Abstract: A cladded optical fiber is secured in a slot in a substrate which is ground and polished to access the evanescent field. A thin electro-optically active layer of PLZT is deposited on the top of the fiber substrate. A pair of parallel electrodes is then deposited on top of the crystal PLZT film. An electric field distribution parallel to the electro-optical film is generated at the center of the electrode gap by applying a voltage to the electrode pair so as to effect a phase shift of the light wave propagating in the fiber.

Abstract: A capacitor is charged and discharged through switch selectable resistors from regulated DC voltage supplies and clamping diodes to provide the bias signal to control the rise and fall times of the RF output pulse of a PIN diode attenuator. An isolation buffer isolates charging and discharging transients from the bias signal. An adjustable AC gain and adjustable DC offset inverting amplifier provides the isolation buffered signal to a high impedance, very low output AC impedance source for driving the bias input of the PIN diode attenuator. The DC offset is provided by an adjustable regulated voltage source coupled to the inverting amplifier.

Abstract: A safe and arm device for aligning elements of an energy transfer mechanism of an ammunition fuze includes an inertial mass, an energy transfer mechanism interrupt barrier component and an energy-loadable spring, all movably mounted in a bore of a housing of the device. The inertial mass is movable for producing an arming force in response to application of a predetermined acceleration force to the housing. The bi-stable barrier component is movable from a pre-armed stable safe position to a post-armed stable sterilized position in response to the applying of the arming force to the component upon being released from its stable safe position. In moving to its stable sterilized position, the barrier component moves through an armed position in which the elements of the energy transfer mechanism are aligned in firing relation with one another during a momentary period of time.

Abstract: A tool set for gauging and repairing concentricity of a workpiece bore axial section with the pitch diameter of the internal threads in the bore includes a gauge sleeve, a gauge rod, a reamer, and a stop collar. For gauging concentricity of the internal threads with the axial section, the sleeve is first inserted within the bore and threaded into a concentric relationship with the bore internal threads, and, then, the rod is inserted through the sleeve. The rod has an inner end which can extend from the sleeve and within the bore axial section such that the rod inner end will extend through a predetermined distance if the axial section of the bore is concentric with the sleeve and thus with the pitch diameter of the internal threads within the bore.

Abstract: A removable end plug for closing off the open end of a hollow vehicle bumper. The end plug comprises a molded unitary body of flexible deformable material having four side sections in the form of a hollow square and a four sided truncated pyramid shaped operator portion connected to one transverse edge of the side sections. The operator portion has a normal position whereat the truncated pyramid extends longitudinally away from the bumper opening and a reverse truncated pyramid position to cause said side sections to be bowed transversely outwardly and thereby substantially increase the force of engagement between the outer surfaces of said side sections and the four inside surfaces of the bumper to thereby lock the plug to the bumper.

Abstract: A double acting simplex plunger pump comprising six unitary extruded members, i.e., a crankcase body, a manifold connected thereto and, at each end of the body a stuffing box member abutted on one face to the body and, on the opposite face, to a head member. The pump also comprises a double ended plunger supported by the body for reciprocation of the ends thereof into pump recesses of the stuffing box members.

Abstract: An apparatus for electronically narrowing the beam width of interrogation transmissions of an interrogator utilizes three beams of the four beam system not used as the main beam for the transmission of suppression pulses. One side of the main beam is suppressed by the first sidelobe suppression pulse of the interrogation pulse sequence and then the other side of the main beam is suppressed by the second sidelobe suppression pulse within the interrogation pulse sequence. In another mode of operation, the interrogation beam width is controlled by transmitting a suppression pulse on a beam positioned 180.degree. from the main beam. This electronic narrowing of the interrogation beam width reduces the number of overlapping replies received by the interrogator and enables the interrogator to properly sort out and not lose or misinterpret replies received by proximity transponder equipped aircraft.

Abstract: A detector for detecting a communication pulse in the presence of noise is disclosed having a transmitter for transmitting a communication pulse of carrier frequency having a main pulse portion and a pre-pulse portion, the pre-pulse portion being of substantially opposite phase to the main pulse portion, a receiver for receiving the communication pulse, a correlation signal circuit connected to the receiver for providing a correlation signal, the correlation signal having first and second slopes in response to the communication pulse, the second slope being steeper than the first slope, and a comparator connected to the correlation signal circuit for providing a pulse detection output signal when the correlation signal reaches a predetermined threshold, the threshold being set at level to detect the correlation signal at a point on the second slope.

Abstract: A variable attenuator includes a plurality of circuit cells, each containing a variable resistance shunt element, cascaded to form an artificial transmission line with distributed loss represented by the variable resistance shunt element. Parameters of the transmission line are chosen in a manner to establish a characteristic impedance that is substantially independent of the shunt resistance value and to provide low insertion reflection coefficients for all attenuation values.

Abstract: This invention comprises a puller sabot characterized by a forward stabilizing disk, a rear stabilizing disk and a mid section. The obturator is located on the forward stabilizing disk. The rear stabilizing disk has a plurality of openings extending longitudinally through the rear stabilizing disk such that propellant may be located forward of the rear disk and ignited and vented. The sabot surrounds the peripheral mid section of a long rod fin stabilized projectile and guides the sub-projectile through a rifled barrel.

Abstract: A reserve activated electrochemical cell with a cell condition checking apparatus uses a sealed electrolyte storage reservoir having an expandable pressurized capsule within the reservoir for pressurizing the electrolyte. The reservoir is provided with a rupturable diaphragm providing a fluid-tight seal across an opening in a wall of the electrolyte reservoir. The reservoir is formed integrally with a container for a reserve cell electrode assembly or stack with the wall therebetween containing the rupturable diaphragm. A selectively operable lance is arranged with a pointed first end adjacent to the diaphragm and a second or opposite end projecting out of the cell stack container. A resilient bellows is attached externally of the cell stack container to cover the projecting end of the lance while providing a fluid-tight seal to the external wall of the cell stack container.

Abstract: A multi-aperture, non-imaging sensing system is disclosed, for guiding a moving projectile toward a source of infrared energy. The detectors are arranged peripherally about a forward portion of the projectile, with their individual fields of view overlapping one another to selectively separate a composite field of view into a plurality of separate sectors, with a central sector including all individual fields of view. Infrared sensing elements and electrical circuitry are operatively associated with the detectors, for generating a binary one or zero, depending upon whether an infrared energy source is sensed by the associated detector. The combined results are generated as a digital word, utilized to indicate the location of the source within the composite field of view, and to generate a control signal. The control signal adjusts the projectile orientation to locate and maintain the source within the central sector of the composite field of view.

Abstract: A recovery apparatus for a training torpedo built to replicate an operational torpedo. The training torpedo is an elongated hollow housing substantially similar in shape to an operational torpedo. The nose portion is a shell having a forward and aft portion, the forward portion being a cylindrical cavity extending longitudinally into the shell. A cylindrically shaped piston is adapted to be inserted into cylindrical cavity of the shell. The piston has a forward and a rear portion, the forward portion being a pressure receiving surface. The piston is able to move forward and aft with respect to the shell. Attached to the piston is a retaining means. When a pressure is imposed upon the forward portion of the piston the piston moves aft and the retaining means releases a plurality of weights. Located between the piston and the shell is a damping means. The damping means acts as a counter force to the pressure on the pressure receiving surface of the piston.

Abstract: A reserve activated electrochemical cell has a sealed electrochemical fluid, e.g., an electrolyte, storage reservoir having an expandable free-floating capsule within the reservoir for selectively pressurizing the fluid. The reservoir is provided with a rupturable diaphragm arranged as a fluid-tight seal across an opening defining a fluid conduit through a wall of the reservoir. The reservoir is formed integrally with a container for a cell electrode assembly or stack, e.g., opposite polarity battery electrodes, with a wall therebetween containing the rupturable diaphragm. A selectively operable gas generator within the reservoir is connected to one end of the expandable capsule for providing a gas pressure therein to expand the capsule. The gas generator is operated by a signal applied to the gas generator by electrical connecting leads passing through fluid-tight seals in a wall of the reservoir.

Abstract: Fault detection apparatus for segmented digital displays of a capacitive nature. Current probes interposed between the segment drivers and the segments detect the current pulses required by the on and off segments resulting from the square wave energization applied thereto. Discrepancies between the current pulses and the commanded data provide segment fault status. A serial bus transmits the display data from a Control Unit to the display and transmits the Segment Status Data from the display to the Control Unit. The current pulses are sampled pursuant to a pulse mode or square wave mode of operation.

Abstract: A reserve activated electrochemical cell with a cell condition checking apparatus uses a sealed electrochemical fluid, e.g., an electrolyte, storing reservoir having an expandable pressurized capsule within the reservoir for pressurizing the fluid. The reservoir is provided with a rupturable diaphragm arranged as a fluid-tight seal across an opening in a wall of the reservoir. A selectively operable lance is arranged with a pointed end adjacent to the diaphragm for activating the cell by piercing the diaphragm to release the fluid into the electrode assembly. A reservoir leak indicator is located in the reservoir to provide an indication of a leakage path between the pressurized capsule and the fluid stored in the reservoir allowing a migration of the fluid into the capsule. In a first embodiment of the reservoir leak detector, a visual indication of fluid leakage is provided through a transparent window in a wall of the reservoir by a visual change in a fluid reactive substance located in the capsule.

Abstract: The electric motor contemplated by this invention includes an armature having two opposed faces mounted on a shaft. The armature is mounted on the shaft intermediate of the ends of the shaft. A pair of commutators are mounted on the shaft adjacent to each of the opposed armature faces. Each of the commutators includes a plurality of commutator bars, each of which has its circumferential width offset relative to the circumferential width of the commutator bars on the other commutator. Alternately or in combinatrion, with the commutator bar offset the brushes in operative engagement with each of the commutators are arranged with their circumferential width offset, relative to the circumferential width of the brushes in operative engagement with the opposite commutator. The electric motor can also be provided with a redundancy capability by a circuit arrangement in which one of the commutators is held as a backup in the event of a failure of the windings of the other commutator.

Abstract: A symbol generator useful for stroke based and raster display systems provides the ability of generating ellipses and elliptical arc segments. A look-up table provides cosine and sine values for incremental angles which are multiplied by major and minor axis scale factors for a selected ellipse. Global input parameters permit rotation of all arcs and vectors to generate orthogonal projections, thereby producing 2-D and 3-D symbology.

Abstract: A cased telescoped ammunition round includes a propellant charge disposed in a tubular case. The case is composed of a skin tube and end caps on opposite ends of the tube. The case defines a chamber that contains the propellant charge. The charge has an axial bore containing a control tube at least at an aft portion of the bore. The control tube is attached at least at its aft end to the aft one of the case end caps. A projectile is housed within a forward portion of the axial bore of the propellant charge, and a primer is disposed within an aft portion of the control tube. The primer is actuatable for igniting the propellant charge to cause firing of the projectile forwardly from the case.

Abstract: A shock wave initiator device for initiating a percussion primer includes a primary explosive, an attenuation body, and a deflagrating member. The primary explosive is of a type which upon ignition is capable of detonation for producing a shock wave. The attenuation body is a block or core of material which at its exterior engages a cup of a primer enclosing primer mix and at its interior has a cavity housing the primary explosive. The body is capable of transmitting the shock wave produced by the detonation to the primer cup. The deflagrating member is preferably a rapid burn cord with one end communicating with the primary explosive and an opposite end communicating with a source of input energy for igniting the cord to cause burning thereof which, in turn, ignites and detonates the primary explosive.