Yu Zhou, Chao Liu, Kunbo Wang, Xiaocun Wei. Double-Beam Thin-Film Interferometric Fiber Microphone Based on Phase Demodulation[J]. Acta Optica Sinica, 2019, 39(1): 0106001
- Acta Optica Sinica
- Vol. 39, Issue 1, 0106001 (2019)
Fig. 1. Working principle of double-beam thin-film interferometric fiber microphone based on phase demodulation
Fig. 2. Structural diagram of double-beam thin-film interferometric fiber microphone
Fig. 3. Principle of three-wavelength phase demodulation algorithm
Fig. 4. Outputs of double-beam thin-film interferometric fiber microphone based on phase demodulation under different signal frequencies. (a) 500 Hz; (b) 1000 Hz; (c) 2000 Hz
Fig. 5. Outputs of double-beam thin-film interferometric fiber microphone based on phase demodulation under different deviations of phase difference. (a) 5°; (b) 10°; (c) 15°
Fig. 6. Outputs of double-beam thin-film interferometric fiber microphone based on phase demodulation under different deviations of DC subentry and AC subentry. (a) 5%; (b) 10%; (c) 15%
Fig. 7. Experimental setup of double-beam thin-film interferometric fiber microphone based on phase demodulation
Fig. 8. Transmission spectrum of double-beam thin-film interferometric fiber microphone
Fig. 9. Test results of double-beam thin-film interferometric fiber microphone based on phase demodulation for different signal frequencies. (a) 500 Hz; (b) 1000 Hz; (c) 2000 Hz
Fig. 10. Frequency response of double-beam thin-film interferometric fiber microphone based on phase demodulation
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