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Essential role of residual stress in fiber optic extrinsic Fabry Perot sensors for detecting the acoustic signals of partial discharges

WENRONG SI1, HAOYONG LI2,3, CHENZHAO FU1, PENG YUAN4, YITING YU2,3,*

Affiliation

  1. State Grid Shanghai Electric Power Research Institute , Shanghai 200437 , P . R . China
  2. Key Laboratory of Micro/Nano Systems for Aerospace Ministry of Education )), Northwestern Polytechnical University, Xi’an 710072, P. R. China
  3. Key Laboratory of Micro and Nano Electro Mechanical Systems of Shaanxi P rovince, Northwestern Polytechnical University, Xi’an 710072, P. R. China
  4. Xi an Maorong Power Equipment Co., Ltd., Xi an 710048, P. R. China

Abstract

The effects of residual stress on fiber optic extrinsic Fabry-Perot interferometric (EFPI) sensors for detecting the acoustic signals of partial discharges (PDs) were investigated using the finite element method (FEM). Results indicate that the residual stress in the vibrational membrane may change the natural frequency of the membrane, which would subsequently cause the deviation in the designed performance of the EFPI sensor, including the responsive displacement of the membrane, as well as the sensitivity and resolution of the sensor. According to the design, when the residual stress in the membrane exists, the residual tensile stress makes the responsive sensitivity of the membrane for the EFPI sensor to be increased by 0.017 nm/kPa/MPa (on average) and resolution to be decreased by 0.07 Pa/MPa, while the residual compressive stress takes effect oppositely, as -0.008 nm/kPa/MPa and +0.085 Pa/MPa, respectively..

Keywords

Fabry-Perot sensors, Residual stress, Vibrational membrane, Partial discharges.

Citation

WENRONG SI, HAOYONG LI, CHENZHAO FU, PENG YUAN, YITING YU, Essential role of residual stress in fiber optic extrinsic Fabry Perot sensors for detecting the acoustic signals of partial discharges, Optoelectronics and Advanced Materials - Rapid Communications, 11, 11-12, November-December 2017, pp.637-642 (2017).

Submitted at: Feb. 7, 2017

Accepted at: Nov. 28, 2017