Yichao JIANG, Shaojie GU, Gang ZHANG, Linguang XU, Qiang GE, Xuqiang WU, Benli YU. Improved Phase Generated Carrier Demodulation Algorithm for Laser Vibration Measurement[J]. Acta Photonica Sinica, 2024, 53(1): 0114005
- Acta Photonica Sinica
- Vol. 53, Issue 1, 0114005 (2024)
Fig. 1. Schematic of the improved PGC demodulation algorithm for laser vibrometers
Fig. 2. Fitting results of the two algorithms for the simulated data
Fig. 3. Experimental setup
Fig. 4. Lissajous figures under different amplitudes of the LFM
Fig. 5. Waveform and spectrum of the voltage signal corresponding to interference light detected by PD
Fig. 6. Time domain waveform of two quadrature signals after low pass filtering
Fig. 7. Lissajous figures before and after ellipse fitting under different LFM
Fig. 8. Spectra of demodulated signals under the stimulating amplitude of 100 mV and different amplitudes of LFM
Fig. 9. Spectrum comparison of demodulated signals of two algorithms
Fig. 10. Lissajous figures of the quadrature signals with different C values
Fig. 11. SINAD and THD of demodulated signal under different C values
Fig. 12. Response linearity and noise floor of the system and waveform and spectrum diagrams of the demodulated signal when THD=1%
Fig. 13. Frequency response of the system's output amplitude
Fig. 14. Waveform and spectrum diagrams of the two demodulated vibration signals of the system
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