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Vol. 32, No. 8(2), S&M2292

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Sensors and Materials
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Sensors and Materials, Volume 31, Number 5(1) (2019)
Copyright(C) MYU K.K.
pp. 1407-1417
S&M1867 Research Paper of Special Issue
https://doi.org/10.18494/SAM.2019.2260
Published: May 16, 2019

A Fiber Optic Ultrasonic Sensor Using Polarization-maintaining Fiber for Partial Discharge Monitoring [PDF]

Xuefeng Li, Hexin Cao, Zhiming Chang, Xinyu Zhang, Weishi Zhao, and Runjie Shen

(Received July 4, 2018; Accepted March 13, 2019)

Keywords: partial discharge, nondestructive testing, PM-PCF, PANDA fiber

Conventional acousto-ultrasonic piezoelectric sensors can be easily interfered in strong electromagnetic environments such as partial discharge (PD). Current research shows that the effective refractive index difference between two orthogonal polarization modes increases differently with external pressure. Light output intensity can be detected by interference demodulation and depolarization from the polarization-maintaining fiber (PMF) between the two orthogonal polarization modes, and then pressure variations can be obtained. In this study, a new type of acousto-ultrasonic sensor based on the principle of polarization interference is designed to detect PD-induced ultrasonic signals. Simulation and experimental results are also discussed by comparing the following two types of PMFs as the sensing unit: polarization-maintaining photonic crystal fiber (PM-PCF) and polarization-maintaining and absorption-reducing (PANDA) fiber. Analysis results have indicated that the PM-PCF has a higher sensitivity towards external pressure, because its birefringence has a linear relationship of 2.02 × 10−6 RIU/MPa, far beyond 3.01 × 10−11 RIU/MPa of the PANDA fiber. Then, the function between external pressure and light output intensity can be analyzed. The proposed fiber optic sensor using the PM-PCF as the sensing unit has a higher signal-to-noise ratio (SNR). Therefore, this type of sensor can more easily find the initial failure of equipment.

Corresponding author: Runjie Shen


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Cite this article
Xuefeng Li, Hexin Cao, Zhiming Chang, Xinyu Zhang, Weishi Zhao, and Runjie Shen, A Fiber Optic Ultrasonic Sensor Using Polarization-maintaining Fiber for Partial Discharge Monitoring, Sens. Mater., Vol. 31, No. 5, 2019, p. 1407-1417.



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