Sapphire temperature sensor and manufacturing method thereof and temperature measuring system

Abstract

The invention discloses sapphire temperature sensor and a manufacturing method thereof and a temperature measuring system. The sapphire temperature sensor comprises a heat protection device, a sapphire fiber-optics probe and an optical fiber coupler. One end of the sapphire fiber-optics probe is a sensing head, and the other end of the sapphire fiber-optics probe is connected with the optical fiber coupler. The heat protection device surrounds the outside of a sapphire optical fiber. The sensing head is arranged at one end of the heat protection device, and the other end of the heat protectiondevice is connected with the optical fiber coupler. The sensing head is formed by wrapping the outer surface of one end of the sapphire optical fiber by a blackbody cavity, and the blackbody cavity is formed by heating multiple kinds of temperature sensing material particles to a molten state through plasma electric arcs and evenly spraying the temperature sensing material particles to the outersurface of one end of the sapphire optical fiber. The sapphire optical fiber temperature sensor manufactured through a plasma spraying method has the advantages of being wide in temperature measuringrange, high in heat response speed, high in precision, long in service life, low in cost and essentially insulated, the advantages are more prominent than those of a traditional thermometer, and the corrosion resistance and the electromagnetic interference resisting capacity are high.

Description

technical field [0001] The invention relates to the field of transient high-temperature measurement, and more specifically, to a sapphire temperature sensor, a manufacturing method thereof, and a temperature measurement system. Background technique [0002] The precise measurement of temperature and heat flow has always been one of the key issues in the development of the combustion field. It is of great significance and application value for the development and design of aero turbine engines, scramjet engines, and high-temperature wind tunnel tests. The common characteristics of state high temperature measurement work are high temperature, rapid change, may be accompanied by high pressure or high speed flow, mostly one-time process, harsh measurement conditions, and traditional thermocouples cannot meet the test requirements. [0003] According to the classification of measurement principles, combustion temperature measurement methods can be divided into contact temperature...

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Problems solved by technology

[0006] The purpose of the present invention is to propose a sapphire temperature sensor and its manufacturing method and temperature measurement system to solve the deficiencies of the existing transient high-temperature field test technology, and to realize high-temperature transient measurement in complex environments such as aerospace engine high-temperature gas

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