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Scaling method of laser gas analysis system

An analysis system, laser gas technology, applied in the calibration field of laser gas analysis system, can solve the problems of unreliable test results, unstable performance, difficult sample processing, etc., and achieve the effect of easy acquisition, low cost, and no environmental pollution

Active Publication Date: 2006-07-19
FOCUSED PHOTONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of poor safety, inconvenient operation, high cost, difficult sample handling, unreliable test results, and poor Insufficiencies such as difficulty in obtaining gas; the present invention provides a safe, economical and convenient calibration method for laser gas analysis systems

Method used

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  • Scaling method of laser gas analysis system
  • Scaling method of laser gas analysis system
  • Scaling method of laser gas analysis system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] figure 1 It is a schematic diagram of the calibration device structure of a laser gas analysis system. The laser light emitted by the light emitting unit 8 passes through the gas sample in the calibration gas chamber 5 and is received by the light receiving unit 3. The received signal is transferred at the light emitting unit 8 through the cable 2, and then sent to the signal analysis unit 1 through the cable 9. The gas source 7 is connected to the gas inlet 6 of the calibration gas chamber 5 through the valve 10, and the gas sample is discharged from the gas outlet 4.

[0038] figure 2 It is a schematic diagram of a laser gas analysis system. A proportional-integral-derivative (PID) temperature control system composed of a semiconductor refrigerator (TEC) 21, a thermistor 22 and a drive circuit 23 accurately controls the temperature of the semiconductor laser 24 to a set value. The current source 25 outputs current (composed of a low-frequency triangular wave current an...

Embodiment 2

[0063] Refer to figure 1 , figure 2 This embodiment relates to a laser gas analysis system for measuring the concentration of hydrogen sulfide gas in nitrogen (range 0-200ppm). The analysis system uses a center wave number of 6290.25 cm -1 The characteristic absorption spectrum line 31 of hydrogen sulfide is used to measure hydrogen sulfide; the temperature range and pressure range of calibration are 273K-313K and 0.8atm-1.2atm respectively. This example specifically introduces the use of low-toxicity, stable performance, and non-toxic The method of calibrating by adsorbing carbon monoxide instead of hydrogen sulfide, which is highly toxic, unstable, and highly adsorbable:

[0064] a. According to the gas spectrum data in the Molecular Spectroscopy Database (HITRAN), near the measurement spectrum line 31 and within the tuning range of the semiconductor laser output frequency, select the characteristic absorption spectrum line 32 of carbon monoxide, with a central wavenumber of 6...

Embodiment 3

[0073] Refer to figure 1 , figure 2 , This embodiment relates to a laser gas analysis system for measuring the concentration of water vapor in the air (range 0-200ppm), the analysis system uses a center wave number of 6963.17cm -1 The characteristic absorption spectrum line 33 of the water vapor is used to measure the water vapor concentration; the temperature range and pressure range during calibration are 273K-313K and 0.8atm-1.2atm, respectively. This example specifically introduces the use of non-toxic, stable performance carbon dioxide instead The method of calibrating water vapor that is easy to adsorb, easy to condense, and difficult to calibrate.

[0074] a. According to the gas spectrum data in the Molecular Spectroscopy Database (HITRAN), in the vicinity of the measurement spectrum line 33 and within the tuning range of the semiconductor laser output frequency, select the absorption spectrum line 34 of carbon dioxide with a central wavenumber of 6963.94 cm -1 ;

[0075]...

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Abstract

The invention discloses a method for labeling a laser gas analyzing system, which adopts modulated absorption spectrum technology and comprises the following steps: a. choosing the spectral line II of the replacing gas in the output frequency range; b. choosing the work parameter when the laser is labeling; c. obtaining the function relation f2 (P, T, ªŽ) of the output signal density and pressure, temperature, absorption spectrum linear function of unit density and unit optical path of the replacing gas; d. obtaining f1(P, T, ªŽ) of the spectral line I of the system and f2(P, T, ªŽ) dispersed value ratio of spectral line II; e. modulating the replacing gas to obtain the label factor K on spectral line I and storing it in the signal analyzing unit.

Description

(1) Technical field [0001] The invention relates to a calibration method of a gas analysis system, in particular to a calibration method of a gas analysis system based on tunable laser absorption spectroscopy technology. (2) Background technology [0002] The tunable laser absorption spectroscopy (TLAS) gas analysis system (hereinafter referred to as the laser gas analysis system) has the advantages of simple system, high reliability, fast measurement response speed, and high analysis accuracy. It has become more and more popular in the fields of modern industry, scientific research and environmental protection. The wider the application. [0003] The measurement accuracy of the laser gas analysis system is achieved by calibrating the system with the calibration gas of the gas being measured (the gas being measured with a known concentration). The aging of the light source and electronic components will cause the slow drift of the analysis system parameters and reduce the accurac...

Claims

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Application Information

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IPC IPC(8): G01N21/39G06F19/00G06F17/15
Inventor 顾海涛王健李鹰
Owner FOCUSED PHOTONICS
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