Abstract
In this paper, a Fabry–Pérot interference fiber sensor was fabricated by using a Polyvinyl chloride membrane (20 μm in thickness) attached at the end of a ferrule with an inner diameter of 1.1 mm. In consideration of the vibration response of the membrane, the feature of the first-order natural frequency of membrane was analyzed by COMSOL Multiphysics. The acoustic sensing performance of the Fabry–Pérot fiber interference sensor was studied in air. The results reveal that the sensor possessed good acoustic pressure sensitivity, in the order of 33.26 mV/Pa. In addition, the noise-limited minimum detectable pressure level was determined to be 58.9 μPa/Hz1/2 and the pressure-induced deflection obtained was 105 nm/Pa at the frequency of 1 kHz. The response of the sensor was approximately consistent with the reference sensor from 1 to 7 kHz. All these results support that the fabricated Fabry–Pérot fiber interference sensor may be applied for ultra-sensitive pressure sensing applications.
Highlights
Ultra-sensitive sensing technology has important applications in many fields, such as acoustic wave acquisition, acoustic source location, acoustic imaging, fault voiceprint detection and early warning
Considering the response characteristics of the sensor, we investigated the output thedifferent response characteristics of theLabview sensor, we output ofConsidering the Fabry–Pérot interference (FPI) under sonic pressure levels
After eliminating the DC component, Fig-6 of 9 ure 5 shows the output voltage peak-to-peak value of the FPI obtained by the photo-detector at the frequency of 1 kHz
Summary
Ultra-sensitive sensing technology has important applications in many fields, such as acoustic wave acquisition, acoustic source location, acoustic imaging, fault voiceprint detection and early warning. With the uninterrupted development of power systems and the increasing demand for power supply reliability in civil fields, the maintenance mode of large power equipment has been gradually transformed from regular maintenance to condition monitoring In these oil and gas monitoring technologies, PAS has plenty of outstanding aspects, such as satisfying gas selectivity and low cross-interference [10]. Fewer-layer graphene films with a diameter of 125 μm and a thickness of 100 nm achieve a pressure sensitivity of 1.1 nm/Pa [14] They only focus on obtaining a higher first-order resonance frequency to obtain a wider frequency response range and are not optimized for the sensors required for a resonant PAS. The frequency response of the sensor was approximately consistent with the reference sensor below 7 kHz
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