期刊
OPTICS LETTERS
卷 45, 期 9, 页码 2526-2529出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.389708
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资金
- National Natural Science Foundation of China [61901021]
- Fundamental Research Funds for the Central Universities
- Beijing Natural Science Foundation [4182032]
- Young Elite Scientists Sponsorship Program by CAST [2017QNRC001]
- National Key Research and Development Project [2018YFB2003200]
Fabry-Perot-based ultrasound sensors at fiber tips have performed high sensitivity and immunity of electromagnetic interference with a relatively compact size. Nevertheless, the reverberation at fiber tips causes a strong noise that degrades the sensing capability. Here we propose a fiber optical-based ultrasound sensor with three design approaches to reduce the reverberation, including designs with an eccentric core, absorptive shield, and arc edge. The effect was experimentally validated with a photoacoustic signal excitation. Compared with bare single-mode fibers in simulation, the low-reverberation design increased the signal-to-noise ratio by 32.1 dB with identical excitation. The experimental results demonstrated the clean response with almost invisible reverberations, which was validated by a commercial hydrophone. This research solved the reverberation problems and provided a low-noise design for fiber optic ultrasound sensing. (C) 2020 Optical Society of America
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