Jun YANG, Yadong YAN, Qi LI, Guokai SHI, Zhao WANG, Yang ZHANG, Suoqi ZHANG, Junhua HE. Design of Spatial Resolution PDV Probe Based on Double Telecentric Lens[J]. Acta Photonica Sinica, 2021, 50(7): 139
- Acta Photonica Sinica
- Vol. 50, Issue 7, 139 (2021)
Fig. 1. Principle diagram of side-axis heterodyne structure photonic Doppler velocimetry
Fig. 2. Principle diagram of multipoint velocity measurement system
Fig. 3. Drawings of tight line array of fibers and photography of 8 fibers in the middle being illuminated by laser @632.8 nm
Fig. 4. Diagram of optical system structure
Fig. 5. Image spot diagram of optical system （focus position）
Fig. 6. Image spot diagram of optical system （defocusing distance of -5 mm）
Fig. 7. Image spot diagram of optical system （defocusing distance of +5 mm ）
Fig. 8. Layout of the probe
Fig. 9. Section view of the lens
Fig. 10. Schematic diagram of positioning structure
Fig. 11. Schematic diagram of 5D regulating structure
Fig. 12. Test system and control software for assembly and adjustment
Fig. 13. The distribution of spots captured by the beam quality analyzer at three different positions along the optical axis
Fig. 14. Power distribution of spots in X direction at beam waist
Fig. 15. Power distribution of spots in X direction obtained by BP209 at three different positions
Fig. 16. Variation curves of laser power received by measured fiber and adjacent fiber with displacement of reflected target
Fig. 17. Curves of receiving efficiency of each fiber in probe with displacement of reflected target
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Table 1. Technical requirements for spatial resolution PDV probe
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Table 2. Spot diagram parameters at three different positions of image plane
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Table 3. The X direction coordinates of the central of each spot measured by BP209 at three different positions
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Table 4. The X direction diameter of each spot measured by BP209 at three different positions
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Table 5. Receiving efficiency of each fiber in probe at three different positions of reflected target
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