Title :
Velocity measurement using phase orthogonal spatial filters
Author :
Nomura, Masakatsu ; Hori, Michitaka ; Shimomura, Junichi ; Terashima, Masayuki
Author_Institution :
R&D Center, Meidensha Corp., Tokyo, Japan
Abstract :
An optical pattern on an object´s surface is converted into a component of a specific spatial frequency through a spatial filter, and the movement or the velocity of the object can be estimated from the spatial frequency. An error of the velocity measurement based on the conventional spatial filter method is large in case of low-speed measurement. The authors develop a velocity measurement system based on a new spatial filter method that can compensate the error. This paper presents the system configuration and the compensating method
Keywords :
error compensation; measurement errors; measurement theory; spatial filters; velocity measurement; compensating method; error compensation; low-speed measurement; optical patterns; phase orthogonal spatial filters; spatial frequency component; velocity measurement; Frequency conversion; Frequency estimation; Frequency measurement; Object detection; Optical devices; Optical filters; Optical frequency conversion; Optical sensors; Spatial filters; Velocity measurement;
Journal_Title :
Industry Applications, IEEE Transactions on
