Distance sensing apparatus and method
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United States of America Patent
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Nov 13, 1984
Grant Date -
N/A
app pub date -
Jun 25, 1981
filing date -
Jun 25, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus for sensing distance between a pair of indicia on a surface moving relative to the apparatus has an interval detector, a sensor and a scale device. The interval detector can respond to movement of the surface. The detector can produce an interval signal signifying the time elapsing during the passage of an interval on the surface of a predetermined length. The sensor is positioned alongside the surface for sensing the arrival times of the pair of indicia at the sensor. The scale device responds to the interval detector and sensor device for producing a distance signal signifying the ratio of the time difference in arrival of the pair to the interval signal.
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