Precision optical beam divider and position detector

Details Precision optical beam divider and position detector Precision optical beam divider and position detector

1974-09-24

1976-06-29

Wilbur, Maynard R.

Optics: measuring and testing

Angle measuring or angular axial alignment

With photodetection remote from measured angle

250202, 356172, G01B 1126

Patent

active

039663299

ABSTRACT:
An optical assembly defines a reflector or refractor element installed behind the film plane of an optical scanner or fixed beam system. Its function is to image the rear nodal plane of a spot forming lens of the optical beam system, onto a split diode photodetector. The optical assembly is split into at least two facing optical sections with a thin reflective interface formed therebetween, whereby is defined a very precise intersection between the two optical sections at the surface of entrance of the beam. A fixed or scanning spot impinging the precise intersection is divided into two parts, and each is focused and directed to separate diode photodetector means. The relative intensity between the two parts of the divided beam is used to indicate the lateral deviation of the spot position with respect to the intersection. The images formed at the photodetector may be made essentially stationary regardless of the position of a scanning spot as it moves along the line of intersection. The assembly may also be used as a four quadrant system for determining the position of a fixed beam.

REFERENCES:
patent: 3520586 (1970-07-01), Bousky
patent: 3617131 (1971-11-01), Taguchi
patent: 3627428 (1971-12-01), Bergman

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