the first laser has a center wavelength of 8.33 μ ι η, the second laser has a center wavelength of 11.9 μ ι η, and the first laser has a center wavelength of 4.77 μ ι η.
4. A TDLAS-based multi-component gas analyzer as claimed in claim 1 wherein the temperature controller is a PCT temperature controller with a sensitivity of 0.0012 ℃.
5. The TDLAS-based multi-component gas analyzer of claim 1, wherein the laser collimator is a fiber collimator.
6. The TDLAS-based multi-component gas analyzer of claim 1, wherein the long path gas absorption cell is a rectangular prism array type long path gas absorption cell.
7. The TDLAS-based multi-component gas analyzer of claim 1, wherein said photodetector is a high sensitivity pyroelectric detector with a coverage band comprised between 4 and 12 μm.
8. The TDLAS-based multi-component gas analyzer of claim 1, wherein the amplifier sub-module comprises a preamplifier and a lock-in amplifier connected in series.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114047132A (en) * | 2022-01-11 | 2022-02-15 | 山东省科学院激光研究所 | Long-optical-path gas absorption cell for multi-gas detection |
| CN114047134A (en) * | 2022-01-13 | 2022-02-15 | 山东省科学院激光研究所 | Long-optical-path gas absorption cell based on multilayer structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114047132A (en) * | 2022-01-11 | 2022-02-15 | 山东省科学院激光研究所 | Long-optical-path gas absorption cell for multi-gas detection |
| CN114047134A (en) * | 2022-01-13 | 2022-02-15 | 山东省科学院激光研究所 | Long-optical-path gas absorption cell based on multilayer structure |
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