Research on reflective intensity-modulated fibre-optical pressure sensor based on desensitisation of temperature compensation method
by Baili Zhang; Zhiguo Gao; Hongying Guo; Wei Qin
International Journal of Wireless and Mobile Computing (IJWMC), Vol. 27, No. 2, 2024

Abstract: To address the need for pressure detection in oil field wells with large temperature fluctuations, this paper studies the Reflective Intensity-Modulated Fibre-Optic Pressure Sensor (RIM-FOPS) technology based on temperature compensation method desensitisation. A new type of Fibre Bragg Grating (FBG) pressure sensor with temperature compensation based on a flat sheet structure is discussed. As a pressure sensitive thin plate of elastomer, its hard core pulls the pressure sensitive FBG, through a rigid displacement transmission mechanism. Temperature desensitisation is solved by passive temperature compensation and real-time correction of residual temperature effect. Theoretical analysis and experiments show that the sensor system can effectively eliminate the influence of factors such as fluctuation of luminous power of light source, change of optical fibre loss and interference of ambient light. The linearity of pressure detection reaches 99.95%, while the temperature detection linearity reaches 99.3%. The repeatability is 0.055% F.S., and the hysteresis error is 0.819% F.S. The sensor accuracy is 0.441% F.S.

Online publication date: Thu, 01-Aug-2024

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