Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1988-12-27
1991-06-04
Tarcza, Thomas H.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
180169, G01P 336
Patent
active
050209035
ABSTRACT:
In a correlation-type speedometer which determines velocity by calculating stagger time from a maximum value of the correlation function of outputs from two sensors arranged one in front of the other in the direction of movement, use is made of an oblong slit, a sensor whose light-receiving surface has an oblong shape, a diaphragm having an oblong aperture, or lens that is cut leaving an oblong area through which light can pass. The result is formation of a measurement spot having an oblong shape that is narrow in a forward direction of movement and long in a direction at right angles to the forward direction. In another aspect, two sets of light sources and sensors are arranged so that their relative positional relationships are the same, the light sources are made to flash at different periods and the periodicity of the flashing light sources is utilized to eliminate the influence of light entering the sensor of one set from the light source of the other set. In a further apsect, a velocity is sensed from the stagger time from which the correlation function is maximized, and the reflection factor of a road surface is detected from the difference between sensor output when a light source is turned on and off.
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Maekawa Kazuteru
Sakai Satoshi
Aisin Aw Co. Ltd.
Tarcza Thomas H.
Wallace Linda J.
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