Beam position sensor with time shared normalizing circuit

Details Beam position sensor with time shared normalizing circuit Beam position sensor with time shared normalizing circuit

1989-12-19

1991-01-01

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502033, 2502086, H01J 4014

Patent

active

049820788

ABSTRACT:
A system for detecting position of a light beam propagating along a beam path utilizes a single variable gain preamplifier in a time shared mode for each of the outputs of a four quadrant position sensors. A detector mounted in the beam path and having a reference point, generates a plurality of signals indicating deviation from the reference in plural directions. A multiplexer is connected to the detector, and combines the plural signals into a time multiplexed output. A variable gain preamplifier normalizes the signals in the time multiplexed output to generate the normalized output. The normalized output is then supplied to a logic circuit for processing the normalized output to generate a position signal indicating the position of the light beam.

REFERENCES:
patent: 3579140 (1971-05-01), Anderson et al.
patent: 4626649 (1986-12-01), Dupeyrat et al.
patent: 4703168 (1987-10-01), Olson
patent: 4749849 (1988-06-01), Hoeberechts et al.
patent: 4864651 (1989-09-01), Ogiwara et al.

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