Temperature-measuring system of distributed fibers

Abstract

The invention relates to a temperature-measuring system of distributed fibers, aiming at the continuous monitoring of temperature parameters of underground electromechanical transport equipment. The temperature-measuring system of distributed fibers comprises a singlechip control board, a fiber temperature field information acquisition module, a photoelectric detector and a circuit signal post-processing module, wherein the fiber temperature field information acquisition module comprises a pulse fiber laser and a wavelength division multiplexer; the circuit signal post-processing module comprises an acquisition card and a personal computer (PC); the singlechip control board is connected with the pulse fiber laser and the acquisition card by leads; the wavelength division multiplexer is connected with the pulse fiber laser and the photoelectric detector by fibers; incident light emitted by the pulse fiber laser is output to the sensing fiber by the wavelength division multiplexer; the sensing fiber feeds backward scattered light with temperature variance information of mine equipment back to the wavelength division multiplexer; and the wavelength division multiplexer extracts two scattered light beams of anti-Stokes and Stokes from the backward scattered light to restrain Rayleigh scattered light and other non-linear scattered light; and the photoelectric detector is connected with the acquisition card by a lead.

Description

technical field [0001] The invention relates to a distributed optical fiber temperature measurement system used for early warning of coal mine fire. Background technique [0002] Coal fires seriously disrupt the normal production order of mines. With the continuous improvement of the degree of mechanization of coal mine production in our country, coal mine electromechanical transportation equipment runs through all production links of the mine, with a long battle line and a wide range of coverage. For example, the power supply cable of a large mine is several kilometers long, the number and length of belt conveyors have increased significantly, and there are hundreds of sets of electromechanical transportation equipment. The risk of fire has also increased greatly, and the degree of disaster has also become increasingly serious. There are tens of thousands of temperature parameter points that need to be continuously monitored. The point-by-point monitoring of traditional d...

AI Technical Summary

Problems solved by technology

The use of traditional distributed sensors for point-by-point monitoring is not only difficult to install, but the entire system has a large structure and is inconvenient to use. Strong electromagnetic interference from power facilities will also affect the reliability of measurement.

Due to the constraints of the existing temperature monitoring technology, it is difficult to achieve comprehensive monitoring, and it is impossible to prevent the occurrence of accidents

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