Structure Design of Rubber Metal Composite Film for Optical Fiber FPI Infrasound Sensor
The sound pressure sensitive film has an important influence on the sensitivity,anti-electromagnetic interference and long-distance attenuation of fiber-optic FPI infrasound sensor.Based on the research status at home and abroad,a new compos-ite film for low-frequency infrasound detection is designed for fiber-optic FPI infrasound sensor system.The static response under uniform compression and the dynamic response in infrasound frequency band are studied by ANSYS software.The results show that the composite film has a very high strain sensitivity in the low frequency infrasound band(nm/PA order of magnitude).Un-der the same pressure load,the rubber film thickness has the greatest influence on the shape variable,while the metal film thick-ness,metal film material and metal film diameter have little influence on the shape variable.The linearity is better when the thickness of rubber film is more than 4μm.The composite film has high strain sensitivity and flat frequency response curve in the low frequency infrasound band.The research results can provide reference for the performance optimization of fiber-optic FPI infra-sound sensor.
Infrasound DetectionFiber-Optic SensorFabry Perot InterferometerComposite Film
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