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INDUCTION HEATING GUN

NASA Case No. LAR-12540-1
Inventor: John D. Buckley, et al.
Canada, Japan, Australia,
West Germany, Switzerland,
Great Britain, France,
Sweden, The Netherlands

Address inquiries to:
Langley Research Center
Attn: Patent Counsel
Mail Code: 279
Langley Station
Hampton, VA 23665
U.S.A.

Corresponding to U.S. Patent No. 4,521,659

Filed 8-24-79
Issued 6-4-85

A device for inductively heating and fusing thermoplastics comprising an alternating current passing through a tank circuit, the inductor member of the tank circuit being wrapped around a curved pole piece of a ferromagnetic material. The magnetic flux of the inductor coil member flows to the ends of the pole piece and into a screen placed between the matrials to be joined. The flux induces a current in the screen, and heat is generated to melt the thermoplastics together. Because only 30-150 watts of power are passed through the tank circuit, a wire which will remain cool under operational wattage may be selected, making air or fluid cooling unnecessary.

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An improved slow wave circuit especially useful in backward wave oscillators includes a slow wave circuit (10) in a waveguide (12). The slow wave circuit is comprised of rings 11 disposed between and attached to respective stubs (13, 14). The stubs (13, 14) are attached to opposing sidewalls of the waveguide (12).

To the end that opposed, interacting magnetic fields will be established to provide a very high coupling impedance for the slow wave structure, axially orientated bars (20) are connected between rings in alternate spaces and adjacent to the attachment points of stubs 13. Similarly, axial bars (21) are connected between rings in the spaces which do not include bars (20) and at points adjacent to the attachments of bars (21).

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A linear magnetic bearing is provided which has an elongated housing for containing a shaft type armature with quadrature positioned shaft position sensors and equidistantly positioned electromagnets located at each end of the housing. Each set of sensors is responsive to orthogonal displacement of the armature and is utilized to generate control signals to energize the electromagnets to center the armature. A bumper magnet assembly is located at one end of the housing for dampening any undesired axial movement of the armature.

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LOW INTENSITY X-RAY AND GAMMA-RAY IMAGING

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A low intensity X-ray and gamma-ray spectrometer 10 is disclosed for imaging, counting, and energy resolving of single invisible radiation particles. Spectrometer 10 includes a converting device 20 for converting single invisible radiation particles to visible light photins. Another converting device 24 converts the visible light photons to photoelectrons. A fiber optics coupling device 22 couples together converting devices 20 and 24. An intensifying device 26 intensifies the photoelectrons by an average gain factor of substantially 104-107. Intensifying device 26 is an anti-ion feedback michrochannel plate amplifier which is operated substantially below saturation. A displaying device 32 displays the intensified photoelectrons. Displaying device 32 indicates the spatial position, number, and energy of the incoming single invisible radiation particles.

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A surface of an article adapted for relative motion with a fluid environment is finished by coating the surface with a fluid adhesive, covering the adhesive with a sheet of flexible film material under tension, and setting the adhesive while maintaining tension on the film material whereby the tensioned film material is bonded to the surface by the adhesive.

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*Japanese manufacturing rights exclusively licensed to Japan

Engineering Development Company. See page 23 for address. All other foreign patent rights available from NASA.

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