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Online calibrating method of in-situ laser gas analyzer

A laser gas and calibration method technology, which is applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of tediousness, increased operation and maintenance costs of in-situ laser gas analyzers, and inability to realize online calibration of in-situ laser gas analyzers, etc. , to achieve the effect of simplifying the calibration process and reducing operation and maintenance costs

Inactive Publication Date: 2012-10-17
BEIJING DEFINE TECH
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Problems solved by technology

[0004] Through research on the prior art, the inventor found that compared with the sampling laser gas analyzer, the calibration, calibration and verification methods of the in-situ laser gas analyzer are more complicated
The existing technology cannot realize the online calibration of the in-situ laser gas analyzer. During the calibration, the in-situ laser gas analyzer needs to be removed from the measuring pipeline, and then installed on a specific gas chamber for calibration. After the calibration is completed, the Install the analyzer back on the pipe
This process is too cumbersome and greatly increases the operation and maintenance costs of the in-situ laser gas analyzer

Method used

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  • Online calibrating method of in-situ laser gas analyzer
  • Online calibrating method of in-situ laser gas analyzer
  • Online calibrating method of in-situ laser gas analyzer

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Embodiment

[0046] figure 1 A schematic diagram of the structure of the in-situ laser gas analyzer online calibration device provided by the embodiment of the present invention, the device includes:

[0047]Laser emission unit 101 , signal detection unit 102 , laser control module 103 , signal processing module 104 , data analysis module 105 , measurement pipeline 106 , online calibration gas chamber 107 and display unit 108 .

[0048] The laser control module 103 is connected to the laser emitting unit 101 for driving the laser emitting unit 101 to emit a laser with a specific wavelength to the gas to be measured in the measuring pipeline 106 .

[0049] The laser emitting unit 101 may be a tunable diode laser, specifically: a semiconductor distributed feedback laser or a semiconductor vertical cavity surface emitting laser.

[0050] The laser control module 103 can drive the laser to modulate and emit laser light with a specific wavelength, frequency and waveform by changing the operati...

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Abstract

The invention discloses an online calibrating method of an in-situ laser gas analyzer. A device comprises a laser emission unit, a signal detection unit, a laser device control module, a signal processing module, a data analysis module, a measurement pipeline and an online calibrating gas chamber. The calibrating method comprises the following steps : selectively carrying out online calibration when the concentration of gas in the measurement pipe is stable, firstly leading nitrogen into the online calibrating gas chamber; recording a gas absorption spectrum obtained by the signal detection unit at the moment by the signal processing module, then leading standard gas at special concentration into the online calibrating gas chamber, recording by the signal processing module the gas absorption spectrum obtained by the signal detection unit at the moment when the standard gas is led; subtracting by the signal processing module the gas absorption spectrum obtained at the moment when the nitrogen is led from the gas absorption spectrum obtained at the moment when the standard gas is led, and obtaining the absorption spectrum of the standard gas, so as to achieve the purpose of online calibration of the in-situ laser gas analyzer.

Description

Technical field: [0001] The invention relates to the field of on-line gas monitoring, in particular to an on-line calibration device and a calibration method for an in-situ laser gas analyzer. Background technique: [0002] Tunable semiconductor laser absorption spectroscopy (TDLAS) is one of the most advanced gas measurement technologies at present. It has developed rapidly in recent years and has begun to be applied in many fields such as aerospace, petroleum, chemical industry, natural gas, metallurgy, and environmental protection. Considered a revolutionary new measurement method. [0003] Laser gas analyzers based on TDLAS technology are mainly divided into two categories: in-situ laser gas analyzers and sampling laser gas analyzers. The in-situ laser gas analyzer is directly installed on the measurement pipeline. Its advantage is that the measurement response time is short, and it does not require time for sampling and pretreatment of the gas to be measured, nor does ...

Claims

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Application Information

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IPC IPC(8): G01N21/39
Inventor 周欣张斌
Owner BEIJING DEFINE TECH
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