Sensing location of an object

Details Sensing location of an object Sensing location of an object

1983-01-27

1986-03-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

33503, G01N 2186

Patent

active

045741999

ABSTRACT:
An apparatus and method for sensing the presence or location of an object in a plane perpendicular to a reference axis is disclosed. An optical detector using triangulation techniques is used to sense the presence or rough location of the object. A contact detector is then used to determine the precise location of the object. The presence or location of the object can also be detected in a plane including the reference axis. The probe device containing the two detectors is preferably moved quickly while the rough location is determined and more slowly to determine the precise location. The contact detector can be an optical contact probe moved by an auxiliary moving device attached to a main moving device. Various optical contact detectors are also disclosed.

REFERENCES:
patent: 4089608 (1978-05-01), Hoadley
patent: 4364178 (1982-12-01), Huet
patent: 4427880 (1984-01-01), Kanade et al.
patent: 4451988 (1984-06-01), McMurtry

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