Abstract: Separate receive and transmit interleaved arrays are distributed throughout a defined area. Each array is interconnected, at opposite ends thereof, to a feed line so that the receive and transmit antennas are each associated with four beams. Feed through connections are employed between receive feed lines and the receive arrays of the antenna thereby permitting the utilization of a microstrip structure.

Abstract: Apparatus is disclosed for retaining an electrically fired getter inside a ring laser gyroscope. A groove is formed in a plate, which is hermetically sealed to a hole in the ring laser gyroscope block. The cylindrically shaped getter is placed longitudinally in the groove such that the getter contacts the groove along only two lines. A mousetrap shaped spring preloads the getter against the groove so as to prevent acceleration forces and vibrations from causing pieces of the getter, heater coil or wire to break loose.

Abstract: A memory access system for a computer is improved by combining look ahead techniques with a partitioned memory. A parallel system operating in reciprocal fashion accesses from one portion while the other portion is generating the next predicted address. The system can also be adapted for use with virtual addressing.

Abstract: Multiple input channels, containing servo angle data, undergo analog multiplexing by a single non-linear ladder and switch network which generates a steering voltage on a channel-by-channel basis. The steering voltage undergoes demodulation and digitization for feedback to the multiplexed non-linear network thereby emulating a Type II servo loop. The digitized angle information is also made available as tracking converter outputs.

Abstract: In a clear viewing screen of the kind comprising a fixed screen element; a disk-like screen element supported for rotation at the outside of the window; a motor for driving the rotatable disk-like screen element supported at the inside of the fixed screen element; the motor to coupled the rotatable disk-like screen element, the motor mounted at the periphery of said rotatable disk-like screen element, and a magnetic coupling having first and second coupling halves is provided, one coupling half coupled to the motor, and the other coupling half coupled to the rotatable disk-like screen element, the coupling members disposed opposite each other on opposite sides of the fixed screen element so that coupling can take place without making a hole in the fixed screen element.

Abstract: A resilient serpentine shaped tungsten wire is formed to match a short wire section to hold a ring laser gyroscope getter. The getter-holder assembly is positioned within a stepped oblong bore so that the getter is in firm contact with the bore surface at two points. This prevents resonances of the getter or holder that might otherwise destroy the getter while subjected to vibrations.

Abstract: A shaft state sensor includes a rotating member having a miniaturized lamp mounted thereto. A rotary transformer is connected to the lamp and supplies it with power. A number of optic fibers are arranged in a circular configuration on a stationary member of the sensor. The center of the circular configuration is coaxial with the shaft of the rotating member. As the shaft turns, the lamp becomes sequentially aligned with each of the fibers thereby indicating changes in shaft position. The fibers are connected to an optical coupler which is in turn connected to an optical density discriminator for detecting when the light passing through a particular optic fiber exceeds the required threshold level. The output from the discriminator is optical and may travel over substantial cable distances to a computer location without the introduction of electrical noise so that shaft position or velocity may be computed.

Abstract: A circuit for duplicating the function of an incremental shaft encoder comprises a rugged resolver connected to a hybrid digital-analog circuit which generates output signals identical to those of a counterpart incremental encoder. The digital portion of the circuit includes terminals whereat absolute angle measurements of a shaft may be made.

Abstract: A monolithic ring laser gyroscope is formed by six mirrors mounted to the respective center of each face in a cube. Bores in the cube interconnect each of the mirrors. Three orthogonal planes are defined within the cube, each of which contains a laser cavity. Accordingly, three orthogonal beam paths exist, each responsive to rotational inputs about three orthogonal axes.

Abstract: Two of the three reflecting mirrors in a ring laser gyroscope are provided with transducers permitting the mirrors to control the ring laser gyroscope laser path. The third mirror is partially reflecting to permit some cavity radiation to exit. The radiation includes winking signal components which are related to laser beam lock-in. By controlling the phase difference between the signal components, minimum lock-in may be achieved.

Abstract: A universal joint hinge assembly for a tuned rotor gyroscope is insensitive to restraint changes due to spin axes accelerations. The hinge assembly is readily trimmable at the gyroscope wheel assembly to permit adjusting of the axial compliance of the gyroscope wheel thereby reducing the rectified torques due to linear acceleration.

Abstract: A braking mechanism for a rotating shaft includes a corrugated wheel keyed to the shaft. A polyurethane pad mounted on a spring-biased plunger contacts the wheel corrugations creating non-permanent mating formations in the pad. Thus, upon contact between the two, the wheel and pad mesh thereby preventing wheel rotation until the pad is withdrawn.

Abstract: A single beam force transducer is provided with integrally affixed isolation springs which are axially compliant and unbalanced in their spring rates so as to induce beam bending due to applied tension and compression. The amount of bending introduced due to applied tension will be of a precise magnitude so as to substantially cancel undesirable non-linear vibration effects.

Abstract: A single beam force transducer has a beam characterized by a thickened central portion and tapered outward portions. The support members of the transducer are thickened and are thus stiffer while the isolator masses are shortened. These critical configuration changes raise the undesirable "tuning fork" resonant frequency of the beam supporting structure far above that of the beam and ensures that the isolating structure behaves as a rigid body.

Abstract: An electromechanically dithered ring laser gyroscope includes a beam combiner utilizing optical fibers instead of conventional optics. This permits a beam measuring photodetector and associated electronics to be positioned outside the gyroscope or its enclosure. The invention further includes a dither compensator using optical fibers thereby replacing sensitive electronic or optical dither compensating components.

Abstract: A torsional hinge is axially mounted within a central bore of a ring laser gyroscope body. The hinge comprises a plurality of angularly spaced wing sections having generally radially extending slits therein for permitting torsional motion of the gyroscope about the hinge. A plurality of spaced arcuate segments bridge a gap between the wing sections and the confronting surface of the bore and are cemented to the surface for securement of the hinge. By properly dimensioning and positioning the subtending contact areas of the hinge within the bore, the effects of thermal expansion of the hinge are minimized thereby inhibiting distortion of the gyroscope body as well as path length changes with temperature.

Abstract: A master clock for a microprogrammed digital computer generates output pulses whose separation in time can be varied in response to each microinstruction or to a process-related signal. The output pulses are formed from basic time units from a clock generator which are combined, in digital logic circuitry, to form a minimum time interval and supplemented, under command, with the necessary additional time units to delay the next output pulse by the required amount of time.

Abstract: A hysteresis synchronous motor in which a rotor includes arcuate permanent magnets mounted adjacent to the hysteresis ring material. Permanent magnetic poles are induced in the ring material by the rotating electromagnetic stator field. After start-up, the rotor remains synchronized with the rotating field due to the mutual attraction of opposite magnetic poles.

Abstract: A feedback control system for maintaining the intensity and spectral distribution of light at a predetermined level at a wavelength characteristic of the excited source. Control of that intensity, which exhibits a systematic but not necessarily a monotonic relation with excitation, is achieved by measuring and controlling the intensity of flux at another characteristic wavelength which is both systematic and monotonic.