Kang Cao, Chenghao Jiang, Jingguo Zhu, Juan Du, Zhi Qiao, Zhengyu Ye. Frequency shift characteristics of laser Doppler effect[J]. Infrared and Laser Engineering, 2021, 50(11): 20210116
- Infrared and Laser Engineering
- Vol. 50, Issue 11, 20210116 (2021)
Fig. 1. Optical path structure of laser Doppler velocity measurement system of reference light
Fig. 2. Structure of the electro-optic lithium niobate phase modulator
Fig. 3. Structure of the acousto-optic modulator
Fig. 4. Diagram of frequency modulation of acousto-optic modulator
Fig. 5. Optical path structure of laser Doppler velocity measurement system of reference light
Fig. 6. Spectrum of heterodyne signal of electro-optic modulation static target
Fig. 7. Heterodyne spectrum of electro-optic modulation target at 3 mm/s velocity. (a) Relative movement; (b) Opposite movement
Fig. 8. Frequency spectrum diagram of heterodyne signal of acousto-optic modulation static target
Fig. 9. Heterodyne spectrum of acousto-optic modulation target at 3 mm/s velocity. (a) Relative movement; (b) Opposite movement
Fig. 10. Optical path structure of the acousto-electric hybrid modulation laser Doppler velocity measurement system
Fig. 11. Heterodyne spectrum of acousto-electric hybrid modulation target at 5 mm/s velocity. (a) Relative movement; (b) Opposite movement
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Table 1. Electro-optic modulation heterodyne frequency under static conditions
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Table 2. Heterodyne frequency of electro-optic modu-lation target at 3 mm/s velocity
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Table 3. Heterodyne frequency value of acousto-optic modulation static target
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Table 4. Heterodyne frequency of acousto-optic modu-lation target at 3 mm/s velocity
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Table 5. Comparison of frequency shift characteristics of two modulation methods
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Table 6. Heterodyne frequency of acousto-electric hybrid modulation moving target
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