Fringe Visibility Enhanced Fiber-Optic Fabry-Perot Interferometric Sensor for Highly Sensitive Ultrasound Detection

摘要

A fringe visibility enhanced fiber-optic Fabry-Perot functionalized diaphragm based ultrasonic sensor is proposed and experimentally demonstrated for ultrasound sensing. The sensor consists of a fiber-optic collimator and a PTFE diaphragm to form a Fabry-Perot interferometer. Due to the significantly increase in the slope of the sensor spectral sideband and the smaller Younga??s modulus of the PTFE, a high response to both continuous and pulsed ultrasound with a high SNR of 42.92 dB in 300 kHz is achieved when the spectral sideband filter technique is used to interrogate the sensor.