Distance indicating devices
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United States of America Patent
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-
Oct 5, 1982
Grant Date -
N/A
app pub date -
Oct 24, 1980
filing date -
Oct 30, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A distance indicating device comprises a probe having therein a light source and light sensitive element to receive light reflected from the surroundings of the probe. A reference point is movable relative to the probe. The light sensitive element gives rise to an electric signal. A first storage means stores a signal representing the maximum reflected light returned to the light sensitive element. A second storage means stores a signal representing the light returned to the light sensitive element representing the minimum reflected light. A selection means selects a signal level between the maximum and minimum stored signals' and a measuring element measures the distance between the reference point and a further reference point, associated with the probe, when the signal level reaches the selected signal level.
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