A method for obtaining electronic chroma signals with a single scanning-type image device is described. A color multiplexed light signal is produced using an arrangement of dichroic filter stripes. In the particular system described, a two layer filter is used to color modulate external light which is then detected by an image pickup tube. The resulting time division multiplexed electronic signal from the pickup tube is converted by a decoder into a green color signal, and a single red-blue multiplexed signal, which is demultiplexed to produce red and blue color signals. The three primary color signals can be encoded as standard NTSC color signals. Official Gazette of the U. S. Patent Office. N77-21941* National Aeronautics and Space Administration. Pasadena Office, Calif. UNIFORM VARIABLE LIGHT SOURCE Patent Henry P. Squyres, inventor (to NASA) (JPL) Issued 16 Jan. 1973 7 p Filed 4 Dec. 1970 Sponsored by NASA (NASA-Case-NPO-11429-1; US-Patent-3,711,701; US-Patent-Appl-SN-95189; US-Patent-Class-240-46.13; US-Patent-Class-240-41R; US-Patent-Class-240-41.35R; US-Patent-Class-356-236) Avail: US Patent Office CSCL 20F A uniform stable light source comprising a special lamp with a built in reflector is described. The light projects stable and uniform luminous flux with unvarying spectral characteristics with a distribution temperature of about 3000 K. The uniform luminous flux flows into a conical cavity through an iris diaphragm whose diameter is controllable. A uniform light diffuser is positioned at the opposite end of the conical cavity. The level of luminance which is transmitted through the diffuser is controlled by controlling the diaphragm diameter. Official Gazette of the U.S. Patent Office (NASA-Case-LAR-11782-1; US-Patent-4,012,123; US-Patent-Appl-SN-608482; US-Patent-Class-350-174; US-Patent-Class-350-145) Avail: US Patent Office CSCL 20F An apparatus is described for superimposing numerical information on the field of view of binoculars. The invention has application in the flying of radio-controlled model airplanes, Information such as airspeed and angle of attack are sensed on a model airplane and transmitted back to earth where this information is changed into numerical form. Optical means are attached to the binoculars that a pilot is using to track the model air plane for displaying the numerical information in the field of view of the binoculars. The device includes means for focusing the numerical information at infinity whereby the user of the binoculars can see both the field of view and the numerical information without refocusing his eyes. Official Gazette of the U.S. Patent Office 37 N77-22950* National Aeronautics and Space Administration. Ames Research Center, Moffett Field, Calif. OPTICAL INSTRUMENT EMPLOYING RETICLE HAVING PRESELECTED VISUAL RESPONSE PATTERN FORMED THEREON Patent Richard F. Haines, inventor (to NASA) Issued 19 Apr. 1977 8 p Filed 8 Mar. 1976 (NASA-Case-ARC-10976-1; US-Patent-4,018,533; US-Patent-Appl-SN-665032; US-Patent-Class-356-171) US Patent Office CSCL 20F Avail: An optical instrument for use in locating indicator lights or the like on a work surface is described. It comprises a tubular housing, a lens mounted within the housing and including an inner surface coated with a dichroic material that is capable of reflecting a portion of the light incident thereon, a plate mounted within the housing opposite the lens and having a central aperture, a transparent substrate disposed within the housing intermediate the lens and the plate, the substrate including a first surface disposed in a facing relationship to the dichroic material, and a reticle formed on the first surface and comprised of a material capable of reflecting light. Official Gazette of the U.S. Patent Office 145 Les (NASA-Case-NPO-13722-1; US-Patent-4,018,532: One of the detectors is an illumination detector consisting of two spaced apart elongated strips with a strip of cadmium sulphide (Cds) deposited therebetween. Whenever the line image impinges the CdS strip. the resistance between the two other strips is relatively low, while being high when the line image is outside the field of view of the illumination detector. Also included is a sun angle detector which consists of a vapor deposited resistor strip connected at one end to plus 10v and at the other end to minus 10v. Spaced apart from the resistor strip is an elongated strip of low resistance material acting as an output strip, with a CdS strip between the two strips. When the line image is within the field of view of the sun angle detector, the output voltage at the output strip depends on the position of the line image across the sun angle detector. Official Gazette of the U.S. Patent Office N77-28932* National Aeronautics and Space Administration. Goddard Inst. for Space Studies, New York. METHOD AND APPARATUS FOR PRODUCING AN IMAGE FROM A TRANSPARENT OBJECT Patent Sing H. Lee and Arnold R. Shulman, inventors (to NASA) (Calif. Univ., La Jolla) Issued 12 Jul. 1977 7 p Filed 30 Dec. 1975 (NASA-Case-GSC-11989-1; US-Patent-4,035.062; US-Patent-Appl-SN-645500; US-Patent-Class-350-162SF; The contrast produced from a photographic transparency is controlled by placing the transparency between a pair of partially reflecting mirrors forming walls of an optical cavity. Mirrors trap a collimated laser beam illuminating the transparency so that at least a portion of the beam energy is passed through the transparency plural times. The distance that the light beam travels between the mirrors is controlled as a function of the wavelength of the beam energy to control the phase of light interference in the beam passing through the transparency, thereby controlling the intensity of the beam derived from the mirror downstream of the transparency. Official Gazette of the U.S. Patent Office N77-26942* National Aeronautics and Space Administration. NASA (NASA-Case-GSC-12058-1; US-Patent-4,025,783: US-Patent-Appl-SN-680938; US-Patent-Class-250-199) Avail: US Patent Office CSCL 20F An optical heterodyne receiver comprises a system of reflectors forming a folded Gregorian configuration for collecting a signal beam, and an optical detector located at the focus of the system. A paraboloidal primary reflector and an elipsoidal secondary reflector face each other on an optical axis with the focus of the secondary reflector coinciding with the focus of the primary reflector. An auxiliary laser generates a local oscillator beam that is combined with the signal beam after the signal beam emerges from the exit pupil (which is also the aperture stop) of the system, and the resultant is impinged on the detector. N77-28937*# National Aeronautics and Space Administration. A telescope is described which employs an ellipsoidal primary mirror which receives light from a scene being viewed and reflects it in a hyperbolic secondary mirror. The light is then reflected through a central opening in the primary mirror to a A procedure, using a light beam of predetermined wavelength, preferably monochromatic, for measuring plasma characteristics is presented. Light absorbed by the plasma is used to obtain an absorption coefficient for the plasma. From this known coefficient and independent measurement of either the electron density or temperature of the plasma, an equation may be solved to obtain other unknown quantities. In this procedure, the absorption coefficient of the plasma is derived simultaneously for two probing light beams of substantially different predetermined wavelengths. These two coefficients are used to solve the two equations, which are in turn used to determine plasma electron density and temperature. Official Gazette of the U.S. Patent Office 26 LASER DISPLAY No! N77-30935*# National Aeronautics and Space Administration. Goddard Inst. for Space Studies, New York. PARTIAL POLARIZER FILTER Patent Application Alan M. Title, inventor (to NASA) (LMSC, Sunnyvale, Calif.) Filed 11 Aug. 1977 18 p Sponsored by NASA (NASA-Case-GSC-12225-1; US-Patent-Appl-SN-823566) Avail. NTIS HC A02/MF A01 CSCL 20F A birefringent filter was developed which contains, in seriatum, an entrance polarizer, a first birefringent crystal, a partial polarizer, a second birefringent crystal, and an exit polarizer. The first and second birefringent crystals have fast axes disposed + or - 45 deg from the high transmitivity direction of the partial polarizer. Preferably, the second crystal has a length half that of the first crystal and the high transmitivity direction of the partial polarizer is nine times as great as the low transmitivity direction. To provide tuning, the polarizations of the energy entering the first crystal and leaving the second crystal are varied by either rotating the entrance and exit polarizers, or by sandwiching the entrance and exit polarizers between pairs of half wave plates that are rotated relative to the polarizers. A plurality of the filter modules may be cascaded. NASA ~47-2 PERFECT POLARIZER (NASA-Case-MFS-22145-1; US-Patent-3,854,097; The self-energized plasma compressor is described which compresses plasma discharged from a coaxial plasma generator. The device includes a helically shaped coil which is coaxially aligned with the center axis of the coaxial plasma generator. The plasma generator creates a current through the helical coil which, in turn, generates a time varying magnetic field that creates a force which acts radially upon the plasma. The coaxial plasma generator and helical coil move the plasma under high pressure and temperature to the narrow end of the coil. Positioned adjacent to the narrow end of the coil are beads which are engaged by the plasma to be accelerated to hypervelocities for simulating meteoroids. Official Gazette of the U.S. Patent Office A device for accelerating a projectile to extremely high velocities is described. The device includes a light gas-accelerator to impart an initial high velocity to the projectile and a plasma accelerator and compressor receiving the moving projectile and accelerating it to higher velocities. A capacitor bank is discharged into a plasma generator in timed relationship to the position of the projectile so that the moving plasma drags the projectile along with it. Projectile velocities in the order of 20 kilometers per second, the average meteoroid velocity, can be attained. The accelerator finds particular utility in the field of meteoroid simulation. Official Gazette of the U.S. Patent Office An apparatus for cleaning contaminated surfaces such as hydrocarbon contaminant films in high vacuum environments is described. A plasma discharge housing for allowing a plasma to be generated in an environment having a higher pressure than the surface which is to be cleaned is used. A ground electrode and a radio frequency electrode partially surround a quartz plasma tube, for the introduction of an ionizable gas. These electrodes ionize the gas and help generate the plasma. This plasma flows through a nonconstrictive aperture, through the plasma discharge housing and on to the contaminated surface. NASA N76-17951* National Aeronautics and Space Administration. (NASA-Case-MFS-22145-2; US-Patent-3.929,119; A self-energized plasma compressor which compresses plasma discharged from a coaxial plasma generator is described. The device includes a helically shaped coil which is coaxially aligned with the center axis of the coaxial plasma generator. The plasma generator creates a current through the helical coil which, in turn, generates a time varying magnetic field that creates a force which acts radially upon the plasma. The coaxial plasma generator and helical coil move the plasma under high pressure and temperature to the narrow end of the coil. Positioned adjacent the narrow end of the coil are beads which are engaged by the plasma to be accelerated to hypervelocities for simulating meteoroids. Official Gazette of the U.S. Patent Office 76 SOLID-STATE PHYSICS Includes superconductivity. For related information, see also 33 Electronics and Electrical Engineering and 36 Lasers and Masers. N74-20329* National Aeronautics and Space Administration. Goddard Space Flight Center, Greenbelt, Md. RADIATION HARDENING OF MOS DEVICES BY BORON Patent Vitaly Danchenko, inventor (to NASA) Issued 26 Mar. 1974 4 p Filed 9 Dec. 1971 (NASA-Case-GSC-11425-1; US-Patent-3.799.813; US-Patent-Appl-SN-206266: US-Patent-Class-148-1.5) Avail: US Patent Office CSCL 18F A technique is described for radiation hardening of MOS devices and specifically for stabilizing the gate threshold potential at room temperature of a radiation subjected MOS field-effect device with a semiconductor substrate, an insulating layer of oxide on the substrate, and a gate electrode disposed on the insulating layer. The boron is introduced within a layer of the oxide of about 100 A-300 A thickness immediately adjacent the semiconductor-insulator interface. The concentration of boron in the oxide layer is preferably maintained on the order of 10 to the 18th power atoms/cu cm. The technique serves to reduce and substantially annihilate radiation induced positive gate charge accumulations. Official Gazette of the U.S. Patent Office N75-12810* National Aeronautics and Space Administration. Langley Research Center, Langley Station, Va. DETERMINING PARTICLE DENSITY USING KNOWN MATERIAL HUGENIOT CURVES Patent John D. DiBattista, inventor (to NASA) Issued 22 Oct. 1974 18 p Filed 5 Jun. 1973 (NASA-Case-LAR-1059-1; US-Patent-3,842,656; US-Patent-Appl-SN-367294; US-Patent-Class-73-32R; US-Patent-Class-73-432PS) Avail: US Patent Office CSCL 20H A method is detailed to determine the density of particles wherein the closing velocity is known between the impacting particles and a plate of known material. Either the shock wave velocity or the material velocity produced in the plate upon impact by an unknown material particle is determined and compared with the corresponding shock wave or material velocity that would by produced by different known material particles having the same closing velocity upon impact with the plate. The unknown material particle density is derived by obtaining a coincidence of the shock wave velocity or material velocity conditions initially produced upon impact between the known material plate and one of the different material particles and from the fact that shock wave velocity and material velocity are ordered on the impacting particle material density alone. Official Gazette of the U.S. Patent Office Trap densities in dielectric films are determined by tunnel injection measurements when the film is incorporated in an insulated-gate field effect transistor. Under applied bias to the transistor gate, carriers (electrons or holes) tunnel into traps in the dielectric film. The resulting space charge tends to change channel conductance. By feeding back a signal from the source contact to the gate electrode, channel conductance is held constant, and by recording the gate voltage as a function of time, trap density can be determined as a function of distance from the dielectric-semiconductor interface. The process is repeated with the gate bias voltage at different levels in order to determine the energy distribution of traps as a function of distance from the interface. Official Gazette of the U.S. Patent Office |