Distance indicating devices

Details Distance indicating devices Distance indicating devices

G - Physics

01

B

33/60

G01B 11/00 (2006.01)

Patent

CA 1157257

ABSTRACT A distance indicating device comprising a probe having therein a light source and light sensitive element to receive light reflected from the surroundings of said probe. A reference point movable relative to said probe, the light sensitive element giving rise to an electric signal. A first storage means to store a signal representing the maximum reflected light returned to said light sensitive element. A second storage means to store a signal representing the light returned to said light sensitive element representing the minimum reflected light. A selection means to select a signal level between said maximum and minimum stored signals and a measuring element to measure the distance between the reference point and a further reference point, associated with said probe,when said signal level reaches the selected signal level. - 1 -

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