North American Philips Corporation

The Pennsylvania Research Corporation

Dragan Damjanovic

Leslie E Cross

Sei-Joo Jang

Amar S Bhalla

Frank Ainger

Kiyoshi Takeuchi

An infrared imaging system is described which includes a pyro-optic sensor for receiving a thermal image on one of its sides, the sensor exhibiting a substantial change in refractive index in responses to changes in its temperature. A light beam is projected onto a second side of the sensor, the beam being selectively, locally reflected by the sensor in accordance with local changes in its refractive index. A receiver detects the reflected beam and responds to the reflectance changes to derive a visible image of the thermal image. The pyro-optic sensor comprises a sandwich structure which includes a film of energy absorbant material upon which the thermal image is received; a thin film of thermal-optic material; and a supporting layer which includes an optically transparent foam positioned next to the pyro-optic material on the side at which is directed an interrogating light beam.

Pyro-optic detector and imager

An improved lead calcium titanate piezoelectric sintered body is produced by sintering in air at 1000.degree. C.-1200.degree. C. a calcined mixture of oxides or oxide compounds in amounts adapted to form a composition of the formula Pb.sub.1-x Ca.sub.x Ti.sub.1-y (Co.sub.1/2 W.sub.1/2).sub.y O.sub.3 +0.005-0.02(A) where A is at least one of MnO, MnO.sub.2, NiO and Nb.sub.2 O.sub.3, wherein x=0.3-0.4 and 0.04&lt;y.ltoreq.0.06.

Lead calcium titanate piezoelectric ceramic element

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State College, PA, United States of America

Dragan Damjanovic