Wang, Mu ChunMu ChunWangChao, Shou YenShou YenChaoCHUN-YEON LINChang, Cheng Hsun TonyCheng Hsun TonyChangLan, Wen HowWen HowLan2023-06-072023-06-072022-08-012073-4352https://scholars.lib.ntu.edu.tw/handle/123456789/631887In this paper, we propose a dual-fiberoptic Fabry–Perot interferometer (FFPI) sensing system integrated with a low-cost and low-coherence light-emitting diode (LED) as a light source to detect dynamic vibration caused by acoustic waves with a cut-off frequency of 200 Hz. When the acoustic signals are applied, the sensing FFPI on a Styrofoam sheet provides the function of partially transforming the longitudinal energy as the transverse energy generates a phase shift in the sensing FFPI cavity. The light reflected from the sensor is demodulated by the reference FFPI to extract the measurand. The low-power (sub-nW) optical signals are transferred into electrical signals, processed by a designed optical receiver, and recorded for data analysis.acoustic wave | coherence | Fabry–Perot interferometer | LED | sensing system | vibrationjournal article10.3390/cryst120810792-s2.0-85137140878WOS:000846006300001https://api.elsevier.com/content/abstract/scopus_id/85137140878