PROJECT TITLE :
Highly Stabilized Phase-Shifted Fiber Bragg Grating Sensing System for Ultrasonic Detection
A part-shifted fiber Bragg grating (PS-FBG) sensing system based on Pound–Drever–Hall (PDH) technique is proposed and experimentally demonstrated for ultrasonic detection. The sensing system is extremely stabilized as the laser is frequency locked to the PS-FBG resonance using PDH technique. This theme reduces the result of laser intensity noise and permits high-sensitivity ultrasonic detection by monitoring the error signal of frequency detuning between the laser and therefore the PS-FBG resonance. Response of the frequency-locked PS-FBG to ultrasound is finished by testing the ultrasonic refection of a zero.4-mm plastic film, immersed in water. The sensor exhibits a high signal-to-noise ratio of 48 dB at 200 kHz and a noise-restricted detectable strain of eight.7 $textpvarepsilon $ on top of ten kHz. Frequency response of PS-FBG from 100 kHz to one MHz was additionally characterized.
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