System for detecting the position of observation spot

Details System for detecting the position of observation spot System for detecting the position of observation spot

1992-04-29

1993-11-09

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

180169, 364449, G01B 1100

Patent

active

052607704

ABSTRACT:
In a system for detecting a relative position of an observation spot and reference points fixed around the observation spot, a central axis of mirror rotation is precessed to draw a substantially conical locus so that a light beam is vertically vibrated, the azimuth of the rotative scanning direction and the precessional angle are stored when the light beam reflected by a light reflector at the reference point is detected, then the projection direction of the light beam is fixed at the detected rotative scanning and precession angles, the distance between the observation spot and the light reflector is measured on the basis of the detected signals, and the positions of the light reflectors with respect to the observation spot are calculated on the basis of the measured distances and azimuths.

REFERENCES:
patent: 5011288 (1991-04-01), Noji et al.
patent: 5014204 (1991-05-01), Kamimura et al.

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