Laser absorption spectrum trace amount gas analysis method and apparatus using the same

A technology of laser absorption spectroscopy and trace gas, which is applied in the field of industrial engineering control and gas parameter analysis, and can solve the problems of complex instrument structure, reduced reliability, increased instrument difficulty and manufacturing cost, etc.

Active Publication Date: 2009-05-27
CHONGQING CHUANYI AUTOMATION +1
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Problems solved by technology

Such high temperature measurement and control requirements greatly increase the difficulty and manufacturing cost of the instrument
[0012] 3. Complex structure
[0013] In order to measure the temperature and pressure of the working gas, redundant temperature and pressure sensors need to be installed in the entire instrument system, and corresponding control and processing systems should also be installed in the circuit; plus the above-mentioned laser temperature measurement and control device, the structure of the entire instrument appears to be Quite complex and reduces reliability

Method used

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  • Laser absorption spectrum trace amount gas analysis method and apparatus using the same
  • Laser absorption spectrum trace amount gas analysis method and apparatus using the same
  • Laser absorption spectrum trace amount gas analysis method and apparatus using the same

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Embodiment Construction

[0058] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0059] See attached Figure 4 The optical path of the online self-calibrating laser absorption spectrum trace gas analysis device includes two parts: a measuring optical path and a calibrating optical path, both of which share a laser diode light source 2 and an optical fiber beam splitter 3. Among them, the independent part of the measurement optical path includes the transmission optical fiber 4, the optical fiber calibrator 6, the optical beam expander 8, the gas container to be measured 11, the optical beam reducer 12, the spatial light-fiber coupler 13, the transmission optical fiber 14, the detection Several parts such as the device 17; the calibration optical path includes several parts such as the transmission optical fiber 5, the optical fiber calibration device 7, the calibration gas chamber 9, and the detector 19. exist Figure 4 A...

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Abstract

The invention relates to an on-line self-calibration laser-adsorption-spectrum trace gas analysis method and the laser-adsorption-spectrum trace gas analysis device employing the method. The method comprises establishing a calibration gas chamber in the measuring light path, adding the standard gas the same as the gas to be measured in the calibration chamber, and calculating the concentration of the gas to be measured by detecting the original light intensity and the line intensity of the measuring light path and the calibration light path irrespective of the gas temperature and the pressure. The method for measuring the concentration of the gas to be measured is simple and accurate, and the device employing the method is also simplified remarkably and can realize real-time self-calibration.

Description

technical field [0001] The invention belongs to the field of industrial engineering control and gas parameter analysis; in particular, it relates to a self-calibrating laser absorption spectrum trace gas parameter analysis method and a device using the method. Background technique [0002] The parameter analysis of exhaust gas is an important part of industrial engineering control; in the fields of waste incineration, combustion control of thermal power generation, petrochemical, metallurgy, cement and other production fields, the parameter measurement of exhaust gas is the key to optimize production and reduce energy consumption technology. Traditional measurement methods need to extract a part of the gas from the working environment, use physics and chemistry to purify, purify, and analyze; the process is complex, the measurement cost is high, and the real-time performance is not good. Semiconductor laser absorption spectroscopy is an emerging gas measurement method, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G06F19/00G02B26/08
Inventor 张军陈俊清朱永
Owner CHONGQING CHUANYI AUTOMATION
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