Full-mechanized hydraulic support fiber bragg grating pressure sensor

Abstract

The invention discloses a full-mechanized hydraulic support fiber bragg grating pressure sensor, wherein the sensor adopts a cylindrical shell, and a pressure oil cavity, a sealing member and a sensing piston are arranged in the shell, the oil pressure change of the pressure oil cavity is transferred to the sensing piston, a belleville spring deforms under the action of oil pressure, sensing fiber bragg grating is attached onto a transmission device, the transmission device deforms when force is applied thereon so as to cause the wave length of the fiber bragg grating to change, and the fiberbragg grating adopts encapsulation with the temperature compensation function. The effects and the benefits of the invention are that the fiber bragg grating pressure sensor has high sensitivity, large measurement range, simple structure and long-term reliability, can real-timely monitor the measurement, and is beneficial to promote the application of the fiber bragg grating pressure sensor in mine mentoring.

Description

technical field [0001] The invention relates to an optical fiber grating sensor for measuring pressure, in particular to a fully mechanized mining hydraulic support optical fiber grating pressure sensor for measuring mine roof pressure. Background technique [0002] At present, pressure sensors used in mines can be divided into mechanical type, hydraulic type, resistance strain type, vibrating wire type, etc. according to their working principles. [0003] Mechanical and hydraulic pressure sensors are simple in structure, reliable in operation, and low in cost, but have disadvantages such as slow response speed, low precision, and large volume; resistance strain sensors are based on the fact that when the metal wire is mechanically deformed under the action of an external force, its It is made by the resistance strain effect that the resistance value changes. It is more sensitive and accurate than mechanical and hydraulic sensors, but this type of sensor has disadvantages su...

AI Technical Summary

Problems solved by technology

[0003] Mechanical and hydraulic pressure sensors are simple in structure, reliable in operation, and low in cost, but have disadvantages such as slow response speed, low precision, and large volume; resistance strain sensors are based on the fact that when the metal wire is mechanically deformed under the action of an external force, its It is made by the resistance strain effect that the resistance value changes. It is more sensitive and accurate than mechanical and hydraulic sensors, but this type of sensor has disadvantages such as sensitivity to temperature and poor long-term stability.

[0004] The vibrating wire sensor was successfully developed and applied in the early 1980s. It uses the principle of steel strings with different fixed frequencies under different tensions to realize force detection. It is currently the most commonly used instrument in mine pressure detection. However, this type of sensor still has defects such as low precision and slow response speed.

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