Abstract: Line patterning apparatus for use with a vector generator comprises a memory storing a plurality of addressable line pattern bit strings. Each string comprises a series of ones and zeros defining a predetermined pattern of dots and/or dashes. Associated with each pattern string is a pattern restart string defining the length of the pattern. The bits of an addressed pattern string and the associated pattern restart string are serially provided by the memory in response to an addressing counter. The bits of the pattern string are utilized for video inhibition to superimpose the pattern on a vector being generated. The bits of the pattern restart string are utilized to clear the counter when a preset restart bit is encountered in the string by the counter.

Abstract: A temperature stable apparatus for mounting an arcuate glass enclosed electrolytic bubble gravity sensor utilizes epoxy cement having a low temperature coefficient of expansion for bonding an end face of a post having a temperature coefficient of expansion equal to that of glass to the center of the glass enclosure of the sensor, and the other end of the post to the center of a rectangular aluminum plate, such that the longitudinal axis of the post is orthogonal to the plate and the plane of the arcuate axis of the enclosure, and such that a chord connecting the ends of the arcuate axis is parallel to the longitudinal axis of the plate.

Abstract: An acoustic sensor with ambient pressure and temperature compensation having a photoelastic element positioned between a diaphragm and a support beam. Thin layers of oil between the photoelastic material and both the diaphragm and support beam prevent surface stress of the photoelastic element due to slowly varying pressures while surface stresses are caused thereon by relatively rapid pressure variations.

Abstract: A viscous dampened sensitive pendulum carries a generally upwardly directed light source for indicating the gravity vertical. The sensitive pendulum is carried for two degrees of pivotal freedom by flexural pivots which are biased for operation at an error free or hysteresis free zero spring rate for small pivotal deflections. A drive pendulum coupled through the flexural pivots to the sensitive pendulum maintains a small pivotal deflection so that error free, zero spring rate, operation is achieved.

Abstract: A pressure and temperature compensated acoustic transducer utilizing a pressure sensitive birefringent element coupled between a flexible diaphragm sealing the transducer and an internal variable rigid diaphragm that forms two internal chambers. Relatively rapid variation in pressure applied to the birefrigent element cause fluctuations in the phase difference between orthogonal components of a polarized light beam traversing the photo-elastic material. Detections of this phase difference variation provides signals representative of incident acoustic signals. Provision for the transfer of liquid filling the chambers permits the equalization between the two chambers of slowly varying internal pressures caused by changes in external ambient pressure and temperature.

Abstract: The radar trigger and pretrigger generator determines the inherent component time delay through the radar modulator and transmitter during a first cycle of operation. During the next cycle of operation a pretrigger pulse is generated after a time corresponding to the previously measured delay and a trigger pulse is generated after a time corresponding to an operator selectable delay. The trigger pulse is used to trigger the radar modulator, which in effect, permits the operator to control the elapsed time between pretrigger pulse and transmitter firing in a fashion which is completely independent of circuit delay variances through the radar modulator and transmitter.

Abstract: A presettable counter and a substantially identical counter both slaved to a crystal-controlled clock oscillator form a programmable slip counter for providing transition signals with a time interval therebetween in accordance with a coarse delay signal preset into the presettable counter. A programmable logic delay line responsive to a fine delay signal delays one of the transitions so as to impart a precise delay interval between the delayed transition signal and the other transition signal.

Abstract: An optical 1.times.N switch uses a polarizing beam splitter cube and a reflector to separate an arbitrarily polarized incident light beam into polarized components which propagate along parallel paths. A polarization rotator is positioned in the path of the reflected component to rotate the plane of polarization of the light beam component propagating therealong to be coplanar with that of the undeviated light beam in the parallel path. The two beams are simultaneously or individually deflected by selectively activating the electrodes of a liquid crystal nematic reflector/transmitter array confined between prismatic bodies to emerge at one or more of a plurality of desired outputs. In a second embodiment, a second polarization rotator and polarizing beam combiner assembly re-establishes the initial polarization and the beams are thereby combined to emerge from one or more selected output terminals as an arbitrarily polarized light beam.

Abstract: A single particle penetration phosphor employs La.sub.2 O.sub.2 S:Tb particles as a core particle having a thin layer of La.sub.2 O.sub.2 SO.sub.4 :Tb formed thereon by oxidation to provide a barrier which must be penetrated by excitation electrons to produce narrow bandwidth green spectral emission from the particle. The thin barrier is in turn coated by a layer of YVO.sub.4 :Eu particles which produce narrow bandwidth red spectral emission upon electron excitation. The barrier layer increases the voltage turn on characteristic of the green carrier host thereby causing the electron irradiated phosphor to radiate in the red spectrum for low voltages and in the green spectrum for higher voltages. Additionally, methods are disclosed for synthesizing the above single particle penetration phosphor.

Abstract: In a cathode ray tube display system of the type utilizing stroke techniques, the display refresh rate is allowed to decrease from a specified maximum in order to ensure that all stroke information is displayed. When the cathode ray tube display system further includes a raster symbol generator, the display refresh rate varies as a function of a fixed raster time interval and a variable stroke time interval.

Abstract: A docking system for positioning a vehicle relative to a selective location employs a baseband communication link between the vehicle and the selected location. Transmitters located at specific points at the selective location are activated upon command from the docking vehicle and synchronized with reference signals radiated therefrom. Time delays between the arrival of each signal radiated by the transmitter and the initiation of a reference signal are determined to establish measures to the different points at the selected location. These measures are then processed to provide relative positioning information.

Abstract: A flat panel display system for use with AC plasma panels in which addressing signals for an AC plasma panel display line is taken from a voltage divider comprised of two photoresistors, a coupling photoresistor and a decoupling photoresistor. Addressing pulses are coupled to the coupling photoresistor and sustaining voltage signals are coupled to the AC line via a capacitor which shunts the decoupling photoresistor. The coupling and decoupling photoresistors are illuminated in turn. The decoupling photoresistors, will upon illumination accelerate the decay of voltages appearing across the coupling photoresistor and on the AC plasma panel display line.

Abstract: A scannable antenna having a radiating array of antenna elements correspondingly coupled, through equal line lengths, to a more closely spaced array of antenna elements positioned in a space coupling region. A feed array of antenna elements, with spacings substantially equal to the spacing in the radiating array and substantially of the same physical size as the more closely spaced array, is positioned in the space coupling region in close proximity, no more than a wave length away, to the more closely spaced array. The feed array is coupled to a distribution network which provides desired phase and amplitude aperture distributions.

Abstract: A hybrid microcircuit package especially for high power microcircuits comprises a hard copper base with integral packaged sidewalls, a sealing frame of Kovar or stainless steel is electron beam welded or laser welded to the top surface of said sidewalls, whereby to highly localize the high temperature at the wall tops and not anneal to the remainder of the copper base. A Kovar or stainless steel lid is conventionally sealed to the frame.

Abstract: In an azimuth determining gyroscope, a mechanically balanced gimbal is suspended from a fixed case by a wire which passes through the generally tubular upper portion of the suspended gimbal. A spin motor and a wheel for rotating about a vertical axis are coupled to the lower portion of the suspended gimbal. The upper portion of the suspended gimbal has pickoff and torquer coils for measuring the position of the suspended gimbal with respect to the fixed case and for providing torque to the suspended gimbal. Leads to the spin motor are configured to act as azimuth restraint means between the suspended gimbal and the fixed case.

Abstract: An inclinometer providing a digital numerical readout includes a level sensor responsive to orientation and means for driving a liquid crystal display to indicate the inclination of a surface with a high degree of precision. Features include high stability with changes in battery voltage and surrounding temperature, a battery condition monitor, freedom from operational adjustments after the initial calibration, and partial blanking of the display to alert a user that the linear inclination limit has been reached. The direct reading digital readout permits ease of operation and a high degree of accuracy and repeatability. Circuitry is especially adapted for low power consumption.

Abstract: A method of fabricating gallium arsenide devices in which contact isolation is provided by a deep mesa step structure. Step coverage of deposited conductive films is facilitated by preferential orientation of the non-centrosymmetric crystal substrate and wet anisotropic etching that provides a sloped step. Problems of fine line definition of the Schottky anode contact in the photolithographic process are addressed by a two-step exposure of a single layer of thick photoresist followed by a chlorobenzene soak prior to development that ensures a retrograde resist profile needed for good lift-off of undesired evaporated metal. Mesas as deep as 7 .mu.m have been obtained, which permit the fabrication of monolithic planar mixer millimeter-wave diodes with low series resistance and reduced parasitic capacitance.

Abstract: An active convergence correction apparatus for a full color cathode ray tube display of the delta gun shadow mask type wherein the horizontal and vertical parabolic waveshape compensation signals are generated by squaring circuits responsive to the horizontal and vertical deflection signals and wherein zero crossing detectors also responsive to the horizontal and vertical deflection signals, which effectively divide the viewing screen into rectangular coordinates, control switches which split each of the horizontal and vertical parabolic waveshape signals in half, whereby the relative amplitudes of each half can be independently controlled to achieve precise convergence in all sectors of the screen.

Abstract: An improved dome antenna system wherein compensation for cross polarized signal components in a received difference pattern of the feed array of the system is accomplished with a second array cross polarized to the feed array. This second array is density tapered to establish an aperture distribution function that is substantially equal to the aperture distribution function of the feed array. Weighting factors, programmed as a function of the boresight scan angle, are applied to the output signals of this second array and the weighted signals are subtracted from the difference signals of the feed array.

Abstract: A damping mechanism for a two-degree-of-freedom rate gyroscope of the flexible disk type includes a pair of auxiliary disks, one mounted closely adjacent each side of the rotor disk to provide squeeze film type damping of any axial vibrations of the rotor at the resonant frequencies of the flexible rotor.