A large-range fiber grating displacement sensor and its measuring method

Abstract

The invention discloses a wide-range fiber bragg grating displacement sensor and a measuring method. The wide-range fiber bragg grating displacement sensor comprises a sensor body and a steel wire rope fixing structure. The sensor body comprises a sensor outer shell, an optical fiber, a strain beam, a first fiber bragg grating, a second fiber bragg grating, a precise screw, a first support, a reel, a steel wire rope, a spring box, a second support and a volute spiral spring, wherein the optical fiber, the strain beam, the first fiber bragg grating, the second fiber bragg grating, the precise screw, the first support, the reel, the steel wire rope, the spring box, the second support and the volute spiral spring are arranged inside the outer shell. The first support and the second support are fixed on the sensor outer shell. The outer side of the first support is fixedly provided with the strain beam. The upper side and the lower side of the strain beam are bonded with the first fiber bragg grating and the second fiber bragg grating respectively. The precise screw doing reciprocating movement through thread transmission is fixed between the first support and the second support. The reel is fixed on the precise screw. The wide-range fiber bragg grating displacement sensor has the advantages that the sensitivity of the sensor can be adjusted by changing the screw pitch P of the precise screw, the range can be adjusted by changing the diameter of the reel, and long-distance measuring can be carried out compared with an ordinary optical fiber sensor.

Description

technical field [0001] The invention relates to a displacement sensor, in particular to a large-range optical fiber grating displacement sensor and a measuring method, which are suitable for real-time on-line monitoring of the displacement of a coal mine hydraulic support. Background technique [0002] The level of comprehensive coal mining mechanization in my country is constantly improving. With the continuous development of comprehensive coal mining mechanization and the use of new high-power coal mining machines and face conveyors, it is required to match the monitoring technology of the working state of hydraulic supports. At present, the monitoring system of coal shearer and transport machine has been put into use in many coal mines, but the real-time monitoring system of the working state of the hydraulic support lags behind the above-mentioned monitoring system, which brings great inconvenience to the field workers. [0003] The current status monitoring of hydraulic...

AI Technical Summary

Problems solved by technology

At present, the monitoring system of coal shearer and transport machine has been put into use in many coal mines, but the real-time monitoring system of the working status of the hydraulic support lags behind the above-mentioned monitoring system, which brings great inconvenience to the field workers

[0003] The current status monitoring of hydraulic supports mostly adopts electronic sensing devices. Due to the strong electromagnetic interference on the working surface, it is easy to cause inaccurate measurement, and the existing linear sensors of hydraulic supports have high installation costs, serious signal drift, and long-distance signal transmission. Difficult, inconvenient for networking, and poor anti-interference ability to the on-site environment, it needs frequent zeroing and calibration, and is easy to be damaged during the working process of the bracket; the existing fiber grating displacement sensor has high precision and anti-electromagnetic interference, but the range Smaller, generally within 200mm, which cannot meet the requirements of on-site use

Various monitoring methods are not systematic

Images