Pressure-gradient fiber laser hydrophone

Wentao Zhang; Faxiang Zhang; Fang Li; Yuliang Liu

doi:10.1117/12.835139

5 October 2009 Pressure-gradient fiber laser hydrophone

Wentao Zhang, Faxiang Zhang, Fang Li, Yuliang Liu

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75033S (2009) https://doi.org/10.1117/12.835139
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

Abstract

A pressure-gradient fiber laser hydrophone (FLH) is demonstrated. Two brass diaphragms are installed at the end of a metal cylinder as the sensing element. There are two orifices at the middle of the cylinder. This structure can work as a pressure-gradient microphone in the acoustic field. Thus the DFB fiber laser fixed at the center of the two diaphragms is elongated or shortened due to the acoustic wave. Theoretical analysis is given based on the electro-acoustic theory. Experiments are carried out to test the performance of the hydrophone. A sensitivity of 100 nm/MPa has been achieved. Furthermore, the hydrostatic pressure is self-compensated and a ultra-thin dimension is achieved based on the proposed structure.

Citation Download Citation

Wentao Zhang, Faxiang Zhang, Fang Li, and Yuliang Liu "Pressure-gradient fiber laser hydrophone", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75033S (5 October 2009); https://doi.org/10.1117/12.835139

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