Keywords :
corrugated diaphragm; Fabry-Perot interferometer; optical fiber sensors; ultrasound detection; 3-D printing; 3D-printing; Corrugated diaphragm; Fabry-Perot; Fiber-optics; Fibre tip; Sensitivity; Two photon; Ultrasound detection; Writing; Electronic, Optical and Magnetic Materials; Atomic and Molecular Physics, and Optics; Electrical and Electronic Engineering
Abstract :
[en] A polymer corrugated diaphragm-based fiber-optic Fabry-Perot (FP) interferometer is proposed as an ultrasonic sensor and directly fabricated on an optical fiber tip by direct laser writing via two-photon polymerization. The structure of the corrugated diaphragm is optimized, and the mechanical properties are investigated numerically. The experimental results show that the proposed device has a resonant frequency of 150 kHz and an enhanced mechanical sensitivity of 367.73nm/kPa@100 kHz, and a low noise equivalent level of 1.92 mPa/Hz1/2@100 kHz. The sensitivity is much higher that of FP devices with uniform diaphragm, demonstrating that the designed sensor is capable of detecting weak ultrasonic waves.
Funding text :
This work was supported in part by the National Natural Science Foundation of China under Grant 62005153; and in part by the Natural Science Foundation of Shanghai, China, under Grant 20ZR1420300. The work of Xuehao Hu was supported by the Postdoctoral Researcher Grant (Chargé de Recherches) from Fonds de la Recherche Scientifique (F.R.S.-FNRS).
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