Embedded low temperature optical fiber temperature sensor and preparation method thereof

Abstract

The invention discloses an embedded low temperature optical fiber temperature sensor and preparation method thereof. The sensor includes an optical fiber and a capillary glass tube, a coating layer of a tail end optical fiber the optical fiber is stripped and an end face is cut flat, a V-shaped sharp groove of a tiny size is arranged along a direction vertical to a radial direction of the optical fiber at the tail end of the optical fiber where the coating layer is stripped, and a symmetry plane of the V-shaped sharp groove is vertical to the radial direction of the optical fiber; the tail end of the optical fiber where the V-shaped sharp groove is arranged is embedded in the capillary glass tube and the V-shaped sharp groove is located in the capillary glass tube; and two end faces of the capillary glass tube are sealed with low temperature adhesives. The sensor is easy to manufacture, small in size and resistant to electromagnetic interference, can realize measurement of a single temperature variable in low temperature environment, solves the problem in the prior art that a fiber grating has cross sensitivity to temperature and strain, and is suitable for temperature measurement in severe environment of ultralow temperature, large current, high-intensity magnetic field, intense radiation and the like in majority of low temperature engineering.

Description

technical field [0001] The invention belongs to the technical field of optical fiber and cable, and more specifically relates to an embedded low-temperature optical fiber temperature sensor and a preparation method thereof. Background technique [0002] With the continuous expansion of the application of low temperature in the fields of strong magnetic field, energy, nuclear fusion, military industry, space technology and life science, the health monitoring of structures in large-scale low temperature engineering has attracted more and more attention. For example, a superconducting magnetic energy storage device is mainly composed of a superconducting magnet, a cryogenic container, a cryogenic device, a glue device and a monitoring system. The thermal stability of the superconducting magnet and the low temperature technology are the key factors affecting the superconducting magnetic energy storage. Only When the low temperature operation parameters of superconducting magnets...

AI Technical Summary

Problems solved by technology

Fiber Bragg gratings are sensitive to strain-temperature crossover during application, but the research on the basic coefficients in extreme high and low temperature environments is extremely lacking, which limits the related applications of fiber Bragg gratings to a certain extent.

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