Robert E Malm

US Patent:

52685675, Dec 7, 1993

Filed:

Nov 25, 1992

Appl. No.:

7/981507

Inventors:

James O. Bowlby - San Jose CA
Gregory E. Johnston - Redondo Beach CA
Robert E. Malm - Pacific Palisades CA

Assignee:

X-Ray Scanner Corporation - Torrance CA

International Classification:

H01J 4014

US Classification:

2502081

Abstract:

The charge collection control circuit generates a time-varying voltage that is used to control the charge collection process in an MOS photodetector for the purpose of obtaining greater dynamic range. Control is exercised either by means of an integration control electrode that controls the flow of charge from a charge-collecting region to a sink or by means of a transfer electrode that controls the flow of charge from the charge-collecting region to a charge-transport region through which the collected charge flows to an output circuit.

US Patent:

55350046, Jul 9, 1996

Filed:

Mar 3, 1995

Appl. No.:

8/398494

Inventors:

Gregory E. Johnston - San Jose CA
Robert E. Malm - Pacific Palisades CA

International Classification:

G01B 902

US Classification:

356358

Abstract:

The distance-measuring apparatus utilizes an interferometric technique to measure the distance to a light-reflecting surface. A laser-generated plane wave is split by a beam splitter into first and second plane waves. The first plane wave is directed to the reflecting surface which reflects it back to the beam splitter. The second plane wave is directed to a reference mirror which reflects it back to the beam splitter where it combines with the reflected first plane wave to form a combination plane wave. The combination plane wave is caused to vary periodically in amplitude by modulating the position of the reference mirror. Changes in the distance to the reflecting surface are obtained by electronically processing the changes in the power of the combination plane wave.