Research On Optical Fiber Interference Type High Temperature Gas Pressure Sensing Technology

Real-time monitoring of high temperature and gas pressure in key parts of aircraft engine is an important technical means to study the working state of aircraft engine,which can provide safe and reliable technical support for aircraft engine.Compared with traditional electrical sensors,optical fiber high-temperature gas pressure sensors have the advantages of small size,high sensitivity,anti-electromagnetic interference,corrosion resistance,and low costsmall size,etc,and have great potential in aircraft engine health monitoring.This paper mainly takes the health monitoring of the key parts of the aircraft engine as the research object,and aims to realize simultaneous measurement of the temperature and gas pressure at the same time.And through the actually test,combined with the theory,the working mechanism of the optical fiber interferometric interference type high temperature gas pressure sensor is expounded.The specific research contents of this paper are as follows:The historical background of the current optical fiber high temperature pressure sensor and the current research statusenvironment are introduced in detail.Different kinds of optical fiber pressure sensors are analyzed and introduced,and the related contents such as the optical fiber high temperature gas pressure sensor based on interference type and the air pressure sensor based on anti-resonance optical waveguide mechanism are systematically introduced.The fabrication method of optical fiber interferometric microcavity sensor is discussed.A compact and simple dual F-P(Fabry-Perot,F-P)interferometric fiber optic sensor based on the suspended core structure is designed and experimentally verified,and it is applied to the simultaneous measurement of temperature and gas pressure in a high temperature environment for the first time.Using mathematical expression derivation,the experimental results are analyzed concretely.The designed sensor has the characteristics of simple production,good repeatability,goodand stability,and low cross-sensitivity within a certain range.At the same time,the sensor is basically packaged with corundum tube,which realizes the exploration of optical fiber temperature and pressure measurement sensors in practical engineering applications.On the basis of the dual F-P fiber optic sensor,two kinds of fiber optic sensors based on anti-resonance mechanism are designed and fabricated by using different types of optical fiber materials.A single FP interference cavity can measure the temperature and gas pressure simultaneously in a high temperature environment.The accuracy of the theory is verified experimentally by comparing two different sensors A variety of different sensors are used to verify the accuracy of the theory experimentally.This paper is aimsed at the research of optical fiber interferometric high temperature gas pressure sensor,which is of great significance for the health monitoring of key parts of aircraft engine,and provides important technical support.