Cycle optimizing method used in optical velocity measurement systems based on grid structure
-
1.
School of Instrumention Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China
-
Corresponding author:
OU Pan, oupan@buaa.edu.cn
;
-
Received Date:
2013-12-12
Accepted Date:
2014-04-16
-
Abstract
In order to improve the measurement precision of optical velocity measurement systems based on grid structure, effect of spacing size of the grid structure on the period of output light intensity signal was studied using mathematical principles. Combined with image processing, optimal spacing size was selected so that the period of the output light intensity signal was optimized and the measurement precision was improved. After relevant theoretical analysis, simulation experiments were carried out for two different kinds of roads. The periodic information of different spacing under different output light intensity was obtained. The results show that when the spacing size of the grid structure is consistent with the surface feature point size, the optimum output light intensity period is obtained. For ordinary asphalt and concrete pavement, the best spacing is 1.0mm~1.5mm corresponding to the ground.
-
-
References
|
[1]
|
ZHANG Y, CAI C Q, SUN Q. The testing technology of automotive vehicle velocity measurement at home and abroad[J].Chinese Measurement, 2007,33(4):69-70 (in Chinese). |
|
[2]
|
XIE H B, GONG R M, HAN L, et al. Optical system design of a portable laser Doppler velocimeter[J]. Laser Technology, 2011, 35(1): 109-111 (in Chinese). |
|
[3]
|
ZHAO S J, ZHANG P, ZHANG Y Q, et al. Velocity measurement techniques based on laser feedback effect[J]. Laser Technology, 2012, 36(2):160-164 (in Chinese). |
|
[4]
|
ATOR J T. Image-velocity sensing with parallel-slit reticles[J]. Journal of the Optical Society of America, 1963, 53(12):1416-1419. |
|
[5]
|
CHEN Z Z, ZHU X L. Speed measurement photo-electricity sensor and its signal adjustment circuit[J]. Journal of Transducer Technology, 2002, 21(8):53-58 (in Chinese). |
|
[6]
|
AIZU Y, ASAKURA T. Principles and development of spatial filtering velocimetry[J]. Journal of Applied Physics, 1987, B43(4):209-224. |
|
[7]
|
SCHAEPER M, DAMASCHKE N. Velocity measurement for moving surfaces by using spatial filtering technique based on array detectors[C]// Second International Conference, Autonomous and Intelligent Systems 2011. Heidelberg, Berlin, Germany: Springer-Verlag, 2011, 6752: 303-310. |
|
[8]
|
ZHENG L N, ZHANG T, KUANG H P, et al. Image motion velocity measurement technique based on spatial filtering effect of line CCD for aerial camera[J]. Acta Optica Sinica, 2012, 32(11): 1112002(in Chinese). |
|
[9]
|
ZHOU F, ZHAO C Y, HUANG Z Y, et al. Time-domain linear interpolation algorithm and its error analysis for estimating signal period [J].Chinese Journal of Scientific Instrument, 2011, 32(8): 1725-1730 (in Chinese). |
|
[10]
|
USHIZAKA T, ASAKURA T. Measurements of flow velocity in a microscopic region using a transmission grating[J]. Applied Optics, 1983, 22(12):1870-1874. |
|
[11]
|
HAN B, TONG Y, LI J. Flow velocity measurement by spatial filter and experimental research[J]. International Symposium on Modern Measuring Techniques for Multiphase Flows, 1996, 36(12): 356-363. |
|
[12]
|
AIZU Y, USHIZAKA T, ASAKURA T. Measurement of flow velocity in a microscopic region using a transmission grating: a differential type [J]. Applied Optics, 1985, 24(5):627-635. |
|
[13]
|
GONZALEZ R C, WOODS R E. Digital image processing[M].Beijing:Publishing House of Electronics Industry, 2007: 8(in Chinese). |
-
-
Proportional views
-
Map
DownLoad: