Abstract: An optical radar is disclosed in which fine vernier range and angular displacement accuracy is achieved by projecting a burst of coherent pulses so as to strobe a target passing through the field of view of the projection apparatus. The use of the pulse burst permits the most recent information to be utilized in obtaining the target track. Prior to projection, the pulses in the burst are sampled. The resulting signal is delayed by an amount corresponding to course range and is directed down one of a pair of oppositely directed delay lines. The signals returned from the target are detected by a sectorized receiver, with an electrical output signal from a detector in one of the sectors being applied to the other delay line in the corresponding pair, such that the signal corresponding to the returned pulse propagates in a direction opposite to that of the sampled signal corresponding to the transmitted pulse.

Abstract: A turret head for use in a graphics plotter for holding a plurality of liquid ink pens adjacent the point of writing and for selectively changing the pens to be the writing pen. Automatic pen tip capping and uncapping is included. A plurality of spaced radial arms are mounted on a turret driven by a stepping motor between main positions. A pen holder assembly is mounted for vertical movement between raised and lowered positions and carries a pen gripping arm thereon. The pen gripping arm is adapted to move vertically between the radial arms of the turret and beneath them as the turret is rotated. The arms are provided with facing releasable gripping fingers for exchanging pens between arms upon contact.

Abstract: An improved wire grid glass tablet for digitizing graphic information which includes a glass plate with a resin layer bonded to one side and having orthogonal grids of wires, made of a ductile material which is stretched beyond the yield point, embedded in the resin layer near the surface thereof to maximize signal-to-noise ratio coupling to the wires.

Abstract: Control is provided to conventional gun-fired projectiles by substituting for the standard fuze thereof a device comprising a canard frame and a main housing, which threads into the fuze well of the projectile, with the canard frame being rotatable with respect to the main housing and having deflectable canards thereon for providing vernier correction on the trajectory to the projectile.

Abstract: A convertible platen for use in a graphics plotter to allow its selective use as either a cut paper plotter or a roll paper plotter. The platen is formed from a specially designed aluminum extrusion and a pair is mounted with one on either side of the drum of a drum plotter between the drum and the supply/takeup rollers. The platens can be raised and held adjacent the drum and spanning the vacuum columns in the plotter to create a table having curved outer edges to support cut paper. They can be released and dropped into the vacuum columns whereby they lie against the outer surfaces and form the upper inner wall with curved upper edges over which paper smoothly is guided between the vacuum columns and the supply/takeup rollers.

Abstract: A heating chamber for supplying heated air in a Brayton engine or gas turbine plant including a compressor and turbine. The heating chamber includes a solar energy receiver that receives solar energy, converts it to heat, and heats air from the compressor. To supply additional energy that may be required for the turbine, fuel is injected into the air stream and a catalyst downstream of the solar receiver reacts the fuel with the air to provide additional energy.

Abstract: A dual-axis magnetometer employs an electromagnet mounted by bender arms within a housing to permit pivotal vibration of the electromagnet with respect to the housing. The electromagnet is driven by an alternating current that causes it to vibrate in the presence of an external magnetic field having a component in a plane perpendicular to the axis of the electromagnet. Output signals are provided at conductors on opposite surfaces of the benders. By observing the relative magnitudes of the output signals and the relationships of their phases with that of the excitation signal, it is possible to determine the direction of that component of the external magnetic field that lies in a plane perpendicular to the electromagnet axis.

Abstract: A primed oscillator for microwave amplification includes a single tank conductor (16) coupled to a coupling conductor (17) by an interdigitated coupler (26). The coupling conductor (17) is connected to the cathode of an IMPATT diode (22) which is triggered by the application of a back-biasing trigger pulse that biases it into its negative-resistance region. When a keying pulse is applied to the IMPATT diode (22), the diode couples power through the interdigitated coupler (26) to the tank circuit (16) to cause oscillations that are initially in phase with any incoming signals, but the frequency of the oscillations is determined by the configuration of the tank circuit (16), not by the frequency of the incoming signal. If the incoming signal is near enough to the resonant frequency, and if the duration of the keying pulses is short enough, the output of the primed oscillator appears to a band-limited receiver to be an amplified version of the input signal.

Abstract: Apparatus for discriminating at a distance between one or more colored symbols displayed on the screen of a television receiver from a plurality of other symbols of different colors includes a colored filter which corresponds to the color of the symbol which is to be discriminated.

Abstract: A method for processing navigation signals received by a LORAN-C receiver to lessen the effects of noise on the navigation data provided to the receiver user. Time of signal arrival information measured by the receiver is modified depending on the signal-to-noise environment to remove extreme time of signal arrival deviations that are obviously erroneous. The modified information is then averaged to more accurately determine the true time of signal arrival and thereby provide more stable and accurate navigation data.

Abstract: This invention is a system that is capable of having a high dynamic range for the transmission of electrical information from an array of sensing devices to processing equipment via transmissions paths. A high gain quadrature multiplexer is coupled to the output of each pair of adjacent sensing devices and a low gain quadrature multiplexer is coupled to the output of each pair of adjacent sensing devices. The foregoing is arranged in such a manner that each sensing device is coupled to one channel of the multiplexer near it and to one channel of the adjacent multiplexer. A quadrature demultiplexer is coupled to the output of the high gain multiplexer and another quadrature demultiplexer is coupled to the output of the low gain multiplexer so that the faint signals received by the sensing devices will be passed to certain processing equipment through high gain channels and the loud signals detected by the sensing devices will be passed to processing equipment via low gain channels.

Abstract: This invention is a transducer support system that couples the weight of the active portion of a transducer to the transducer's flanges without coupling the dynamic motion of the active portion of the transducer to the transducer's flanges. The foregoing invention may be used in a flextensional transducer to produce a transducer with increased acoustic output and lower frequency.

Abstract: Improvements to dispersive delay lines are provided which involve bifurcation to provide for low insertion loss and a non-dispersive/dispersive delay line which allows for non-simultaneous input/output operation, and removes input/output leakage as a limitation to dynamic range.

Abstract: Removal of magnetic coatings from computer memory discs is achieved by immersing the discs in a bath of a sulphuric-acid and glycerine solution while applying an electrical potential between electrodes in the bath, one of which is the disc itself. After removal of the disc from the sulphuric-acid glycerine solution, it is sequentially immersed in alcohol and then water; any remaining coating is next mechanically removed and then the disc is immersed in high purity water and dried.

Abstract: In a projectile including a spinning main housing and a despun canard frame having deflectable canards thereon, a pair of stator windings are disposed within the main housing and a cooperating pair of rotors are arranged within the canard frame. The first stator windings and corresponding rotor generate prime power and permit control of the rotational position of the canard frame while the second stator windings and associated rotor allow control of the deflectable canards.

Abstract: This invention is a small light weight underwater transducer that operates at low frequencies. The foregoing is accomplished by embedding piezoelectric material in the wall of an oval shell between the shell's nodal points. When an alternating voltage is applied to the piezoelectric material, the piezoelectric material expands and contracts causing large circumferential strains in the shell of the transducer. The aforementioned strains cause the shell to vibrate and energy to be radiated into the water. This invention may also be used as a receiving type of transducer.

Abstract: Inflight training apparatus is provided for military aircraft radar warning receivers that is plug compatible with the standard receiver processor to provide realistic training scenarios responsive to pilot maneuvering while recording the pilot's actions for post flight analysis. The training apparatus includes inertial navigation equipment to indicate position and attitude of the training aircraft, a memory in which is stored position and types of enemy radars and threats that would be encountered on an actual combat mission, and a processor which receives inputs from the inertial navigation equipment, memory and radar warning receiver control panel to control the standard receiver video display to generate the training scenario thereon. The training display moves, rotates, and is blanked simulating the effects of aircraft altitude and attitude as the aircraft turns, banks and performs other maneuvers which may be navigational or evasive maneuvers.

Abstract: This invention is a device that permits a flextensional transducer to function after the flextensional transducer experiences a pressure equal to or greater than the pressure found at the survival depth of prior art flextensional transducers. The foregoing is achieved by not bonding at least one end of the transducer's piezoelectric stack to the transducer's shell and having the other end or ends of the piezoelectric stack held in the vicinity of the transducer's shell by a pair of guide rails, etc. This permits the transducer's shell to move away from at least one end of the piezoelectric stack at pressures equal to or greater than the pressure at which the stack would experience tensile stresses in a conventional flextensional design. Thus, the piezoelectric stack will not fracture since it receives no tensile stress.

Abstract: An angular accelerometer comprising a pair of misaligned, spaced apart, cantilevered optical fibers whereby angular accelerations occasion modulation of an optical signal coupled between the two spaced apart, cantilevered-beam optical fibers.

Abstract: This invention is a hydrophone (element) sited beamformer which is coupled to an array cable of a horizontal line array. A hydrophone-sited beamformer is coupled to each hydrophone in the array. The element-sited beamformer directly forms beams from the data detected by the hydrophones by delaying and selecting some of the hydrophone detected data and summing this data with the proper shading value.