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
- Laser & Optoelectronics Progress
- Vol. 56, Issue 15, 150602 (2019)
Fig. 1. Principle diagram of uwFBG hydrophone array system based on Fizeau interference
Fig. 2. Schematic of arc-tangent demodulation algorithm
Fig. 3. Error curves of phase signal to be demodulated and demodulated phase signal
Fig. 4. Experimental setup of vibration liquid column method
Fig. 5. Time domain diagrams of underwater acoustic signal demodulated by uwFBG hydrophone with sensor's cavity length of 200 m when frequency of signal generator is 2, 10, 100, 500, 1000, 2000 Hz
Fig. 6. Frequency domain diagram of underwater acoustic signal demodulated by the uwFBG hydrophone with sensor's cavity length of 200 m when frequency of signal generator is 2, 10, 100, 500, 1000, 2000 Hz
Fig. 7. Variation of phase acoustic-pressure sensitivity of uwFBG hydrophone at different sensor cavity lengths with increasing frequency
Fig. 8. Variation of phase acoustic-pressure sensitivity of uwFBG hydrophone at different sensor cavity lengths when vibration signal frequency is 10 Hz with amplitude of 10-500 mV
Fig. 9. Time domain diagram of underwater acoustic signal demodulated by four uwFBG hydrophones when vibration signal frequency is 10 Hz with amplitude of 400 mV
Fig. 10. Frequency domain diagram of underwater acoustic signal demodulated by four uwFBG hydrophones when vibration signal frequency is 10 Hz with amplitude of 400 mV
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