Dynatech Electro-optics Corporation

Larry J Schoennauer

Matthew A White

Jacob Y Wong

Ross E Johnson

Keith Kaste

Ronald B Alers

Stephen D Morrow

Douglas Ridgway

Peter Smidth

Brian Gleason

Apparatus for inserting and removing several filters from an optical path and for determining at all times the instantaneous positional relationship of each filter with respect to the optical path includes a set of filters mounted on a carrier which is attached to a resonant piezoelectric system, and further includes reference tracks also located on the carrier and extending in the direction of the oscillatory motion and including a sequence of binary indicia progressing in the direction of the oscillatory motion. The reference tracks are read optically to produce a series of binary electrical signals which are processed to yield the instantaneous position of the carrier and filters with respect to a fixed optical path.

Resonant piezoelectric chopper for infrared radiation

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San Luis Obispo, CA, United States of America

Larry J Schoennauer