Low-temperature non-glue packaging process for FBG (fiber brag grating) high-temperature sensor

Abstract

The invention discloses a low-temperature non-glue packaging process for an FBG (fiber brag grating) high-temperature sensor. According to the process, a heat resisting fiber brag grating is sealed with a semi-cylindrical stainless steel pipe by a glass solder with a low melting point, the solder is heated by an electric soldering iron until fused, then, the solder is sealed with the fiber brag grating and the semi-cylindrical stainless steel pipe, due to the heat resisting characteristic of the heat resisting fiber brag grating with a polyimide coating, the fiber brag grating is protected and prevented from being broken off when being sealed, besides the characteristic of a traditional fiber brag grating temperature sensor, a novel packaging technology of the fiber brag grating sensor is provided, the non-glue packaging is hardly affected by stress or strain, the grating part is completely sealed and cannot be affected by ambient humidity, there is no need to worry about the aging problem or to carry out the metallization treatment, no laser welding is required, the cost is low, the operating temperature is low, the stability is high, and the structural process and the treatment process are simple.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a low-temperature gel-free packaging process for an FBG high-temperature sensor suitable for temperature measurement in an environment below 300°C. Background technique [0002] In 1978, K.O.Hill and others of the Canadian Communications Research Center discovered the photosensitive properties of germanium-doped optical fibers and produced the world's first fiber grating. With the advancement of grating writing technology and the discovery of low-temperature and high-pressure hydrogen-loaded sensitization treatment technology , making the mass production of fiber gratings possible, fiber gratings began to be practical, and are widely used in the fields of optical fiber communication and optical fiber sensing. At present, fiber gratings have been widely used in the static and dynamic measurement of many physical parameters such as strain, temperature, and...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a low-temperature gel-free packaging process for FBG high-temperature sensors, which has the characteristics of no need for glue packaging, no need for metallization coating treatment, and can be packaged at low temperature. The process is simple and the reliability is high. Problems existing in FBG high temperature sensor packaging process in existing technology

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