Clearance measurement system, video clearance measurement vehicle and improved method of performing clearance measurements
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United States of America Patent
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May 18, 1993
Grant Date -
N/A
app pub date -
Nov 21, 1990
filing date -
Nov 21, 1990
priority date (Note) -
Expired
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Abstract
A clearance measurement system including a video clearance measurement vehicle. The vehicle includes a video camera and a light source which emits a beam of light in a vertically and laterally extending plane. The vehicle can be driven on a railroad track at night to record illuminated portions of obstacles located along the railroad track. Various notes are overlaid on a videotape of the recorded images. The videotapes are used to prepare clearance diagrams or are analyzed by software to determine whether a reference object will pass freely along the track without hitting any of the obstacles.
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