High temperature-resistant doped fiber temperature sensor

Abstract

A high temperature-resistant doped fiber temperature sensor provided by the invention includes a light source, a light path splitter, a reference light path, a sensitive light path, a light power meter, and a data processing and storage device. The reference light path and the sensitive light path are connected in parallel. One end of the reference light path is connected with the light path splitter and the light source in turn and the other end of the reference light path is connected with the light power meter and the data processing and storage device in turn. The reference light path andthe sensitive light path are sensitive optical fibers. The high temperature-resistant doped fiber temperature sensor applies a doped sapphire crystal material as a sensitive optical fiber which includes an optical fiber core and a cladding material which covers the optical fiber core. The optical fiber core is prepared by a simple process, and has an excellent absorption behavior and high up-conversion strength, thus the application range of a sapphire fiber is greatly improved; the cladding material applies multi-component phosphate glass in which polycrystal alumina and Er<3+> are doped, thus the cladding material is low in cost and is able to meet the requirement of total reflection. The sensor has high detection sensitivity and can achieve an accurate result.

Description

technical field [0001] The invention relates to the field of temperature detection equipment, in particular to a high temperature resistant doped optical fiber temperature sensor. Background technique [0002] Since the advent of optical fiber in the 1970s, with the development of science and technology, many high temperature resistant doped optical fiber temperature sensors have emerged. Optical fiber has the advantages of small size, light weight, flexible structure, anti-electromagnetic interference, and electrical insulation. At present, high temperature resistant doped fiber temperature sensors mainly include fiber Bragg grating (FBG) temperature sensor, semiconductor absorption high temperature resistant doped fiber temperature sensor and fiber Fabry-Perot cavity interferometric temperature sensor, etc. [0003] Among them, the fiber Bragg grating temperature sensor is engraved in the optical fiber through a precise process, so that the refractive index in the optical...

AI Technical Summary

Problems solved by technology

However, the semiconductor absorption type high temperature resistant doped fiber temperature sensor has high requirements on the signal transmission fiber, and usually requires a special large-aperture fiber; and because the fiber and the semiconductor film are indirectly coupled, the optical coupling efficiency is much lower than the direct fusion coupling of the fiber and the fiber; the semiconductor film The production process of the film is also more complicated, and the process requirements are higher; since the semiconductor absorption is the electronic transition absorption between the conduction band and the valence band, the absorption band is in the short-wavelength band of the ultraviolet and visible light bands.

Therefore, ultraviolet broadband light sources are required, which are expensive, have high requirements for optical fibers, and have low measurement accuracy, usually only ±1°C

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