Online calibration method of laser online detection system for direction of gas contents in smoke

A detection system, gas content technology, applied in the direction of measuring devices, color/spectral characteristic measurement, material analysis through optical means, etc., can solve the problem of inconvenient calibration of optical gas sensors, and achieve fast calibration speed and high calibration accuracy Effect

Active Publication Date: 2012-02-15
XIAN YIDA INFORMATION SYST
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Problems solved by technology

[0005] In order to solve the technical problem of inconvenient calibration of existing optical gas sensors, the present invention provides an online calibration method for a laser online detection system for flue gas content

Method used

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  • Online calibration method of laser online detection system for direction of gas contents in smoke
  • Online calibration method of laser online detection system for direction of gas contents in smoke
  • Online calibration method of laser online detection system for direction of gas contents in smoke

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Embodiment Construction

[0034] see figure 1 and figure 2 , The flue gas content laser online detection system adopts through-beam optical measurement, mainly including optical drive unit, optical emission unit, optical signal detection unit, electrical signal transmission unit, instrument air distribution unit, central control cabinet, industrial computer, etc.

[0035] The optical drive unit is used to generate modulated laser light, including a function generator and a dual-frequency modulation signal synthesis circuit, a semiconductor laser, a semiconductor laser drive circuit, and a semiconductor laser temperature control circuit; after the system is powered on, the function generator generates two signals of different frequencies , These two signals are respectively sent to the semiconductor laser drive circuit and the subsequent circuit for signal processing, demodulation, and sampling. After the semiconductor laser drive circuit synthesizes the signals of two frequencies, it performs dual-fr...

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Abstract

The invention relates to an online calibration method of a laser online detection system for the detection of gas contents in a smoke. The method comprises the following steps: 1, a beam of modulation laser, which is generated and penetrates a background gas, is divided into two beams: one beam is directly sent to a reference terminus light detector, and the other beam which traverses a smoke pipeline and a calibration tube in order is sent to a measure terminus photodetector; and 2, different concentrations of a gas to be detected are respectively accessed into the calibration tube to respectively measure the output electric signal of the measure terminus photodetector, a calibration coefficient k and a calibration constant B are obtained through calculating, and a calibration formula isobtained. According to the invention, the system which adopts a sensing structure of the two beams and allows the ratio of the detection signal to the reference signal to be only related with the concentration of the gas has the advantages of no need of dismounting, realization of the measure and the calibration with a same apparatus and a same light path, direct online calibration, fast calibration speed, and high calibration precision.

Description

technical field [0001] The invention relates to a calibration method for an optical gas sensor, in particular to an online calibration method for an optical gas sensor. Background technique [0002] In the production process of the refinery, the control of the content of oxygen, carbon monoxide and carbon dioxide in the flue gas is not only related to the quality and output of the refinery, but also involves the power consumption of the main fan. At present, the detection of oxygen, carbon monoxide and carbon dioxide content in the flue gas mainly adopts the optical gas sensor system installed at the inlet and outlet of the three-stage cyclone separator. [0003] Optical gas sensors are mainly gas sensors based on the principle of spectral absorption, mainly infrared absorption gas analyzers. Since the infrared absorption peaks of different gases are different, the gas is detected by measuring and analyzing the infrared absorption peaks. The main advantages of optical gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/35G01N21/3504
Inventor 黄元忠史朝阳
Owner XIAN YIDA INFORMATION SYST
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