为了提高梳状结构光学测速系统的测速精度, 采用数学原理研究了梳状结构的间距大小对输出光强信号周期性的影响, 通过优化输出光强信号的周期性来提高测速精度, 并采用一种结合图像处理选择最佳间距的实验方法, 进行了相关的理论分析, 对两种不同路面进行了实验仿真验证, 得到不同间距下不同的输出光强信号的周期性情况。结果表明, 当栅状结构的间距大小与地面特征点大小一致时, 得到的输出光强周期性最优, 对于普通的柏油和水泥路面, 对应到地面的最佳栅状结构间距大小为1.0mm ~1.5mm。

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.