Online calibration method of in-situ type laser gas analyzer

A technology of laser gas and calibration method, applied in the direction of color/spectral characteristic measurement, etc., can solve the tediousness, increase the operation and maintenance cost of the in-situ laser gas analyzer, and the calibration, calibration and verification method of the in-situ laser gas analyzer Complex problems, to achieve the effect of reducing operation and maintenance costs and simplifying the calibration process

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,

Method used

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  • Online calibration method of in-situ type laser gas analyzer
  • Online calibration method of in-situ type laser gas analyzer
  • Online calibration method of in-situ type 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, laser spectroscopic module 102, laser control module 103, signal processing detection unit 104, calibration gas chamber 105, calibration signal detection unit 106, signal switching module 107, signal processing module 108, data analysis module 109, display unit 110 And measuring pipeline 111.

[0048] The laser control module 103 is connected to the laser emitting unit 101 for driving the laser emitting unit 101 to emit laser light with a specific wavelength.

[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.

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Abstract

The invention discloses an online calibration method of an in-situ type laser gas analyzer. A laser emitting unit, a laser splitting module, a signal detecting unit, a calibrating signal detecting unit, a signal switching module, a laser device controlling module, a signal processing module, a data analyzing module, a calibrating air chamber and a measuring pipe are provided. The online calibration method comprises the following steps that: during regular measurement, the signal detecting unit is connected with the signal processing module through the signal switching module so that the regular measurement is carried out on the in-situ type analyzer; and when calibration needs to be carried out, standard gas with known consistency is charged into the calibration air chamber firstly, the calibrating signal detecting unit is connected with the signal processing module through the signal switching module, and the signal processing module records a gas absorption spectrum obtained by the calibrating signal detecting unit and can be used for comparing a measurement value with a calibrating air consistency value, and thus the online calibration of the in-situ type laser gas analyzer is realized.

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 周欣韩敏艳
Owner BEIJING DEFINE TECH
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