Laser & Optoelectronics Progress, Volume. 56, Issue 15, 150602(2019)
Experimental Study on Ultra-Weak Fiber Bragg Grating Hydrophone Arrays Based on Fizeau Interference
Herein, an ultra-weak fiber Bragg grating hydrophone array system based on Fizeau interference is demonstrated. The ultra-weak fiber Bragg grating hydrophone array is constructed via on-line preparation of a fiber Bragg grating using a drawing tower. The amplitude, frequency, and phase of underwater acoustic signals in a wide frequency range of 2-2000 Hz are simultaneously measured using the signal demodulated by the arc-tangent algorithm. The phase acoustic-pressure sensitivity of the system hydroacoustic signals at 2 Hz reaches -135.81 dB(re rad/μPa). The sensitivity is 2755.49 μPa/ Hz, and the signal-to-noise ratio is 43.785 dB. The experimental results of sensor multiplexing prove that the system can demodulate underwater acoustic information at different locations. Furthermore, the phase acoustic-pressure sensitivity of the system increases with the increasing cavity length of the sensor. The system exhibits very good stability, indicating the possibility of extensive applications in high-sensitivity underwater acoustic sensing, very low frequency acoustic detection, deep-sea monitoring, and other fields.
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Qiannan Xu, Ciming Zhou, Dian Fan, Yandong Pang, Chenguang Zhao, Xi Chen, Junbin Huang, Hongcan Gu. Experimental Study on Ultra-Weak Fiber Bragg Grating Hydrophone Arrays Based on Fizeau Interference[J]. Laser & Optoelectronics Progress, 2019, 56(15): 150602
Category: Fiber Optics and Optical Communications
Received: Jan. 24, 2019
Accepted: Mar. 5, 2019
Published Online: Aug. 5, 2019
The Author Email: Zhou Ciming (zcm@whut.edu.cn)