Optical fiber grating temperature sensor and preparation method

Abstract

The invention discloses an optical fiber grating temperature sensor. The sensor comprises an optical fiber, a quartz tube and a ceramic cap. A regeneration optical fiber grating is prepared by conducting high-temperate annealing of 1,000 DEG C on a common optical fiber grating, before annealing, the optical fiber grating is subjected to high-temperate tubular encapsulation at first, an inner layerof an encapsulation structure is the quartz tube, an outer layer is the ceramic cap, the optical fiber grating is arranged at the top of the encapsulation structure, and the other end is bonded and fixed by adopting high-temperate glue. According to the high-temperature optical fiber grating temperature sensor with high reliability and stability, application of the optical fiber grating temperature sensor in the high-temperature environment of 1,000 DEG C is successfully achieved, and the sensor has high measurement precision and high-temperature stability and is suitable for temperature measurement in the high-temperature fields such as aeronautics and astronautics, petroleum electric power and chemical industry smelting.

Description

technical field [0001] The invention relates to an optical fiber grating temperature sensor and a preparation method, belonging to the field of temperature sensors. Background technique [0002] Temperature is closely related to human production and life, and temperature detection is crucial. Traditional electrical sensors are susceptible to electromagnetic interference, and it is difficult to be intelligent and not easy to network. Optical fiber temperature sensors can effectively solve these problems, so they have developed rapidly in recent years. Fiber Bragg grating sensor is a fiber optic sensor based on wavelength demodulation. It has the characteristics of light weight, small size, anti-electromagnetic interference, corrosion resistance, and intrinsic safety. It is suitable for use in flammable, explosive, and corrosive extreme environments. Currently, It has been widely used in the sensing and monitoring of temperature or strain in the fields of power monitoring, st...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide a fiber grating temperature sensor and its preparation method; to solve the problem that ordinary fiber grating sensors are difficult to apply to high-temperature environments, and that the optical fiber is fragile and easy to break after high-temperature annealing problem, give a reliable high-temperature packaging method

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