Abstract: A dual mode missile seeker system utilizing an infrared transparent radar tenna is disclosed. The infrared transparent radar antenna is mounted in front of and on the same axis as the infrared detector within a missile dome. The radar antenna includes spaced apart patches of infrared transparent semiconductor material and a ground plane of the same material deposited on opposite sides of an infrared and microwave transparent dielectric substrate for transmitting and receiving microwave radiation and for shielding the infrared detector array mounted behind. A radome or separate lens redirects incoming infrared radiation so as to pass through the radar antenna and focus on the infrared detector array.

Abstract: Axial elongation of a magnetostrictive element during a power phase of option in a motor, effects conversion of axial force to a torque applied to a rotor through cam discs held in axial engagement by a clutch disc during axial force transfer. Rotor rotation by such torque angularly displaces the cam discs relative to each other against the bias of a spring device during the power phase, followed by a free-wheeling phase during which axial withdrawal of the clutch disc occurs in response to contraction of the magnetostrictive element and angular restoration of the cam discs to a limit position under the spring bias.

Abstract: Inkless skin printing apparatus and method featuring unique cooperation of common, harmless, odorless solvent in association with ordinary thermal (fax) paper material. The skin area is coated with a substance which includes the solvent and then impressed onto and withdrawn from the thermal paper, thereby visibly forming a developing impression on the thermal paper which eventually fully develops into a quality skin print. Heat application to the developing impression may serve to accelerate and/or enhance the development. Skin prints such as fingerprints are generated according to this invention with "no muss, no fuss, no-clean-up-required" neatness and efficiency, and if desired with on-location portability.

Abstract: An infrared sensitive photodiode which is made of an epitaxial layer of a miconductor alloy which is a lead chalcogenide, a lead-tin chalcogenide, or a lead-cadmium chalcogenide grown on a single crystal substrate of an infrared transparent, electrically insulating material, an Ohmic contact deposited on the epitaxial layer, and a non-Ohmic Pb metal contact deposited on the epitaxial layer to form a Schottky barrier, the improvement comprising the inclusion of halide ions in the interface region between the non-Ohmic lead metal contact and the epitaxial layer of semiconductor material.

Abstract: A junction photodetector employing Pb.sub.1-x Sn.sub.x Te in narrow film strips grown epitaxially on an appropriate substrate. An appropriate metal overlaps the film to form a metal-semiconductor contact.