High temperature resistant doped fiber temperature sensor

Abstract

The invention provides a high temperature resistant doped fiber temperature sensor, which comprises an optical source, an optical splitter, a reference optical path, a sensitive optical path, an optical power meter, and a data processing and storing device. The reference optical path and the sensitive optical path are connected in parallel, one end thereof is connected with the optical splitter and the optical source in sequence, and the other end thereof is connected with the optical power meter and the data processing and storing device in sequence. The reference optical path and the sensitive optical path are both sensitive fibers. The high temperature resistant doped fiber temperature sensor adopts a doped sapphire crystal material as a sensitive fiber. The material comprises a fiber core and a cladding material coated outside the fiber core. The preparation process of the fiber core is simple, and has excellent absorption characteristics and up-conversion intensity, thereby greatly improving the application range of the sapphire fiber. The cladding material uses multi-component phosphate glass doped with polycrystalline alumina and Er3+, is low in cost, and can meet requirements of total reflection. The sensor is high in detection sensitivity and accurate in 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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