G - Physics – 01 – P
Patent
G - Physics
01
P
354/32, 73/53
G01P 3/36 (2006.01)
Patent
CA 2013576
METHOD OF AN APPARATUS FOR MEASURING A VELOCITY VECTOR BY USE OF A SPATIAL FILTER ABSTRACT OF THE DISCLOSURE At least a set of two spatial filters are so arranged in a two-dimensional space or three-dimensional space that their spatial distributions are opposite to each other. Two systems of light detection signals from a moving object are synchronously collected through the spatial filters, integrated, and photoelectrically converted into time-series electrical signals. The electric signals are processed according to a predetermined algorithm. A result of the process is judged as positive or negative to find the direction of a velocity of the object. The size of the velocity is found from the two systems of light detection signals according to a known equation. Instead of oppositely arranging the spatial distributions of the two spatial filters, at least one differential spatial filter system may be employed to provide light detection signals corresponding to those provided by the oppositely arranged spatial filters.
Amari Yasufumi
Perley-Robertson Hill & Mcdougall
Secom Co. Ltd.
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