High temperature resistant optical fiber temperature sensor

Abstract

The invention provides a high temperature resistant optical fiber temperature sensor. The high temperature resistant optical fiber temperature sensor comprises a light source, a light splitter, a reference light path, a sensitive light path, a light power meter and a data processing and storage device, wherein the reference light path and the sensitive light path are connected in parallel, one endof the reference light and one end of the sensitive light path are connected with the light splitter and the light source in sequence, and the other end of the reference light path and the other endof the sensitive light path are connected with the light power meter and the data processing and storage device in sequence; and the reference light path and the sensitive light path are sensitive optical fibers respectively. According to the optical fiber temperature sensor, a multi-doped sapphire crystal material is taken as the sensitive optical fibers, the optical fiber temperature sensor comprises an optical fiber core and a cladding material coated outside the optical fiber core, the preparation technology of the optical fiber core is simple, the optical fiber temperature sensor has excellent absorption characteristic and up-conversion strength, and the application range of the sapphire optical fiber is greatly improved; the cladding material uses doped poly-crystal aluminum oxide and Er3+ multi-component phosphate glass, the cost is low, and the requirement of total reflection can be met; and 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 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 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 optical fiber temperature sensors mainly include fiber Bragg grating (FBG) temperature sensor, semiconductor absorption high temperature resistant optical fiber temperature sensor and optical 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 optical fiber temperature sensor has high requirements on the signal transmission optical fiber, and usually requires a special large-aperture optical fiber; and because the optical fiber and the semiconductor thin film are indirectly coupled, the optical coupling efficiency is much lower than the direct fusion coupling between the optical fiber and the optical fiber; semiconductor diaphragm production The process 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 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

Images