Distributed TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas detection system and method

A gas detection system and distributed technology, applied in the direction of measurement device, analysis material, color/spectral characteristic measurement, etc., can solve the cost of purchase and use, high equipment maintenance cost, laser emission and conversion receiving part and test and analysis device Low use efficiency, expensive laser emission and conversion receiving parts, etc., to achieve the effect of being conducive to popularization and improving use efficiency

Active Publication Date: 2014-07-30
北京光感慧智科技有限公司
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Problems solved by technology

[0004] When the existing TDLAS detection system detects the target gas concentration in each measurement gas chamber, each measurement gas chamber needs to be equipped with a complete set of TDLAS gas detection system corresponding to the measurement gas chamber; relative to the measurement gas chamber, the laser emits Much more expensive than the conversion receiving part and the test and analysis setup
[0005] Therefore, based on the above reasons, the existing TDLAS g

Method used

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  • Distributed TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas detection system and method
  • Distributed TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas detection system and method
  • Distributed TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas detection system and method

Examples

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Embodiment 2

[0041] Example 2, please refer to figure 2 , the laser emitting and converting receiving part 200 includes a phase-locked amplifier 210, an analog / digital signal converting device 220, one or more laser devices, a circulator device 240 correspondingly connected to each laser device, and each laser device respectively The corresponding photoelectric sensing device 250. figure 2 The thick line in the figure represents the electrical connection, and the thin line represents the optical connection.

[0042] The laser device generates incident laser light for measuring the concentration of the target gas according to instructions from the test and analysis device 100, and the frequency of the incident laser light is determined according to the frequency of the center position of the target gas absorption peak in the gas absorption spectrum; figure 2 The laser emitting and converting receiving part 200 in the laser comprises a NO gas laser device 232, which emits a laser of a fr...

Embodiment 4

[0057] Embodiment 4, the TDLAS gas detection system in this embodiment has the same structure as the detection system in Embodiment 3, please refer to Figure 4 After the transmission laser is converted in embodiment 3, the step of obtaining the digital electrical signal of the transmission laser amplitude specifically includes:

[0058] S3041. Use the photoelectric sensing device 252 to perform optical / electrical conversion on the received transmitted laser light, to obtain an analog electrical signal of the transmitted laser light;

[0059] S3042. Use the lock-in amplifier 260 to demodulate the transmitted laser analog electrical signal to obtain harmonic amplitude information of the analog electrical signal;

[0060] S3043. Use the analog / digital signal conversion device 270 to perform analog / digital conversion on the harmonic amplitude information to obtain a digital electrical signal of the transmitted laser amplitude.

[0061] The laser emission and conversion receiving...

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Abstract

The invention discloses a distributed TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas detection system and a distributed TDLAS gas detection method. The gas detection system comprises a laser emitting, converting and receiving part, a testing and analyzing device, an optical path switching device and no less than two measuring air chambers, wherein the optical path switching device is used for introducing incident laser light from the laser emitting, converting and receiving part into the optical path of a specified measuring air chamber in the measuring air chambers according to a command from the testing and analyzing device; gas to be detected can be introduced into the measuring air chambers, incident laser light is reflected repeatedly in the measuring air chambers and is absorbed by target gas to form transmitted laser light which is reflected back into the optical path switching device; the optical path switching device is used for introducing transmitted laser light received from the specified measuring air chamber into the laser emitting, converting and receiving part. Thus, the target gas concentration of each measuring air chamber can be detected by configuring a plurality of measuring air chambers at different positions in one set of TDLAS gas detection system, the comprehensive cost of the TDLAS gas detection system is reduced, and the use efficiency of the system is increased.

Description

technical field [0001] The application belongs to the technical field of gas concentration measurement, and in particular relates to a distributed TDLAS gas detection system and method. Background technique [0002] As a method for measuring gas concentration values, TDLAS (Tunable Diode Laser Absorption Spectroscopy) measurement method is a non-contact measurement method in which photodetectors and other components are not in contact with the gas being analyzed . [0003] When using the TDLAS measurement method to measure the concentration of gas, the incident laser light whose wavelength is modulated according to a certain frequency f is introduced into the measuring gas chamber containing one or more target gases to be analyzed, and the gas sensing and measuring device is used to measure the concentration of the gas. A photoelectric sensing device detects the optical power of the transmitted laser light that has passed through the gas and returned. The gas to be measure...

Claims

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Application Information

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IPC IPC(8): G01N21/39G01N21/01
Inventor 周笑春
Owner 北京光感慧智科技有限公司
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