Infrared and Laser Engineering, Volume. 50, Issue 11, 20210116(2021)
Frequency shift characteristics of laser Doppler effect
Figures & Tables(17)
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. 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
Table 1. Electro-optic modulation heterodyne frequency under static conditions
View tableView in ArticleTable 1. Electro-optic modulation heterodyne frequency under static conditions
Number Frequency 1/Hz Frequency 2/Hz 1 5000210 9990788 2 4999924 9990501 3 5000019 9990501 4 4999828 9990788 5 4999828 9990692 Average frequency 4999962 9990654
Table 2. Heterodyne frequency of electro-optic modu-lation target at 3 mm/s velocity
View tableView in ArticleTable 2. Heterodyne frequency of electro-optic modu-lation target at 3 mm/s velocity
Direction frequency/Hz Relative Opposite f1 4578 5245 f2 4995414 4994774 f3 5004583 5005264 f4 9995433 9994777 f5 10004575 10005252 (f3−f2)/2 4584 5245 (f5−f4)/2 4571 5237
Table 3. Heterodyne frequency value of acousto-optic modulation static target
View tableView in ArticleTable 3. Heterodyne frequency value of acousto-optic modulation static target
Number Frequency/Hz 1 100006938 2 100006938 3 100006938 4 100006819 5 100006819 Average frequency 100006893
Table 4. Heterodyne frequency of acousto-optic modu-lation target at 3 mm/s velocity
View tableView in ArticleTable 4. Heterodyne frequency of acousto-optic modu-lation target at 3 mm/s velocity
Direction frequency/Hz Relative Opposite f1 100002646 100009799 f 2 99999666 100012302 f3 100004077 100011349 f4 100003123 100012302 f5 100000978 100010276 Average frequency 100002098 100011205 fd=f−f0 −4795 4312
Table 5. Comparison of frequency shift characteristics of two modulation methods
View tableView in ArticleTable 5. Comparison of frequency shift characteristics of two modulation methods
Modulation Relative error Direction Dynamic range Insertion loss/dB Connection Electro-optic Smaller Ambiguity Full speed range −3 Fiber Acousto-optic Bigger Distinguishable High speed −1 Fiber
Table 6. Heterodyne frequency of acousto-electric hybrid modulation moving target
View tableView in ArticleTable 6. Heterodyne frequency of acousto-electric hybrid modulation moving target
Direction frequency/Hz Relative Opposite f11 94997525 95011901 f12 95005691 95005798 f 21 99997520 100011897 f22 100005686 100005793 f31 104997515 105011892 f12-f11 −8166 6103 f21-f22 −8166 6104 f31-f32 −8166 6080
Tools
Get Citation
Copy Citation Text
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
Paper Information
Category: Lasers & Laser optics
Received: Feb. 24, 2021
Accepted: --
Published Online: Dec. 7, 2021
The Author Email: Zhu Jingguo (zhujingguo@ime.ac.cn)
© Copyright 2018-2021 | Chinese Laser Press.
All Rights Reserved 沪ICP备15018463号-20