基于钛膜的光纤F-P声波传感器实现
Realization of Optical Fiber F-P Acoustic Sensor Based on Titanium Film
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作者信息
摘要
针对电子式声波传感器易受电磁干扰的问题,根据非本征型法布里-珀罗(EFPI)干涉结构,提出了一种基于钛膜的光纤F-P声波传感器,其利用钛膜受压形变引起F-P 腔长变化实现声光换能.搭建稳定正交工作点的强度解调系统,用于降低温度漂移对解调精度的影响.经实验证明,该传感器干涉光谱消光比约12 dB;能够实现1.5～8 kHz正弦声波信号的探测,系统信噪比约45 dB;在强度响应测试中,拟合曲线的线性度大于0.982,表明传感器具有良好的线性响应关系.
Abstract
To address the susceptibility of electronic acoustic wave sensors to electromagnetic interference,a fiber-optic F-P acoustic wave sensor based on a titanium membrane was proposed according to the EFPI structure,which used the change in F-P cavity length caused by deformation of the titanium membrane under compression to achieve acousto-optic energy conversion.To limit the effect of temperature drift on demodulation accuracy,an intensity demodulation system with stabilized orthogonal working points was designed and used.The extinction ratio of the sensor's interferometric spectrum is approximately 12 dB,it can detect si-nusoidal acoustic signals ranging from 1.5 kHz to 8 kHz,with a signal-to-noise ratio of approximately 45 dB,and the linearity of the fitted curves in the intensity response test is greater than 0.982,indicating that the sensor has a good linear response relationship.
关键词
光纤传感器/声波传感器/法布里-珀罗干涉/光强度解调Key words
optical fiber sensor/acoustic sensor/Fabry-Perot interference/light intensity demodulation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据