Fast and High Spatial Resolution Distributed Optical Fiber Sensing Technology and Its Application in Mechanical Deformation and Temperature Monitoring

doi:10.3901/JME.2022.08.096

Abstract

Abstract: For future intelligent variant aircraft, wing deformation monitoring during flight, precision interventional surgery in minimally invasive surgery, automatic trajectory tracking of continuum robots, turbine blade temperature monitoring, etc., are required to counter electromagnetic interference, high precision, and light-weight distributed sensing technology. Developed a fast, high spatial resolution distributed optical fiber sensor prototype based on the optical frequency domain reflectometer. The prototype uses the heterodyne beat signal of the auxiliary interferometer as an external clock. The auxiliary interferometer uses a 300-meter delay fiber to suppress the nonlinear frequency sweeping effect of the light source, and the polarization diversity receiver is used to eliminate the polarization fading effect in the system. The CPU and GPU computing time costs were compared within a 40-meter sensing distance, and the GPU acceleration algorithm was used to increase the sensing speed of the optical frequency domain reflectometer by 20 times. The temperature of turbine blades is monitored, and the spatial resolution of sensing sampling reaches 0.76 mm, and the temperature measurement accuracy reaches 0.4℃. The prototype is used to realize the mechanical deformation monitoring of the two-dimensional flexible panel, and the measurement error is less than 3%.

Key words: distributed optical fiber sensing, optical frequency domain reflectometer, mechanical deformation, high spatial resolution temperature monitoring, GPU acceleration

CLC Number:

TG156

YIN Guolu, JIANG Rui, XU Zhou, ZHOU Lei, NIU Yangyang, LÜ Lei, ZHU Tao. Fast and High Spatial Resolution Distributed Optical Fiber Sensing Technology and Its Application in Mechanical Deformation and Temperature Monitoring[J]. Journal of Mechanical Engineering, 2022, 58(8): 96-104.

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