USA As Represented by Secretary of the Navy

Lawrence T Kabacoff

Arthur E Clark

John H Barkyoumb

Howard T Savage

Marilyn Wun-Fogle

Bruce Beihoff

Antonio Hernando

William A Ferrando

Kristl B Hathaway

Chak-Pan Wong

David J Land

Christine Modzelewski

A metal or graphite fiber is suspended in a working fluid having a high refractive index change with the temperature and a modulated laser beam heats the fiber producing a synchronous thermal wave in the fiber whose amplitude and phase are measured by passing a probe laser beam through the liquid close to the fiber and converting the probe beam deflections into an electric signal. A theoretical model of the thermal wave is used to calculate the amplitude and phase shift of a theoretical thermal wave for points along the fiber from physical characteristics of the lasers and the fiber including an estimate of the thermal conductivity of the fiber. The straight line slope of the log amplitude or of the phase shift of the theoretical wave versus distance is compare against the straight line slope of the log amplitude or the phase shift versus distance for the electrical signal and the estimated value for the thermal conductivity of the fiber is adjusted until the theoretical slope and the electrical signal slope are the same which means that the thermal conductivity of the fiber has been found.

Method of measuring the thermal conductivity of microscopic graphite

A structural laminate of rigid layers separated by very thin layers of vius fluid. The viscous fluid adheres to the confronting surfaces of adjacent rigid layers and is maintained in layered alignment within the laminate to ordinarily prevent flexural vibration and provide vibration overdampening to cope with flexural deforming forces.

Vibration damping structural laminate

Magnetostrictive wire having a low surface-to-volume ratio established by a onstant non-planar cross-section, is helically deformed into contact with a shaft under a stress maintaining the wire in fixed relation to the shaft surface. Magnetic anisotropy is imparted to the wire by twist thereof about its cross-sectional axis while the wire is being helically deformed into contact with the shaft surface to form a torque sensor through which accurate torque detection is achieved.

Magnetostrictive torque sensor

Method of doping single crystal diamond for electronic devices

A process for bonding two diamond surfaces together by

Method of joining diamond structures

A process for producing a diamond composite comprising diamond powder parles bonded together by polycrystalline diamond by (1) pressing an intimate mixture of fine opaque nondiamond carbon powder and transparent diamond powder to form a green body that is confined in either a thin walled transparent quartz vessel or a polycrystalline diamond coating; (2) using a pulse laser to quickly melt the opaque nondiamond carbon powder, and (3) allowing the carbon melt to cool and grow homoepitaxially from the surfaces of the diamond particles producing a polycrystalline diamond that bonds the diamond particles together.

Consolidation of diamond packed powders

A laser beam conducted through an optical fiber cable is phase modulated communication purposes by a signal encoder operative through a source of current to generate a modulated magnetic field applied to a magnetrostrictive sheathing. The magnetostrictive sheathing is annealed and covers a portion of the fiber cable which undergoes dimensional change to effect modulation.

Laser communication system with wide band magnetrostrictive modulation

Corrosive-resistant, amorphous metal alloy coatings for crystalline metal surfaces wherein the coating is formed by vapor deposition of a mixture of

Corrosion resistant metallic glass coatings

Coating of crystalline metals (Ag, Au, Cu, Al) are formed on amorphous melic alloys (glassy metals) by cathode magnetron sputtering. The process can be used to produce new products such as copper coated amorphous metallic alloy wires for torpedo controls, shielding materials for electromagnetic waves, and anticorrosion coatings for Fe-metalloid magnetostrictive elements.

Metal film coatings on amorphous metallic alloys

The present invention relates to an analog frequency modulatable laser. The radiation of the lasing medium is analog frequency modulated by change of the optical path length by movement of reflective mirrors forming the resonant cavity at the frequency of radiation of the laser in a manner corresponding to an information signal. In one embodiment, a magnetostrictive material is deposited on and bonded to the outer periphery of an active lasing medium having appropriate mirrors on the ends thereof. The magnetostrictive material is exposed to an information encoded magnetic field and physically expands or contracts the physical length of the lasing medium along the optical axis of the lasing medium corresponding to the modulated information of the magnetic field. In another embodiment an optical fiber is secured by cementing or clamping to a transparent end of the active lasing material and one of the optical cavity reflecting mirrors is disposed on the outside end of the optical fiber with the magnetostrictive material being disposed on the optical fiber.

Growing community of inventors

Columbia, MD, United States of America

Lawrence T Kabacoff