Sensors, Vol. 18, Pages 1975: Directional Sensitivity of a MEMS-Based Fiber-Optic Extrinsic Fabry –Perot Ultrasonic Sensor for Partial Discharge Detection

Sensors, Vol. 18, Pages 1975: Directional Sensitivity of a MEMS-Based Fiber-Optic Extrinsic Fabry–Perot Ultrasonic Sensor for Partial Discharge Detection
Sensors doi: 10.3390/s18061975
Authors:
Wenrong Si
Chenzhao Fu
Delin Li
Haoyong Li
Peng Yuan
Yiting Yu

Extrinsic Fabry–Perot (FP) interferometric sensors are being intensively applied for partial discharge (PD) detection and localization. Previous research work has mainly focused on novel structures and materials to improve the sensitivity and linear response of these sensors. However, the directional response behavior of an FP ultrasonic sensor is also of particular importance in localizing the PD source, which is rarely considered. Here, the directional sensitivity of a microelectromechanical system (MEMS)-based FP ultrasonic sensor with a 5-μm-thick micromechanical vibrating diaphragm is experimentally investigated. Ultrasonic signals from a discharge source with varying incident angles and linear distances are measured and analyzed. The results show that the sensor has a 5.90 dB amplitude fluctuation over a ±60° incident range and an exciting capability to detect weak PD signals from 3 m away due to its high signal–noise ratio. The findings are expected to optimize the configuration of a sensor array and accurately localize the PD source.

Source: Sensors - June 20, 2018 Category: Biotechnology Authors: Wenrong Si Chenzhao Fu Delin Li Haoyong Li Peng Yuan Yiting Yu Tags: Article Source Type: research