一种基于聚苯硫醚薄膜的高灵敏度光纤声波传感器

A high sensitivity optical fiber acoustic wave sensor based on polyphenylene sulfide film

提出了一种基于聚苯硫醚(PPS)薄膜的高灵敏度光纤声波传感器,利用PPS薄膜和光纤端面构建法布里—珀罗(F-P)腔,通过PPS薄膜受压形变调制F-P腔长,实现高效声光换能。传感PPS薄膜形变灵敏度可达66.11 nm/Pa。采用功率解调方法,实现了50 Hz~20 kHz频率范围内声波探测,灵敏度高达549.8 mV/Pa,信噪比达57 dB,最小可探测声压为28 dB。

A high sensitivity optical fiber acoustic wave sensor based on polyphenylene sulfide(PPS)film is proposed.Fabry-Perot(F-P)cavity is constructed by the PPS film and optical fiber end face.To achieve high efficient acoustic and optical energy conversion, the length of F-P cavity is modulated by compressive deformation of the PPS film.The deformation sensitivity of the sensing PPS diaphragm is up to 66.11 nm/Pa.By using the power demodulation method, acoustic wave detection is achieved in the frequency range of 50 Hz~20 kHz, the sensitivity of the sensor is up to 549.8 mV/Pa, with a signal to noise ratio of 57 dB,and the minimum detectable sound pressure of the sensor is 28 dB.