Method for mobile survey of road surface
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United States of America Patent
Stats
-
Jan 10, 1989
Grant Date -
N/A
app pub date -
Apr 11, 1986
filing date -
Oct 3, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A road surface illuminated by sunlight is scanned with a laser beam at right angles to the direction of travel, the intensity of the laser beam being intensity modulated with a predetermined frequency; laser beams reflected from the road surface are received and optically filtered to filter out light having frequencies outside that of the laser beam. The optically filtered laser beam strikes a plurality of beam position sensing elements from which respective electrical signals are derived. The resulting electrical signals are then multiplexed and electrically band-pass filtered wherein the center frequency of the band-pass filtering coincides with the frequency at which the laser beam is intensity modulated.
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