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Self-calibration method of TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas detection system

A gas detection system and detection system technology, which are applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of insufficiency of special calibration equipment, and achieve the effect of low cost

Active Publication Date: 2014-08-06
北京光感慧智科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 1) It is necessary to purchase and use special calibration equipment for maintenance, and the calibration equipment needs to be operated by professionals;
[0007] 2) Due to the calculation coefficient α·L 1 Changes with temperature, so it is necessary to calibrate the calculation coefficient α L in the system frequently 1 data, dedicated calibration equipment is difficult to meet such needs

Method used

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  • Self-calibration method of TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas detection system
  • Self-calibration method of TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas detection system
  • Self-calibration method of TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas detection system

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Embodiment 1

[0028] Embodiment 1 discloses a self-calibration method of a distributed TDLAS gas detection system, which is applied to a TDLAS gas detection system, please refer to figure 1 , the detection system includes a laser emitting and converting receiving part 200, a testing and analyzing device 100, an optical path switching device 300, and at least one standard gas chamber 430; wherein each standard gas chamber is filled with a target gas.

[0029] Please refer to figure 2 , the calculation coefficient α L of the target gas concentration in the self-calibrating detection system 1 , the method used includes the following steps:

[0030] S101, the optical path switching device 300 receives an instruction to detect the concentration of the target gas in the designated standard gas chamber, and adjusts its optical path communication with the designated standard gas chamber 430;

[0031] S102, the laser emitting and converting receiving part 200 determines the center position of the...

Embodiment 2

[0058] Example 2, please refer to figure 1 The TDLAS gas detection system using this method further includes at least one measuring gas chamber 410, which is connected to the output end 320 of the optical path switching device.

[0059] Please refer to Figure 5 , the method in embodiment 2 also includes the step of measuring the target gas concentration in the specified measurement gas chamber: taking the measurement of the target gas concentration of NO gas in the measurement gas chamber 410 as an example, the TDLAS gas detection system corresponding to NO Calculation coefficient of gas concentration α·L 1 Rear,

[0060] S201, the optical path switching device 300 receives an instruction for detecting the concentration of NO gas in the measurement gas chamber 410; adjusts the optical path communication between the optical path switching device 300 and the measurement gas chamber 410;

[0061] S202, the laser emitting and converting receiving part 200 determines the center...

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Abstract

The invention discloses a self-calibration method of a TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas detection system. The self-calibration method comprises the following steps: according to a calculation formula of a Beer-Lambert principle, inputting first incident laser, corresponding to the frequency of target gas generated by a gas absorption spectrum, into an optical path switching device, and absorbing the first incident laser, entering an appointed standard gas chamber after passing through the optical path switching device, by target gas in the appointed standard gas chamber to obtain first transmission laser; converting the first transmission laser to obtain a digital electric signal about the amplitude of the first transmission laser; according to the digital electric signal, calculating to obtain a light intensity value I01 of the first incident laser and a light intensity value It1 of first transmission laser; and based on the two light intensity values and with introduction of the known gas content C0 in the standard gas chamber, inverting a calculation coefficient alpha*L1 of target gas concentration, namely the product of a gas absorption coefficient alpha and standard gas chamber length L1 of the TDLAS gas detection system. The method can be used for performing self-calibration on the calculation coefficient alpha*L1 of target gas in the system.

Description

technical field [0001] The application belongs to the technical field of gas concentration measurement, and in particular relates to a self-calibration method of a TDLAS gas detection system. Background technique [0002] As a method for measuring gas concentration, TDLAS (Tunable Diode Laser Absorption Spectroscopy, Tunable Diode Laser Absorption Spectroscopy) measurement method is a non-contact measurement method in which the photodetector and other components are not in contact with the analyzed gas. Due to the advantages of high spectral resolution, high sensitivity, and good environmental adaptability, this measurement method has been widely used. When the laser passes through the gas to be measured, the concentration of the gas to be measured can be described by the calculation formula of the Beer-Lambert law as [0003] C = - 1 αL · log I t ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 周笑春
Owner 北京光感慧智科技有限公司
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