https://scholars.lib.ntu.edu.tw/handle/123456789/631887
標題: | Low-Frequency Vibration Sensor with Dual-Fiber Fabry–Perot Interferometer Using a Low-Coherence LED | 作者: | Wang, Mu Chun Chao, Shou Yen CHUN-YEON LIN Chang, Cheng Hsun Tony Lan, Wen How |
關鍵字: | acoustic wave | coherence | Fabry–Perot interferometer | LED | sensing system | vibration | 公開日期: | 1-八月-2022 | 出版社: | MDPI | 卷: | 12 | 期: | 8 | 來源出版物: | Crystals | 摘要: | In 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. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/631887 | ISSN: | 2073-4352 | DOI: | 10.3390/cryst12081079 |
顯示於: | 機械工程學系 |
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