Abstract: An electroacoustic transducer ring has an inner vibratile surface defining a ring cavity with a plurality of arcuately spaced electrodes affixed thereto. Planar partitions are placed in the ring cavity. The partition edges are parallel to the ring axis and are attached by a resilient strip to the ring inner surface in the arcuate spacing between the electrodes. The partitions have substantially continuous radial surfaces and when the partitions are substantially coextensive in the axial direciton with the ring axis optimal chordal and diametral isolation between the electrodes is provided.

Abstract: Omnidirectional sonic transducers suitable for underwater operation as either hydrophones (listening devices) or projectors (sonic sources) are disclosed. The transducing device has a hollow resonant cavity with at least one flexural disk mounted therein in acoustic communication with both the interior and exterior of the cavity. The cavity also has at least one aperture providing acoustic coupling between the cavity interior and exterior, and a pliant lining covering substantially the entire cavity inner surface except for flexural disk surfaces and the aperture to detune the natural cavity resonance by reducing the rigidity of the cavity inner surface, thereby improving the overall frequency response characteristics of the transducing device.

Abstract: A sonobuoy has several components slidably mounted in an elongated tube. The components are longitudinally stacked one above the other at the lower end of the tube when the sonobuoy is in a pre-deployed state and are caused to slide longitudinally upwardly in the tube during sonobuoy deployment to provide a predetermined longitudinal spacing between the components when the sonobuoy is deployed. The components typically include an electronics canister, acoustic wave phase controls and one or more active electroacoustic transducers. The components are attached to a plurality of flexible support cables. The cables are attached at their respective upper ends to the bottom of the canister and are attached at their lower ends to the bottom of the tube. The cables are collapsed during the pre-deployed state and tautly extended during the deployed state. Axial guide strips are affixed to the inner surface of the tube.

Abstract: A stereoscopic infrared imager includes optics for producing infrared images of two different views of an infrared scene. A scanning mirror alternately scans the two infrared images across a single infrared detector array. The detector array modulates a light source array to produce a visible image of the scanned part of the infrared scene. Optics are provided for producing visible images of the light source array at the positions of the eyes of the observer. A second scanning mirror alternately scans the image of the light source array across the two eyes of the observer in order to construct full visible images of the scene.

Abstract: An energy management controller is coupled via a clock line pair, a "data out" line pair and a "data in" line pair, to a plurality or group of stations each having energy using equipment. Each station is electrically coupled to each line pair at spaced points along the line pairs. Each station counts the number of clock bits from the controller. After each group of a predetermined number of clock bits are received, each station provides an address count that is incremented by one after each group of clock bits are received. By setting each station to a different address count and enabling each station to transmit and receive data only during its respective address count period each station can be individually accessed by the controller without specifically addressing each station. During the address count period for each station serial bits are transmitted to and received from that station by the controller for actuation and control of the energy using equipment for that station.

Abstract: A carrier frequency is frequency modulated with a triangular wave and transmitted from a sensor to a target having relative motion to the sensor. The reflection from the target is received and mixed with a portion of the transmitted signal. At least two harmonics of the modulating frequency are filtered from the output of the mixer. Each harmonic is synchronously detected with an harmonic of the same frequency to obtain a doppler signal that is detected and fed to a comparator. Each harmonic, and its corresponding doppler envelope, amplitude peaks at a respective range to the target. When the doppler of one harmonic exceeds the doppler of another harmonic in amplitude, a predetermined range to the target is signaled by the comparator.

Abstract: Sonobuoy parachute shroud line ends are retained by a cup mounted in and adjacent one end of the sonobuoy outer casing. A heavy ejection spring is beneath the cup for forcibly ejecting the cup outwardly from the one end of the casing. The cup is retained in the casing against the spring force by a pair of partially overlapping elongated plates each having one end releasably inserted in a circumferential slot in the outer casing, the slots being adjacent the casing one end and diametrically opposed. The upper plate is in retentive contact near the other of its ends by a first retainer rod pivoted at one of its ends to the cup bottom surface. The first rod contacts the upper plate near the pivoted rod end and is in retentive contact near its other end with a second retainer rod pivoted at one of its ends to the cup bottom surface. The second rod contacts near its pivoted end the first rod and is in retentive contact at its other end with a one shot spring motor driven pin.

Abstract: A focus-corrected convergent beam scanner includes a lens arranged to receive light from a scene and to form an image of the scene in an image plane. A mirror annulus is arranged behind the lens to reflect light from the scene which is passed through the lens. A detector is arranged to receive light from the scene which has been reflected by the mirror annulus. The mirror annulus is rotatable about an axis of rotation in order to scan the image of the scene across the detector. The tilt angle of the reflecting surface of the mirror annulus varies as a function of the position of the reflecting surface along the circumferential axis of the mirror annulus. The circumferential axis is arranged at a varying distance from the lens such that the image plane of the scene is always reflected onto the detector.

Abstract: A three winding induction compass mounted in a host vehicle has each winding output coupled to an analog to digital converter. Each winding output is weighted and accumulated by a push down stack circuit to obtain a time filtered output and the maximum and minimum values of each filtered output are determined and stored as the vehicle is turned in a 360.degree. circle. The distortions due to the permanent and induced magnetism of the host vehicle and due to winding imbalance between the three windings and misorientation of the three windings are obtained from the maximum and minimum values to obtain calibration parameters. The calibration parameters for the windings are applied to the outputs of the three windings to obtain an equivalent two winding output which is normalized for determining the corrected compass heading.

Abstract: The output of a deflection operational amplifier is coupled through a dissipation circuit to a deflection yoke coil of a stroke written cathode ray tube for deflecting an electron beam on the tube screen. A feedback circuit is coupled between the coil and the inverting input of the amplifier to control the current through the coil. The dissipation circuit comprises a dissipative resistor, such as an incandescent lamp, and a shunt connected bypass capacitor. The dissipation circuit dissipates power during coil steady current conditions such as exist during slow movement or hold of the electron beam on the screen when voltage across the coil is low but coil current may be high. Thus the power otherwise dissipated in the amplifier output transistors is dissipated in the dissipation circuit. The bypass capacitor passes high frequency deflection signals to the coil during coil high instantaneous current conditions corresponding to fast movement or slewing of the electron beam on the tube screen.

Abstract: Coaxial cables each having a cylindrical electrically conductive outer shield and a central conductive wire insulated from the shield are conductively coupled through a connector to coplanar conductors on a dielectric substrate. The conductors converge toward an opening in the substrate. The coplanar conductors alternately are ground and signal conductors. Each coaxial cable shield is conductively coupled to two ground conductors and the cable wire is conductively coupled to the signal conductor between the two ground conductors. At the substrate opening the ground and signal conductors are conductively coupled to planar stripline waveguide ground and signal blades, respectively. Ground blades between the signal blades are a factor in controlling the signal blade impedance and provide isolation between the signal blades. Each blade is perpendicular to the substrate and has a pitch angle such that the blade extends through the opening below the substrate.

Abstract: A sonobuoy float canister is releasably latched to a wound cable pack container. The cable is attached at its upper end to the canister and at its lower end to a lower sonobuoy component. A rotor latches the canister and container together in one rotative position so that the cable is not unwound or payed out to provide a first or shallow depth deployment of the lower component. In a second rotative position of the rotor the canister and container are unlatched from one another and the cable is positively restrained after a predetermined partial payout to provide a medium depth deployment of the lower component. In a third rotative position of the rotor the positive restraint of cable payout is removed and the canister and container are unlatched so that the cable is fully payed out to provide for full depth deployment of the underwater component.

Abstract: A stacked phased array type of transducer has a single electroacoustic transducer element supported intermediately of an elongated tube having a plurality of ports and an end wall at each end thereof for transmitting and receiving acoustic waves broadside the longitudinal axis of the array tube. The element has a first vibratile surface in direct acoustical communication with the external transmission medium and a second vibratile surface in direct acoustical communication with the tube internal transmission medium. The tube is provided with at least one annular port spaced longitudinally from each end of the element for providing acoustic coupling between the internal and external transmission mediums with the tube interior providing acoustic transmission paths internally of the tube communicating between the second vibratile surface and the external transmission medium at each one of the ports.

Abstract: A circuit for monolithic or film stratum is adapted to have circuit capacitances integrated therein and having a minimum unit capacitance (MUC), or smallest practical capacitance that can be fabricated therein. Circuits are provided that have in one circuit arm a capacitor having a first capacity and in a second circuit arm a number N of series connected switched capacitors having a second or terminal capacity, or effective capacity between the end terminals of the second arm, that is less than the first capacity. The first capacity and second capacity form a ratio R, which is the factor by which the first capacity is greater than the second capacity. Switching is provided for each plate of each of the series connected capacitors and at the end terminals of the second arm to alternately connect the second arm into the circuit and to discharge the series connected capacitors which minimizes the effects of parasitic capacitances.

Abstract: A magnetic sensor for a distributorless ignition system is useable in an internal combustion engine. A Hall-effect device is spaced intermediate a pair of opposing permanent magnets for concurrently generating dual magnetic flux fields within respective air gap regions formed between each of the magnets and the device. Alternatively a magnet is placed between two Hall-effect devices to define the regions. A toothed disk rotatably connected to the crank-shaft of the engine causes different teeth to shunt the fields in each of the regions in a predetermined sequence for generating pulses at the device output indicative of the firing order of the engine. Alternatively, a disk having outer and inner notched rims is used to shunt the fields in each of the regions. Further, an elongated channel shaped member has sides movable in the regions for detecting relative linear motion between two parts.

Abstract: A motor shaft is inserted through the center of a first and second coil spring. A first end of each spring is attached to the motor shaft and the second end is wound against its respective spring force and tied to the motor housing by a respective heat severable cord which is wound about a respective heater element. The first spring places a clockwise torque on the shaft and the second spring places a counterclockwise torque on the shaft. Each heater element may be selectively heated as by flow of electrical current, to heat a selected one element and heat sever its respective cord to release the torque on the second end of a respective one spring to rotate the shaft under the torque of the other spring.

Abstract: A tool rest has a plurality of tool storage locations for tools used at a work station. The tool rest is stationary relative to the work station. An automated robotic arm transports a tool between the tool rest and the work station. The arm movement is programmed to select a particular tool. The tools are releasably retained at their respective storage locations and are automatically released just prior to their transport to the work station, and are retentively held at their respective storage locations after return thereto.

Abstract: A method for encapsulating magnetic particles by enclosure within oil drops, mixing in an aqueous solution and dispersing the oil drops with the enclosed particles by application of an alternating magnetic field. The dispersed and oil covered particles are microencapsulated with at least one type of polymer.

Abstract: An apparatus for encapsulating magnetic particles by enclosure within oil drops, mixing in an aqueous solution and dispersing the oil drops with the enclosed particles by application of an alternating magnetic field. The dispersed and oil covered particles are microencapsulated with at least one type of polymer.

Abstract: To encode an analog to digital signal, a comparator compares an input analog signal with a reconstructed negative feedback analog signal and provides a comparison output digital bit for each comparison. A number of output digital bits is stored in a clocked shift register. A coincidence detector is coupled to the register and provides an output pulse when all the bits in the register are the same. A proportional coincidence integrator proportionally amplifies and integrates the coincidence detector output pulses. A slope polarity switch is coupled to the output of the integrator and to the first bit in the shift register and applies a polarity sign to the integrator output according to the bit value from the register. The output of the switch is integrated to form the reconstructed negative feedback analog signal which is coupled to the comparator for comparison with the input analog signal. The digital output is taken from the shift register first bit.