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《Acta Optica Sinica》 2008-01
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Physical Mechanism and Solution of Aliasing in Phase Generated Carrier Modulation-Demodulation of Interferometric Fiber-Optic Hydrophone

Wang Zefeng Hu Yongming Meng Zhou Ni Ming Xiong Shuidong(College of Photoelectric Science and Engineering,National University of Defense Technology,Changsha,Hunan 410073,China)  
Signal aliasing is one of puzzling questions of a practical fiber-optic hydrophone system based on phase generated carrier(PGC) modulation-demodulation.The physical mechanism of signal aliasing is analyzed theoretically and simulated by computer.The results show that increasing the modulation frequency and lowering the sensitivity of the fiber-optic hydrophone cannot effectively resolve the signal aliasing induced by high-frequency interfering signal.A novel acoustic low-pass filtering scheme is proposed based on the principle of acoustic low-pass filters.A simple fiber-optic hydrophone with an acoustic low-pass filter is designed and fabricated.The acoustic pressure phase sensitivity is measured in a standard standing-wave duct.The experimental results show that the fiber-optic hydrophone has fine characteristics of acoustic low-pass filtering,and can restrain the high-frequency interfering signal strongly.The low-frequency acoustic sensitivity is about-140 dB(0 dB=1 rad/μPa),the attenuation of high frequency is bigger than 20dB.The scheme is very simple and economical,can be used to eliminate the signal aliasing in a practical phase generated carrier modulation-demodulation system effectively.
【Fund】: 国家863计划(2006AA09Z121);; 国防科技大学优秀研究生创新项目(0623)资助课题
【CateGory Index】: TB565.1
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