光学学报, 2015, 35 (5): 0512006, 网络出版: 2015-04-20   

基于线阵CMOS型空时滤波器的新型空间滤波测速仪

A Novel Spatial Filtering Velocimeter Based on Linear CMOS-Type Spatiotemporal Filter
作者单位
国防科学技术大学光电科学与工程学院, 湖南 长沙 410073
摘要
为了消除速度测量中的方向模糊以及减小测量不确定度,建立了一套基于空时滤波器的新型空间滤波测速仪。设计了一种基于高速互补金属氧化物半导体(CMOS)线阵图像传感器的空时滤波器,并从理论上分析了该类型空时滤波器的滤波特性。采用了快速傅里叶变换法分析输出信号的频谱,并通过能量重心法对频谱进行校正,减小了频率测量不确定度。使用这种新型测速仪对传送带的平移速度进行了测量。实验验证了该空时滤波器对运动方向辨别的可行性。同时,通过实验还分析了速度测量相对标准不确定度。实验结果表明使用空时滤波器的空间滤波测速仪可以使速度测量相对标准不确定度在频率测量相对标准不确定度的基础上大大降低。降低后的速度测量相对标准不确定度小于0.24%,该值还可以通过合理选择空时滤波器的参数来进一步减小。
Abstract
In order to eliminate directional ambiguity and to reduce standard uncertainty in velocity measurement, a novel spatial filtering velocimeter based on a spatiotemporal filter is established. The spatiotemporal filter is structured by a high speed complementary metal oxide semiconductors (CMOS) linear image sensor. The spatial filtering characteristic of the filter is analyzed theoretically. The power spectrum of the output signal is obtained by fast Fourier transform (FFT), and is corrected by a frequency spectrum correction algorithm, named energy centrobaric correction. Therefore, the standard uncertainty of frequency measurement is reduced. This novel velocimeter is used to measure the moving velocity of a conveyor belt. The experiment verifies the feasibility of the spatiotemporal filter for directional discrimination. Furthermore, the relative standard uncertainty of velocity measurement is analyzed experimentally. Experimental results of the presented spatial filtering velocimeter using spatiotemporal filter show that the relative standard uncertainty of velocity measurement is much reduced compared with that of frequency measurement. The reduced relative standard uncertainty of velocity measurement is below 0.24% , which can be further reduced by adjusting the parameters of the spatiotemporal filter.

何鑫, 龙兴武, 周健, 聂晓明. 基于线阵CMOS型空时滤波器的新型空间滤波测速仪[J]. 光学学报, 2015, 35(5): 0512006. He Xin, Long Xingwu, Zhou Jian, Nie Xiaoming. A Novel Spatial Filtering Velocimeter Based on Linear CMOS-Type Spatiotemporal Filter[J]. Acta Optica Sinica, 2015, 35(5): 0512006.

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