Yunyun Wang, Junbin Huang, Peng Ding, Hongcan Gu, Wenzhang Song, Dan Xu, Honglin Zhao, Xuan Zhou. Real-Time Correction Homodyne Symmetry Algorithm to Demodulate DFB Fiber Laser Hydrophone[J]. Chinese Journal of Lasers, 2021, 48(13): 1306001
- Chinese Journal of Lasers
- Vol. 48, Issue 13, 1306001 (2021)
Fig. 1. Homodyne symmetric demodulation system based on 3×3 coupler
Fig. 2. Block diagram of NPS demodulation algorithm
Fig. 3. Real-time correction NPS fiber laser hydrophone signal demodulation system
Fig. 4. Block diagram of a fiber laser hydrophone signal demodulation method for real-time correction of NPS
Fig. 5. DC component and AC component of different periods. (a) DC component coefficient; (b) AC component coefficient
Fig. 6. Interference signals before and after normalization. (a) Before normalization; (b) after real-time normalization
Fig. 7. Demodulation effect before and after real-time correction. (a) Before correction; (b) after real-time correction
Fig. 8. Demodulation effect after loading 200 Hz and 4000 Hz sinusoidal signals. (a) Loading a sinusoidal signal of 200 Hz;(b) loading the sinusoidal signal at 4000 Hz
Fig. 9. Demodulation effect of continuous operation within 15 h. (a) Time domain spectrum; (b) spectrum in the frequency domain
Fig. 10. Experimental diagram of vibrating liquid column test method
Fig. 11. Real-time corrected interference signal in the experiment and experimental demodulation effect. (a) Real-time corrected interference signal in the experiment; (b) experimental demodulation effect
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