Self-calibration method of tdlas gas detection system

A gas detection system and detection system technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems that special calibration equipment is difficult to meet, and achieve the effect of low cost

Active Publication Date: 2018-01-30
北京光感慧智科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 gas detection system
  • Self-calibration method of tdlas gas detection system
  • Self-calibration method of tdlas gas detection system

Examples

Experimental program
Comparison scheme
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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 back,

[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 present application discloses a self-calibration method of a TDLAS gas detection system. According to the calculation formula of Beer-Lambert's law, the first incident laser light corresponding to the frequency of the target gas is generated according to the gas absorption spectrum, and the first incident laser light is input to the optical path switching device. , the first incident laser light enters the designated standard gas chamber through the optical path switching device, and the first transmitted laser light is obtained after being absorbed by the target gas in the designated standard gas chamber; after the conversion of the first transmitted laser light, the digital electrical signal of the amplitude of the first transmitted laser light is obtained ; And accordingly calculate the light intensity value I01 of the first incident laser and the light intensity value It1 of the first transmitted laser light; Based on the above two light intensity values, introduce the gas content C0 in the known standard gas chamber, and invert the target The calculation coefficient of gas concentration α·L1 is the product of the gas absorption coefficient α used in the TDLAS gas detection system and the standard gas chamber length L1. This method can automatically calibrate the calculation coefficient α·L1 of the 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] [0004] In the above formula, C is the concentration of the gas to be measured, and I t It is the transmitted light intensity after passing thro...

Claims

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Application Information

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