High-temperature-resistant cladding optical fiber temperature sensor

Abstract

The invention provides a high-temperature-resistant cladding optical fiber temperature sensor. The high-temperature-resistant cladding optical fiber temperature sensor comprises a light source, a light splitter, a reference light path, a sensitive light path, an optical power meter and a data processing and storage device, wherein the reference light path and the sensitive light path are connectedin parallel; one ends of the reference light path and the sensitive light path are connected with the light splitter and the light source in sequence, and the other ends of the reference light path and the sensitive light path are connected with the optical power meter and the data processing and storage device in sequence; and each of the reference light path and the sensitive light path is a sensitive optical fiber. The high-temperature-resistant cladding fiber temperature sensor adopts a sapphire crystal material as a sensitive optical fiber, and comprises an optical fiber core and a cladding material coated outside the optical fiber core; the optical fiber core is simple in preparation process and has excellent absorption characteristics and up-conversion strength, so that the application range of the sapphire optical fiber is greatly expanded; the cladding material is made of multi-component phosphate glass doped with polycrystalline aluminum oxide and Er3+, so that 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 clad optical fiber temperature sensor. Background technique [0002] Since the advent of optical fibers in the 1970s, with the development of science and technology, many high temperature resistant cladding 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, temperature sensors of high temperature resistant cladding fiber mainly include fiber Bragg grating (FBG) temperature sensor, semiconductor absorption type high temperature resistant clad fiber temperature sensor and fiber Fabry-Polrot cavity interferometric temperature sensor. [0003] Among them, the fiber Bragg grating temperature sensor is engraved in the fiber through a precise process, so that the refractive index in the fiber i...

AI Technical Summary

Problems solved by technology

However, the semiconductor absorption type high temperature resistant cladding 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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