A mine-used fiber grating temperature sensor

Abstract

A fiber grating temperature sensor for mining, belonging to the field of temperature detection, which includes an outer casing, an inner casing and a sensing optical fiber; two ends of the outer casing are respectively connected with ferrule-type tapered thread straight-through pipe joints for connecting with optical cables ; The inner sleeve is located in the outer sleeve, and the inner sleeve is provided with at least two rubber collars, and the outer edge of the rubber collar is configured with the inner wall of the outer sleeve for radial positioning of the inner sleeve; The sensing optical fiber includes a fiber grating and bare optical fibers at both ends thereof. The optical fiber grating is arranged in the inner sleeve, and the bare optical fiber passes through the inner sleeve and the outer sleeve in sequence for fusion splicing with the transmission optical fiber in the optical cable. Compared with the prior art, the optical fiber grating temperature sensor of the present invention has high tensile strength, is easy to install, and is suitable for integrating multiple points to form a distributed temperature measuring cable, realizing multi-point, multi-field detection, and long-distance transmission, especially It is suitable for the detection of the temperature field in the harsh environment of coal mines.

Description

technical field [0001] The invention belongs to the field of temperature detection, and specifically refers to a mine-used optical fiber grating temperature sensor, which is applicable to the detection of the temperature field in coal mines and the temperature in industrial production. Background technique [0002] Accurate detection of the internal temperature of the goaf in the coal mine is one of the important means to judge the spontaneous combustion of the goaf, especially the distribution and change of the temperature field in the goaf is the direct basis for judging whether spontaneous combustion occurs. Therefore, it is of great significance to take effective measures to grasp the temperature conditions of the coal mine underground and the underground goaf in a timely manner for safe operation and to reduce the management cost of the coal mine after mining. [0003] Fiber Bragg grating sensor is a new type of optical sensor, which has the advantages of small size, in...

AI Technical Summary

Problems solved by technology

[0004] At present, the connection between the fiber optic grating temperature sensor and the optical cable is over-connected by the sleeve-type metal joint, which is mainly fixed by the extrusion friction between the two. The problem of long-distance detection cannot be applied to the special harsh environment of coal mines

Images