Acta Photonica Sinica, Volume. 50, Issue 7, 139(2021)
Design of Spatial Resolution PDV Probe Based on Double Telecentric Lens
Figures & Tables(22)
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. 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. 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. 15. Power distribution of spots in
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
Table 1. Technical requirements for spatial resolution PDV probe
View tableView in ArticleTable 1. Technical requirements for spatial resolution PDV probe
Parameter Specification Fiber type SM fiber Number of fibers 8 NA 0.14 Mode field diameter/μm 10 Wavelength/nm 1 550 Spatial distribution of
measured points on target
Distribute in 5mm straight line Displacement of target/mm ±5
Table 2. Spot diagram parameters at three different positions of image plane
View tableView in ArticleTable 2. Spot diagram parameters at three different positions of image plane
Waist position Waist position -5 mm Waist position +5 mm No. Coordinate of fibers / μm Coordinate of spots / μm RMS diameter of spots / μm Coordinate of fibers / μm Coordinate of spots / μm RMS diameter of spots / μm Coordinate of fibers / μm Coordinate of spots / μm RMS diameter of spots / μm 1 63.5 358 22 63.5 357 189 63.5 357 188 2 190.5 1 070 22 190.5 1 070 186 190.5 1 071 188 3 317.5 1 783 24 317.5 1 783 181 317.5 1 782 195 4 444.5 2 489 39 444.5 2 496 173 444.5 2 488 207
Table 3. The
X direction coordinates of the central of each spot measured by BP209 at three different positionsView tableView in ArticleTable 3. The
X direction coordinates of the central of each spot measured by BP209 at three different positionsWaist position Waist position -5 mm Waist position +5 mm No. Coordinate / μm Pitch / μm magnification Coordinate / μm Pitch / μm magnification Coordinate / μm Pitch / μm magnification 1 -2 254 715 5.630 -2 210 703 5.535 -2 241 721 5.677 2 -1 539 712 5.606 -1 507 699 5.504 -1 520 710 5.591 3 -827 713 5.614 -808 705 5.551 -810 714 5.622 4 -114 714 5.622 -103 698 5.496 -96 725 5.709 5 600 711 5.598 595 702 5.528 629 703 5.535 6 1 311 714 5.622 1 297 699 5.504 1 332 716 5.638 7 2 025 716 5.638 1 996 704 5.543 2 048 725 5.709 8 2 741 2 700 2 773 Mean 5.619 5.523 5.640
Table 4. The
X direction diameter of each spot measured by BP209 at three different positionsView tableView in ArticleTable 4. The
X direction diameter of each spot measured by BP209 at three different positionsPosition of BP209 Diameter of gauss beam / μm Spot 1 Spot 2 Spot 3 Spot 4 Spot 5 Spot 6 Spot 7 Spot 8 Waist position 184 143 128 115 109 148 179 202 Waist position +5mm 253 198 199 193 202 224 248 247 Waist position -5mm 306 236 237 220 249 294 312 315
Table 5. Receiving efficiency of each fiber in probe at three different positions of reflected target
View tableView in ArticleTable 5. Receiving efficiency of each fiber in probe at three different positions of reflected target
Position of target Receiving efficiency of each fiber in probe Fiber 1 Fiber 2 Fiber 3 Fiber 4 Fiber 5 Fiber 6 Fiber 7 Fiber 8 Peak position +5 mm 1.24×10-5 1.41×10-5 5.79×10-6 4.41×10-5 2.32×10-5 6.80×10-6 7.08×10-6 9.70×10-6 Peak position 7.95×10-5 7.39×10-5 7.29×10-5 1.34×10-4 2.06×10-4 1.34×10-4 7.66×10-5 6.78×10-5 Peak position -5 mm 1.35×10-5 3.26×10-5 9.01×10-6 3.14×10-5 2.25×10-5 6.70×10-6 3.44×10-5 9.67×10-6
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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
Paper Information
Category: Instrumentation, Measurement and Metrology
Received: Jul. 21, 2020
Accepted: Feb. 4, 2021
Published Online: Sep. 1, 2021
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