Miao Yu, Mingyang Sun, Yutong He, Chongfu Zhang, Zhifeng Zheng, Qian Kong. Optimization of low frequency response performance of phase sensitive optical time-domain reflectometry system[J]. Infrared and Laser Engineering, 2022, 51(5): 20211125
- Infrared and Laser Engineering
- Vol. 51, Issue 5, 20211125 (2022)
Fig. 1. Schematic diagram of frequency modulated clock signal waveform inside acousto-optic modulator driver
Fig. 2. Schematic diagram of pulse chopper signal waveform input to acousto-optic modulator driver
Fig. 3. Schematic diagram of pulse modulated signal waveform output by acoustooptic modulator driver
Fig. 4. Pulse-modulated signal curves output from a conventional acousto-optic modulated driver
Fig. 5. Clock homologous (red) and clock nonhomologous (blue) ϕ -OTDR coherent detection system structure
Fig. 6. Pulse modulation signal curves of the acoust-optic modulation driver after clock homology control
Fig. 7. 0.1 Hz disturbance signal. (a) Position-time-intensity response diagram of clock homologous system; (b) Position-time-intensity response diagram of clock non-homologous system; (c) Phase demodulation curve of both; (d) Spectrum diagram of both
Fig. 8. [in Chinese]
Fig. 8. 10 Hz disturbance signal. (a) Position-time-intensity response diagram of clock homologous system; (b) Position-time-intensity response diagram of clock non-homologous system; (c) Phase demodulation curve of both; (d) Spectrum diagram of both
Fig. 9. 500 Hz disturbance signal. (a) Position-time-intensity response diagram of clock homologous system; (b) Position-time-intensity response diagram of clock non-homologous system; (c) Phase demodulation curve of both; (d) Spectrum diagram of both
Fig. 10. 1 kHz disturbance signal. (a) Position-time-intensity response diagram of clock homologous system; (b) Position-time-intensity response diagram of clock non-homologous system; (c) Phase demodulation curve of both; (d) Spectrum diagram of both
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