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Laser spectrum absorption detecting method of optical fiber sensing coalmine gas

A coal mine gas and optical fiber sensing technology, which is applied in the measurement of color/spectral characteristics, etc., can solve the problem that the detection method is susceptible to interference, and achieve the effect of eliminating interference components, the method is simple and feasible, and the data error is reduced.

Inactive Publication Date: 2011-09-21
周孟然
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Problems solved by technology

[0004] The purpose of the present invention is to provide a laser spectrum absorption detection method for optical fiber sensing coal mine gas to solve the problem that the detection method in the prior art is susceptible to interference

Method used

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  • Laser spectrum absorption detecting method of optical fiber sensing coalmine gas
  • Laser spectrum absorption detecting method of optical fiber sensing coalmine gas
  • Laser spectrum absorption detecting method of optical fiber sensing coalmine gas

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Embodiment Construction

[0025] Such as figure 1 shown. The invention adopts a laser controlled by a data processing controller to select two kinds of monochromators with different wavelengths to obtain a double-wavelength broadband light source. The laser is connected to the emitting device through an optical fiber, and the emitting device includes an optical collimation system, and the signal light of the laser is emitted to the mixed gas in the gas chamber through the emitting device. The light receiving device adopts a light detector, which receives the light signal emitted from the gas chamber through the light detector, converts the light signal into an electrical signal and sends it to the data processing module, and then sends it to the computer through the network port after being processed by the data processing module.

[0026] 1. Selection of wavelength

[0027] Although the sensing system based on dual-wavelength absorption spectroscopy technology has many advantages, how to choose the ...

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Abstract

The invention discloses a laser spectrum absorption detecting method of optical fiber sensing coalmine gas. The method comprises the following steps of: firstly, selecting a measured wavelength and a reference wavelength of a double-wavelength bandwidth light source; next, detecting multiple gas chambers by using a wavelength division multiplexing technology according to the selected double-wavelength bandwidth light source so as to obtain the concentration C of a gas component to be detected in the mixed gas, wherein mixed gas is injected in the multiple gas chambers; and finally, establishing a neural network model by using a BP (Back Propagation) algorithm, forecasting the concentration of the gas component to be detected by using the neural network model, and establishing a forecasting model of the concentration of the gas component to be detected.

Description

technical field [0001] The invention relates to the field of gas monitoring methods, in particular to a laser spectrum absorption detection method for optical fiber sensing coal mine gas. Background technique [0002] In my country's coal industry, gas disasters have always been the enemy of coal mine safety production, and have become the main factor restricting coal mine safety production. Nowadays, with the continuous improvement of coal mining technology and mining technology, the continuous expansion of mining scale and the continuous extension of mining depth, the amount of coal seam gas emission is also increasing. more and more. The proportion of gas accidents, especially heavy and extraordinarily large gas accidents, in coal mine accidents is getting higher and higher, and the adverse effects caused are also getting bigger and bigger. Coal mine gas monitoring is the top priority of my country's current coal mine safety production supervision and management. Estab...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
Inventor 周孟然张海庆
Owner 周孟然
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