Abstract: A mechanical oscillator of the type which includes a mechanical resonator and a resonator driver connected in a regenerative signal loop in which the driver receives the resonant frequency signal of the resonator and provides, in response thereto, a constant magnitude drive signal of equal frequency and supporting phase to the resonator to maintain a minimum amplitude for the resonant frequency signal, is provided with dual resonator drivers actively connected in parallel in the regenerative loop, each providing through a load sharing network a proportionate amount of the total drive signal magnitude in complement with that provided by the other, and each providing the full drive signal magnitude in the presence of a failure of the other.

Abstract: An improved SAW pressure sensor structure includes a dual substrate sensor having a SAW substrate with a SAW delay line disposed in an active signal region on a first one of two parallel major surfaces thereof, and having a centrally apertured base substrate of the same material bonded at a mating surface thereof to the second one of the SAW substrate major surfaces with a glass seal, the dual substrates being bonded in crystallographic orientation, the central aperture having segmented portions to provide a major diameter opening at the mating surface coextensive with the active signal region to form a diaphragm and having a minor diameter opening at a second surface of the base substrate at a value less than one half that of the major diameter, the base substrate further including an O-ring groove adapted to receive one end of a cylindrical metal sleeve in a vacuum sealing relationship, the metal sleeve having a diameter equal to one half that of the aperture major diameter, the sleeve being bonded at anoth

Abstract: Apparatus is provided for controlling, during unoccupied periods, the operation of an HVAC system and perimeter heating system providing hot air and hot fluid, respectively, to a temperature controlled living space having occupied and unoccupied periods, the apparatus including an electronic processing means in combination with dedicated sensing apparatus, the apparatus providing controlled actuation of the HVAC and permieter heating system in dependence on the temperature difference between an actual space temperature signal and unoccupied space heat and cool reference temperature signals, the apparatus further providing an optimum start-up procedure including simultaneous actuation of the HVAC and perimeter heating system to accelerate the heating of the space, the HVAC discharge temperature being modulated during the start-up procedure in dependence on the temperature difference between the actual space temperature and an occupied space heat reference temperature signal, the perimeter heating system discha

Abstract: A surface acoustic wave (SAW) device having a substrate of desired material is vacuum encapsulated in a structure fabricated from the same material as that comprising the substrate.

Abstract: A central control system includes a central processing unit (CPU) installed in a central location of a facility, and interconnected with a plurality of remote controllers, each located in an associated one of several buildings in the facility and each including a remote microprocessor (RMP), the CPU automatically controlling, simultaneously from the central location, the closed loop operation of individual environmental conditioning systems in the several buildings comprising the facility in combination with the RMP associated therewith and in dependence on the sensed temperature conditions within the living spaces associated with each system.

Abstract: A broadband microwave waveguide modulator uses microwave signal frequencies to provide phase modulation of an infrared laser propagating in a guided mode through a common electrooptic interaction region in the form of a microstrip transmission line, provided by electroplating microwave electrodes on each of two mutually opposed major surfaces of a monolithic, thin-film optical waveguide having uniform thickness, to provide a high efficiency conversion of a portion of the laser carrier power into optical sideband signals.

Abstract: A strain gauge force transducer having a mounting surface and a bearing surface and responsive to compressive loading therebetween is attached at the mounting surface to the sole of a slipper which is adapted to releasably engage the foot of a human operator, the transducer being attached at a force transmitting portion of the sole which receives the force applied by the operator, the bearing surface of the transducer being adapted for contact with the brake pedal of an automobile, the transducer providing, in response to compressive loading resulting from the transmittal of operator-applied force from the sole to the brake pedal, a signal at a magnitude representative of the force applied by the operator to the brake pedal.

Abstract: Electronic processing means, in combination with dedicated sensing apparatus is used to control the operation of an HVAC system which regulates the temperature in one or more temperature controlled spaces. The electronic processing means and associated sensing apparatus being readily adapted to existing HVAC systems through interface apparatus installed in each of the existing HVAC control lines associated with the HVAC sources of mixed air, hot air, and cold air, to provide selective actuation and modulation of the discharge air temperature from each source, individually or in combination, in response to sensed HVAC parameters including source discharge temperatures, space temperatures, outside air temperature, and the relative humidity of the outside air and return air from the spaces.

Abstract: All harmonics of an order less than (6.multidot.N-1) are cancelled from the fundamental signal presented in each output phase of a three-phase converter as the sum of corresponding phase angle fundamental signals from an N number of converter bridges, where N is a non-power of two.

Abstract: Apparatus for controlling the discharge temperature of thermal fluid presented from a common thermal source to one or more HVAC systems in a network, each HVAC controlling the volume of thermal fluid circulating therethrough by regulating the valve position of HVAC valve apparatus over a valve position range from a full closed position to a full open position in dependence on the thermal energy level required by one or more temperature regulated living spaces associated with each HVAC, the apparatus including electronic processing means in combination with dedicated temperature and valve position sensing apparatus for providing actual position signals for each fluid valve apparatus and an actual source discharge temperature signal, the electronic processing means determining the magnitude of the greatest thermal energy demand within a short term interval in dependence on the most open of the actual valve position signals and providing modulation of the source discharge temperature over the short term interval

Abstract: A plurality of different monolithic, three-dimensional thin-film infared waveguide structures having high optical power handling capability, low optical propagating loss, long propagation and interaction length and distortion-free characteristics are fabricated through high precision mechanical, chemo-mechanical, and ion-beam thinning of a bulk crystal wafer.

Abstract: A plurality of different configuration, monolithic, three-dimensional thin-film infrared waveguide structures having high optical power handling capability, low optical propagating loss, long propagation and interaction length and distortion-free characteristics are disclosed, each having characteristics for use in electrooptic and acousto-optic applications.

Abstract: A color cathode ray tube (CRT) provides excitation of a plurality of noncontiguous picture elements disposed substantially in a matrix configuration of rows and columns on the inside surface of a video screen formation included within the tube, with a hollow electron beam provided by a modulatable, hollow beam electron gun assembly within the tube, each picture element including a plurality of different color phosphors deposited in a determined concentric geometric pattern, the screen formation further including a high work function dielectric material disposed interposingly with the picture elements of the matrix configuration for providing a negative electrostatic field gradient in a direction opposite to that of the incident hollow electron beam horizontally deflected across the screen by a deflection circuit, to cause registration of the beam with each successive picture element and to cause, in combination with the deflection circuit, the beam to step from the center of one picture element to the center

Abstract: A modulatable, hollow beam electron gun assembly includes an electron-optical (E-O) column having a fixed diameter ring, dispenser type cathode assembly for providing a hollow electron beam through thermionic emission from a hollow cylindrical cathode element, first and second control grid assemblies, a first anode assembly and a second anode assembly, which in combination with a beam modulator assembly comprises an electrostatic coaxial lens assembly. The grid and anode assemblies provide control of the emitted beam current density.

Abstract: An electro-optical switching system includes a plurality of visually activated switches, one for each one of a plurality of different electronic apparatus, each including electromagnetic radiation sensors having a detection surface and each controlling the application of electrical power to the respective equipment in response to an impinging electromagnetic beam incident at the detection surface for a determined time interval. A pulsed electromagnetic beam is provided by a transmitter included within an electromagnetic activating source held, or disposed on a portion of the anatomy of, a human operator who aligns the beam with the detection surface on the selected one of the switches with the aid of a visual reticle image provided by a reticle generator included in the activating source and boresighted with the transmitter.

Abstract: A mode-locked surface acoustic wave oscillator (MLSO) provides mode-locked, phase coherent RF signal pulses through a regenerative closed loop RF signal path which includes a surface acoustic wave (SAW) delay line having a piezoelectric substrate and a pair of signal transducers relatively disposed at a determined SAW propagation distance along a major surface thereof, an RF amplifier to provide in phase amplification of the RF pulse, and a signal expander circuit for providing an increase in the harmonic frequencies of the RF signal pulse and an increased RF pulse frequency bandwidth. The pulse repetition frequency is determined by the signal propagation time delay, provided primarily by the SAW delay line. The delay line transducers establish the center frequency of the RF signal pulse and the bandwidth of the regenerative loop limits the minimum obtainable RF pulse width.

Abstract: A surface acoustic wave (SAW) tapped delay line, including a piezoelectric substrate having a pair of signal launching transducers disposed thereon for providing surface acoustic waves in the substrate in response to electrical signals applied thereto, and including a plurality of transducer taps disposed in an interaction region of the substrate for providing a plurality of sensed electrical signals in response to the surface acoustic waves propagating through the interaction region, the plurality of sensed electrical signals including signals at the frequency of each of the acoustic waves, is combined with a plurality of nonlinear frequency mixers, each responsive to a corresponding one of the transducer taps, and each providing signal manifestations of the sum and difference frequency of the surface acoustic waves in a selected one of two phases which are displaced by 180.degree.

Abstract: An improved high security locking apparatus is provided by combining an electromagnetic locking apparatus of the type which includes a lock portion and a removable key portion, the key portion providing a determined unlocking combination signal, the lock portion providing an immediate unlocking function in response to the presentation of the determined unlocking combination signal from the key portion while placed within a determined surface location of the lock portion, with an interlocked time delay circuit which provides silent, time delayed activation of the unlocking function in response to the simultaneous presence of the determined unlocking combination signal with the placement of the key portion within the determined surface location, and which inhibits the unlocking function for all other conditions.

Abstract: The unregulated AC electrical power provided by an engine driven alternator to an airborne electronic engine control system which controls the performance of a gas turbine engine, is rectified to provide unregulated DC voltage signals for system electrical power. The system provides position control of a plurality of controlled surfaces within the engine through a plurality of digital effector servo actuators, each of which includes a mechanical assembly for providing displacement of the surface in each of two directions in response to a magnetic field provided by a respective one of two oppositely polarized solenoids disposed within the actuator.

Abstract: In a combustion engine, such as a diesel engine, the periodic displacement of an engine component member having a cyclic function directly related to the piston stroke of an engine cylinder, is detected by a proximity sensor disposed adjacent to an area through which the component member is periodically displaced, the sensor providing a series of cylinder identification (CID) signal pulses having a peak amplitude in dependence on the spatial distance between the sensor and the member at that position in its displacement cycle at which it is in close proximity to the sensor, and having a period in dependence on the periodicity of the member displacement cycle, the occurrence of each CID signal pulse being directly related to, and representative of the piston stroke through a reference piston position.