Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1990-03-14
1991-01-22
Willis, Davis L.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
356141, H01J 4014
Patent
active
049872931
ABSTRACT:
A digital position monitor is disclosed which is used to output an X and Y position of a laser beam on a quadrant or lateral effect detector. The device includes two high speed microprocessors to perform either a quad cell or lateral effect algorithm in the open loop mode. In the closed loop operation, in addition to the algorithm, a digital filter is also executed. The decision to open or close the tilt loops is made by a central processor or by an external input to the central processor. Each microprocessor is designed to perform either the X or Y function. In brief, the operation is as follows: a detector senses the position error and provides a signal to analog circuits. The output from the analog circuits is applied in parallel to the circuits of the X and Y channels. Both channels comprise an analog-to-digital converter, a microprocessor and a digital-to-analog converter connected in series. Each channel provides an X or Y output. The microprocessor each channel is under the control of a central processor.
REFERENCES:
patent: 3670168 (1972-06-01), Low et al.
patent: 3825845 (1974-07-01), Angelback et al.
patent: 4639586 (1987-01-01), Fender et al.
patent: 4667090 (1987-05-01), Carreras et al.
patent: 4689758 (1987-08-01), Carreras
patent: 4711998 (1987-12-01), Makek
patent: 4749849 (1988-06-01), Hoeberechts et al.
Erlich Jacob N.
Shami K.
Singer Donald J.
The United States of America as represented by the Secretary of
Willis Davis L.
LandOfFree
Digital position monitor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital position monitor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital position monitor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1556121