New nodal real time gas concentration monitoring method and sensor

A gas concentration, real-time monitoring technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of interference, short life, poor stability, etc., to overcome the slow response speed, reduce system costs, and real-time online monitoring.

Inactive Publication Date: 2007-04-11
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] At present, chemical sensors are mainly used for gas monitoring at home and abroad. Due to the use of chemical sensitive components, these sensors are prone to surface pollution, short life, poor stability, and interference from other gases.
In addition, there are zero drift and sensitivity changes when working for a long time, which affects the reliability of the monitoring system

Method used

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  • New nodal real time gas concentration monitoring method and sensor
  • New nodal real time gas concentration monitoring method and sensor

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Embodiment Construction

[0015] See Figure 1 and Figure 2.

[0016] Labels in the figure: 1. Main box, 2. Downhole part, 3. Main power switch, 4. Semiconductor laser temperature and current control module, 5. Signal generation circuit, 6. Near-infrared DFB semiconductor laser, 7. 1×N(N1 ~64 optional, determined by the laser power and the number of points required to be measured) single-mode fiber coupler, 8, output fiber connector, 9, input fiber connector, 10, main power socket, 11, fan, 12, DC stabilizer Piezoelectric source, 13, input 1×N optical switch, 14, input 1×N optical switch drive circuit, 15, self-focusing lens collimator, 16, calibration absorption pool, 17, focusing lens, 18, infrared photodetector, 19. Lock-in amplifier, 20. Data acquisition, processing and control module, 21. Liquid crystal display. The components involved in the above are all installed on the chassis 1 . 22. Output single-mode fiber, 23. Gas absorption cell, 24. Input single-mode fiber, 25. V-groove, 26. Output self...

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Abstract

The new type nodal real-time gas densitymonitoring method and sensor has one near infrared DFB semiconductor laser and operates on the characteristic absorption of methane in the near infrared spectrum region. One monomode fiber power coupler is used in separating the laser beam into several beams led through fibers to fiber gas absorption cells in mine, and the laser beams through the absorbed gas are then led through fiber to the input optical switch. The selected signal through the calibrating cell is projected to the laser detector. By means of wavelength modulating technology and second harmonic detecting technology, the present invention realizes gas density measurement in high sensitivity, high resolution, no gas interference and fast response. Background light strength signal fitting method is adopted to eliminate the influence of light strength fluctuation on the measurement.

Description

technical field [0001] The invention belongs to a gas laser spectrum measuring instrument, in particular to a distributed optical fiber CH based on near-infrared semiconductor laser absorption spectroscopy 4 Gas concentration multi-channel monitoring instrument. Background technique [0002] The coal industry is the industry with the most serious casualties in my country's industrial production. The average annual death rate in coal mine accidents is more than 6,000, and the death rate per million tons of coal has always been above 3.0, which is much higher than other major coal-producing countries in the world. Industry is called "industry for life". From the perspective of accident types, the main causes of serious accidents with more than 30 fatalities are gas explosions and gas outbursts. Gas is a general term for harmful gases attached to coal seams and surrounding rock formations. The main component is methane, which is flammable and explosive. 46% of coal mines in my...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G01N21/27
Inventor 陈玖英刘建国张玉钧阚瑞峰王敏陈东崔益本刘文清
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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