Realization of Optical Fiber F-P Acoustic Sensor Based on Titanium Film
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.
NETL
NSTL
万方数据
