Abstract
This article presents an extrinsic fiber-optic acoustic sensor applied for partial discharge (PD) detection in air. A Fabry–Perot (F-P) cavity consisting of a single-mode fiber (SMF) and a graphene oxide (GO) film, whose thickness and effective vibration diameter are approximately 500 nm and 4.377 mm, respectively, is used as this sensing core, and the manufacturing process of GO diaphragms and this sensing probe is illustrated to be simple and controllable. Performance tests indicate that this proposed sensor maintains a linear acoustic-pressure response and a flat frequency response in the range of 200 Hz to 20 kHz, while being an omnidirectional sensor and having high working stability during a ten-day test period. Additionally, PD detection results show that the minimum PD size detected by this proposed sensor in air was approximately 100 pC, which demonstrates that this proposed sensor can achieve high-sensitivity PD detection in air.
Highlights
High-sensitivity detection of partial discharges (PDs) occurring in power equipment insulation can help testing personnel find latent faults earlier, thereby allowing related solutions to be implemented earlier [1,2]
single-mode fiber (SMF) inserted inserted into into optical opticalcaliper, caliper,and andthe the other part incident light continue to propagate the F-P. This part theof light becan partially reflected at the inner of the sensing into thecavity; F-P cavity; thisof part thecan light be partially reflected at thesurface inner surface of the diaphragm and a portion the reflected light can be coupled this SMF
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Summary
High-sensitivity detection of partial discharges (PDs) occurring in power equipment insulation can help testing personnel find latent faults earlier, thereby allowing related solutions to be implemented earlier [1,2]. PDs can instantly compress surrounding media, thereby making surrounding media vibrate, which can produce acoustic signals [6,7]. This type of sensor is very suitable for PD detection, in theory. We used a liquid deposition method to make nanoscale graphene oxide (GO) films, and due to the basically non-conductive, excellent membrane-forming ability, good adhesion and high.
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