Acta Photonica Sinica, Volume. 49, Issue 9, 0912001(2020)
Research on Laser Velocimeter for Overspeed Detection on Highways
Figures & Tables(13)
Fig. 1. Relative positions of light source, moving particle and light detector
Fig. 2. Gaussian beam field distribution and its transmission trough a single lens
Fig. 3. Diagram of beam transformation of double-lens telescopic system
Fig. 6. Two-dimensional image of the spot at the central working distance
Fig. 8. Signals of the system without the conversion lens group and the system with conversion lens group
Table 1. Main technical parameters of laser velocimeter
View tableView in ArticleTable 1. Main technical parameters of laser velocimeter
Parameter Value Wavelength/nm 532 Laser Power/mW 50 mode Single longitudinal Focal length of concave lens/mm -35 Beam conversion lens group Focal length of convex lens/mm 500 Distance between lenses/mm 335 Photodetector APD Beam angle/(°) 75 Signal processing algorithm FFT Central working distance/m 10 Measurement accuracy/% < 0.1 Resolution/(m·s-1) 0.01 Measuring range/(km·h-1) 0~200
Table 2. Experimental results atdifferent velocity levels
View tableView in ArticleTable 2. Experimental results atdifferent velocity levels
Speed level/(km·h-1) Serial number Turntable/(km·h-1) Laser velocimeter/(km·h-1) Accuracy/% 20 1 20.053 221 20.042 6 -0.053 2 20.053 357 20.046 9 -0.032 3 20.053 293 20.055 5 0.011 4 20.053 221 20.038 2 -0.075 5 20.053 150 20.059 8 0.033 6 20.053 007 20.051 2 -0.009 80 1 80.152 359 80.140 3 -0.015 2 80.152 428 80.170 8 0.023 3 80.152 466 80.174 3 0.027 4 80.152 496 80.139 1 -0.017 5 80.152 466 80.108 3 -0.055 6 80.152 390 80.140 8 -0.014 200 1 200.227 173 200.124 0 -0.052 2 200.227 249 200.428 0 0.100 3 200.227 463 200.276 0 0.024 4 200.227 737 200.233 0 0.003 5 200.228 104 200.233 0 0.002 6 200.228 348 200.319 0 0.045
Table 3. Performance comparison of velocimeter products
View tableView in ArticleTable 3. Performance comparison of velocimeter products
Brand Maximum working distance/mm Depth of field/mm Measurement range/(m·min-1) Elovis 500 ±20 0~3 600 POLYTEC 2 500 ±30 0~7 000 BETA 3 000 ±175 0~4 000 Velocimeter in this paper 10 000 ±1 000 0~3 600
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Wen-tao LI, Hao TANG, Jian ZHOU. Research on Laser Velocimeter for Overspeed Detection on Highways[J]. Acta Photonica Sinica, 2020, 49(9): 0912001
Paper Information
Category: Instrumentation, Measurement and Metrology
Received: Jun. 15, 2020
Accepted: Jul. 23, 2020
Published Online: Dec. 26, 2020
The Author Email: ZHOU Jian (1814518660@qq.com)
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