A kind of sapphire temperature sensor and its manufacturing method and temperature measuring system

Abstract

Disclosed are a sapphire temperature sensor, a manufacturing method thereof, and a temperature measurement system. The sapphire temperature sensor includes: a heat protection device, a sapphire fiber probe, and a fiber coupler; one end of the sapphire fiber probe is a sensor head, and the other end is connected to the fiber coupler; the heat protection device is surrounded by the outside of the sapphire fiber; the sensor head is placed At one end of the heat protection device, the other end of the protection device is connected to the fiber coupler; the sensing head is composed of a black body cavity coated on the outer surface of one end of the sapphire optical fiber, and the black body cavity is heated by a variety of temperature-sensitive material particles through a plasma arc to melt state and evenly sprayed on the outer surface of one end of the sapphire fiber. The sapphire fiber optic temperature sensor made by plasma spraying method has the advantages of wide temperature measurement range, fast thermal response, high precision, long life, low cost and intrinsic insulation, and has more prominent advantages than traditional thermometers, such as corrosion resistance, Strong ability to resist electromagnetic interference.

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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