A Fiber Bragg Grating Displacement Sensor Capable of Multipoint Measurement

Abstract

The invention discloses a fiber bragg grating displacement sensor capable of conducting multi-point measurement. The fiber bragg grating displacement sensor comprises a sensor outer shell and an anchor jaw structure. Two symmetrically-arranged supports are arranged in the sensor outer shell, the outer sides of the supports are respectively provided with a pressing guide column, the inner sides of the supports are provided with pressing springs respectively, the supports are further provided with precision guide rails and precision sliding rails, the precision guide rails are in clearance fit with the precision sliding rails, a spring pulling rod is further arranged below the supports, and extension springs are fixed on the upper portions of the precision guide rails and the upper portion of the spring pulling rod and used for tensioning the precision sliding rails to enable the precision sliding rails to perform reciprocated sliding in the precision guide rails. According to the actual use requirement, the flexibility and the measuring range of the sensor can be selected, the slope heights of the precision guide rails can be changed to adjust the flexibility of the sensor, and the slope lengths of the precision guide rails can be changed to adjust the measuring range.

Description

technical field [0001] The invention relates to a sensor, in particular to an optical fiber displacement sensor suitable for coal mine safety monitoring, that is, roof dynamic monitoring, which can measure multiple point displacements. Background technique [0002] The roof detachment instrument is a special monitoring instrument for monitoring the movement of the roof stratum. Through the comprehensive observation of the roof detachment of various anchor net roadways, it is generally recognized that the roof detachment observation plays a certain role in the support and reform of the anchor net roadway. guidance and warning. According to the data analysis observed by the roof abscission instrument, different geological conditions, lithological changes, etc. were obtained, and the amount of abscission within the range of the anchor net roadway anchor net was summarized, and effective support measures were taken in time to prevent the roof from collapsing Accidents occur to ...

AI Technical Summary

Problems solved by technology

[0004] The purely mechanical layer separation instrument has the disadvantages of intermittent manual observation, time-consuming and labor-intensive, inconvenient downhole observation, large errors, inability to realize real-time on-line monitoring, and slow response speed after the roof is pressed and deformed; while the current Most of the sensors need power supply, the live detection technology is backward, the reliability of the sensors is poor, the maintenance workload is heavy, the monitoring system is seriously disturbed by the electromagnetic field in the signal collection and transmission lines, and it is difficult to deploy in dangerous sources or closed areas such as coal mine goafs , with the danger

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