Apparatus for detecting the distance between two objects
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United States of America Patent
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-
Jul 1, 1997
Grant Date -
N/A
app pub date -
Dec 1, 1995
filing date -
Dec 1, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical scanner transmits a light beam from the forward end of a moving track vehicle with the beam inclined toward the direction of movement toward another vehicle on the track. A highly reflective retroreflector tape is secured to the rear end of the other vehicle having an effective reflector region offset from the location of the transmission of the beam at the scanner. The angle of inclination and the amount of offset geometry are proportional to the distance between the vehicles. The scanner senses the return beam which is coaxial with the transmitted beam using a Schmitt trigger circuit to sense the threshold level of the returned beam. The resulting output signal is used to stop the moving vehicle at a predetermined spacing from the other vehicle.
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