Fibre optic gas detector for fire hazard of coal gab area

A technology for gas detectors and gobs, applied in the direction of color/spectral characteristic measurement, spectrum generation using multiple reflections, spectrum generation, etc.

Inactive Publication Date: 2009-09-30
LASER RES INST OF SHANDONG ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a remote uncharged all-fiber-optic gas sensor fire detector for spontaneous combustion fire gas detection in goafs of coal mines to solve the problems existing in the prior art

Method used

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  • Fibre optic gas detector for fire hazard of coal gab area
  • Fibre optic gas detector for fire hazard of coal gab area
  • Fibre optic gas detector for fire hazard of coal gab area

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Embodiment Construction

[0070] Such as image 3 As shown in , choose a distributed feedback semiconductor laser with temperature control as the light source; the relationship between the driving current signal and time is as follows Figure 4 As shown, it is the superposition effect of the above three signals. Since the center wavelength of the laser emitted by the laser and the magnitude of the driving current are also approximately linear, the change in the wavelength of light emitted by the driving signal driven by the laser is also the superposition effect of the above three signal waveforms. The sawtooth signal is 100Hz, and the sine signal is 10KHz. The central wavelength of the light source is required to select an appropriate central wavelength according to the corresponding absorption peak position of the gas in Table 1. Different gases require lasers with different central wavelengths; for example, to detect carbon monoxide, we choose 1.567um as the central wavelength of the light source, a...

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Abstract

The invention relates to a fibre optic gas detector for the fire hazard of a coal gab area, comprising a light source, a probe, a photodetector and a signal processing unit, wherein light emitted by the light source is led into the photodetector by the probe so as to be converted into electrical signals, and the electrical signals are led into the signal processing unit to be processed. The fibre optic gas detector is characterized in that an optical circulator is arranged on a light path between the light source and the probe, the light source is connected with the first port of the optical circulator, the probe is connected with the second port of the optical circulator, the third port of the optical circulator is connected with a photoelectric converter, the probe is of a multi-time reflection type white cell structure, and a terminal optical fiber collimator and a fibre reflecting mirror are arranged on the exit end of the white cell.

Description

technical field [0001] The invention belongs to the fire detection technology of coal mine goaf, in particular to a fire gas optical fiber detector applied to coal mines. Background technique [0002] In recent years, with the rapid and violent development of my country's economy, more and more environmental and safety production problems have emerged. In recent years, there have been frequent large-scale safety accidents in my country's coal mines that hurt personal safety, gas explosions have continued, and coal mine fires have occurred frequently. To maintain normal production and life, these problems must be effectively resolved. Gas detection is a major means to achieve safe production. In coal mines, the fire prediction of spontaneous combustion in goafs is also based on trace gases such as carbon monoxide, acetylene, ethylene, hydrogen, and sulfide. It can be seen that the development of a sensor that can detect trace gases is very necessary for safe production in c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G01J3/26
Inventor 倪家升刘统玉王昌宋志强赵燕杰王黔
Owner LASER RES INST OF SHANDONG ACAD OF SCI
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