Distance indicating devices

Details Distance indicating devices Distance indicating devices

1980-10-24

1982-10-05

Martin, Jr., William D.

Geometrical instruments

Area integrators

Electrical

33125C, 365149, G01B 502, G01B 1106

Patent

active

043522459

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.

REFERENCES:
patent: 2763935 (1956-09-01), Whaley et al.
patent: 3142822 (1964-07-01), Martin
patent: 3171986 (1965-02-01), Bonner et al.
patent: 3500342 (1970-03-01), Bissett et al.
patent: 3512140 (1970-05-01), Yokozawa et al.
patent: 4078313 (1978-03-01), Hennessy
patent: 4195413 (1980-04-01), Haraguchi et al.
patent: 4270274 (1981-06-01), Hennessy

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