Mine-used large-range fiber grating passive roof bed separation sensor

Abstract

The invention discloses a mine-used large-range fiber grating passive roof bed separation sensor, which comprises a shell, a wire rope roller mechanism and a fiber grating strain mechanism, and is characterized in that the fiber grating strain mechanism comprises a second gear, a precision screw rod with one end fixed with the second gear and rotating along with the second gear, a bevel slider with a bevel surface, a strain gauge fixing square block, and a fiber grating strain gauge, wherein the bevel slider sleeves the precision screw rod and can axially move along the screw rod; the strain gauge fixing square block is fixed on a front bearing support frame, and the position of the strain gauge fixing square block is corresponding to that of the bevel slider; and one end of the fiber grating strain gauge is fixed by the strain gauge fixing square block and the other end is a free end contacted with the bevel surface of the bevel slider and capable of sliding relatively, and a fiber grating is attached to the fiber grating strain gauge. The circular motion of the roller pulled by the wire rope changes to the axial motion of the bevel slider on the precision rod, the wavelength of the fiber grating changes, and real-time online dynamic roof bed separation monitoring can be realized.

Description

technical field [0001] The invention relates to the technical field of coal mine safety detection, in particular to a mine-used large-range optical fiber grating passive roof separation sensor. Background technique [0002] Optical fiber sensing technology is a new science and technology, and it is also an important technical foundation of the information society, occupying a very important position in contemporary high technology. Optical fiber sensing technology was established rapidly with the emergence of optical fiber communication technology in the 1970s. By using light waves as a carrier and optical fiber as a medium, it is a new sensing technology with perception and signal transmission. The light wave as the carrier of the measured signal and the optical fiber as the light wave propagation medium have a series of unique advantages that are difficult to compare with other carriers and media. [0003] In the process of monitoring the mine pressure, due to various obj...

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Problems solved by technology

[0004] The existing mine pressure detection device is incomplete, poor anti-interference ability, poor data transmission ability, short transmission distance, unable to passive real-time online monitoring, large area detection sensors and on-site power supply of substations are complex, with the deep mining of mines, the requirements The range of the sensor for monitoring roof deformation is large, and the range of existing sensors cannot meet the actual needs of the site, and the sensor data cannot be uploaded locally in real time, which often results in inadequate mine safety monitoring

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