Sapphire fiber F-P high temperature sensor provided with inclination reflection surface as well as preparation method and temperature sensing system thereof

Abstract

The invention provides a sapphire fiber Fabry-Perot (F-P) high temperature sensor provided with an inclination reflection surface as well as a preparation method and a temperature sensing system thereof, solving the problems that interference spectral quality of an existing sapphire fiber F-P high temperature sensor can be easily polluted by high temperature glue and dust and the interference spectral quality is influenced by other reflection surfaces except an F-P reflection surface, and having important research significance in high temperature detection fields such as aeroengine turbine blades, high temperature tail gas and metallurgical industry. The high temperature sensor provided by the invention comprises a sapphire fiber 1, a sapphire fiber 5 provided with the inclination reflection surface at the tail end and a ceramic ferrule 3; the sapphire fiber 1 and the sapphire fiber 5 provided with the inclination reflection surface are inserted into the ceramic ferrule 3, an air-filled cavity which can produce F-P interference is reserved between the end surfaces of the sapphire fibers 1 and 5 which are inserted into the ceramic ferrule 3, and high temperature cermica glue 2 is utilized for fixing respectively among the ceramic ferrule 3, the sapphire fiber 1 and the sapphire fiber 5 provided with the inclination reflection surface.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensors, in particular to a sapphire optical fiber F-P high-temperature sensor with an inclined reflective surface, a preparation method and a temperature sensing system, which have important applications in the fields of high-temperature detection of aeroengine turbine blades, high-temperature exhaust gas, and metallurgical industries. Significance. Background technique [0002] Modern industrial production has more and more demands for high-temperature measurement in harsh environments, and higher requirements are placed on the range and accuracy of temperature measurement. Sapphire optical fiber has the advantages of high melting point (2040°C), small size, high hardness, corrosion resistance and electromagnetic interference resistance, and is especially suitable for high temperature sensing requirements in harsh environments. The high-temperature sensing technology based on sapphire fib...

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Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the present invention proposes a sapphire optical fiber F-P high temperature sensor with an inclined reflective surface and its preparation method and temperature sensing system. The air cavity between two sapphire optical fiber end faces is used as the F-P cavity, and the reflective The end of a sapphire fiber at the end has an inclination angle, which effectively solves the influence of the end reflection surface on the quality of the F-P interference spectrum, and uses ceramic ferrules to package the two sapphire fibers, which effectively solves the problem that the sapphire fiber end is easily polluted , to improve the structural stability of the sensor

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