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For the application of ultrasonic detection in low-pressure carbon dioxide medium, we propose a fiber-optic Fabry-Perot (F-P) ultrasonic sensor system based on an edge-stretched circular polymer diaphragm. The diaphragm is fabricated with pre-tension of 200 N/m. The demonstrated demodulation system is based on quadrature phase-shifted demodulation method. By setting the F-P cavity length and the wavelengths...
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