Research on Optical Fiber F-P Temperature Sensor and Its Signal Demodulation System Used in Aero-engine

doi:10.3901/JME.2019.18.001

Abstract

Abstract: Optical fiber F-P temperature sensor with the advantages of stable structure, high precision, small volume, anti-electromagnetic interference, light weight and low cost has potential application in the high temperature measurement of aerial engine. According to the high temperature condition of aero-engine, the F-P temperature sensor is designed based on multi-beam interference principle. The fabrication of optical fiber F-P temperature sensor is completed by means of face detection and microscopic measurement. In order to overcome the shortcomings of the traditional spectrometer demodulation system which is expensive and slow demodulation speed, the signal demodulation system of the sensor is designed with F-P filter and DSP as the core, which overcomes the limitation of the demodulation with traditional spectrometer. The hardware design of the system is carried out, including the principle design, simulation analysis and circuit production of the photoelectric conversion amplifier circuit. Then the sensor is calibrated by standard thermocouple in high temperature furnace with high control precision of temperature. The results show that the temperature response sensitivity of the sensor is 0.012 nm/℃, and the linearity is 0.996 from 30℃ to 1 000℃.

Key words: optical fiber sensor, high temperature measurement, aero-engine, signal demodulation, performance test

CLC Number:

TG156

LIN Qijing, WU Zirong, ZHAO Na, TIAN Bian, JIANG Zhuangde. Research on Optical Fiber F-P Temperature Sensor and Its Signal Demodulation System Used in Aero-engine[J]. Journal of Mechanical Engineering, 2019, 55(18): 1-7.

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