Novel FBG temperature sensor based on low-melting glass, and packaging process of the same

Abstract

The invention discloses a novel FBG (Fibber Bragg Gratting) temperature sensor based on low-melting glass, and a packaging process of the same. The novel FBG temperature sensor based on low-melting glass includes an alumina ceramic tube (1), a polyimides FBG (2), low-melting glass (3), rubber tail sleeves (4) and high temperature protective sleeves (5), wherein the polyimides FBG (2) penetrates through the alumina ceramic tube (1), is arranged at the central position of the alumina ceramic tube (1), and is in parallel with the alumina ceramic tube (1); the low-melting glass (3) is used to enable the alumina ceramic tube (1) and the polyimides FBG (2) to form a ceramic tube-FBG assembly; the rubber tail sleeves (4) respectively sleeve two ends of the ceramic tube in an interference fit mode; the high temperature protective sleeves (5) respectively sleeve respectively two segments of polyimides tail fibre portions outside the ceramic tube-FBG assembly; and interference fit is performed between the high temperature protective sleeves (5) and the rubber tail sleeves (4). The novel FBG temperature sensor based on low-melting glass has the advantages of being simple in the packaging process, being high in repeatability of the sensor after packaging, and being high in reliability, and is significant for solving the FBG sensor packaging process problem.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, in particular to a packaging process method for an FBG temperature sensor. Background technique [0002] In 1978, K.O.Hill et al. discovered the photosensitivity of germanium-doped fiber and demonstrated the feasibility of forming a grating on the fiber core. As a result, a new type of fiber optic passive device FBG, that is, Fiber Bragg Grating (Fibber BraggGratting). With the continuous improvement of FBG writing technology and the increasingly abundant application results, FBG is known as one of the most promising and representative optical fiber passive devices at present. Its application research in multiple sensing fields such as temperature, strain, and pressure has also entered a new stage of development. [0003] Optical fiber sensors are very suitable for applications in the field of health monitoring due to their light weight, small size, anti-electromagnetic interference, and co...

AI Technical Summary

Problems solved by technology

Due to the low temperature sensitivity of the bare gate, which reduces the sensing accuracy, it is necessary to package the FBG

According to whether the gate area is bonded or not, the packaging method is divided into adhesive method and coating method. The sensor packaged by the adhesive method is prone to chirp phenomenon during long-term use; another packaging method is metal coating, which is complicated in process , high cost and difficult to manufacture

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