Abstract: The circuit comprises a differentiator, two nonretriggerable-gated-monoste-multivibrators, a clock decoder, a data flip-flop unit, and a multiphase and frequency logic circuit. The differentiator checks the incoming Manchester encoded signal and divides it into two trigger signals one with data associated with logic "0" transitions within the Manchester signal and the second trigger signal containing data associated with logic "1" transitions within the Manchester data. One trigger signal is fed to one of the nonretriggerable-gated-monostable-multivibrator and the other trigger signal is transmitted to the second similar unit. Within these monostable multivibrator units the signals are gated and delayed by a tapped delay line which outputs a plurality of delayed signals which have waveforms built upon the occurrence of transitions within the Manchester signal associated with the logic "0" and logic "1" occurrences.

Abstract: This invention improves on explosively actuated cable cutters in that it orporates a remote capability of activating the cutter. The improved apparatus comprises an acoustical transducer for receiving a remote coded signal, an electric circuit designed to detect the specific coded signal, a motor and gear mechanism which is initiated upon detection of the remote coded signal to activate the explosively actuated cable cutter.The electronics and motor compartment are hydrostatically sealed and pitted with a pressure switch and a water intrusion fail-safe circuit. The pressure switch is designed to inactivate the apparatus beyond a preset ocean depth, and the water intrusion fail-safe circuit is designed to detect any seawater seepage into the sealed electronics compartment. Upon the detection of such seepage the intrusion fail-safe circuit disconnects the system from the battery thereby removing danger of premature triggering of the cable cutter.

Abstract: The invention is a safety circuit for torpedoes which causes lead weights be ejected when the torpedo is not running and is below a predetermined depth. It uses a CMOS multivibrator and NAND gates to pulse power to the existing pressure transducer and a comparator. This comparator checks depth and alternator power. When conditions are met, it holds power on and after five seconds, causes the weights to be dropped.The circuit is powered by existing batteries in the torpedo exercise head. To minimize any effect on the battery life, a strobbing technique is used where voltage is switched on for only a few milliseconds once every ten seconds. Depth is checked by the use of the comparator. One comparator input is connected to the torpedo's depth transducer and the other to a reference voltage in accordance with the predetermined depth limit. When the transducer voltage exceeds the reference voltage, the comparator turns on.One output from the comparator then latches-on for as long as the comparator is on.

Abstract: A low-power adaptive array for transmitting a signal may be used by itself in low-power applications or in high-power applications in conjunction with a commercial radio transmitter to optimize the radiation field of the transmitter used. The adaptive system comprises a continuous-wave (C-W) signal source having a certain amount of power. A power divider hybrid circuit, whose input is connected to the output of the C-W generator, divides its output power into N+1 parts. N quadrature hybrid circuits, one in each of N channels, whose inputs are connected to the output of the power divider hybrid circuit, divide their input signals into two quadrature components. One channel, a reference channel, does not require a quadrature circuit. A plurality of attenuators, each having inputs from the power divider hybrid circuit and the quadrature hybrid circuits, attenuates the power received from the quadrature hybrid circuit.

Abstract: An apparatus, using three gradiometers, measures the spatial variation of a agnetic field along a path of motion of the apparatus. The apparatus comprises three gradiometers oriented along the mutually orthogonal axes, x', y' and z' defined on the moving platform. The outputs of the gradiometers are the gradients of the magnetic field when the motion is considered to be in the y' direction. Three filters, each having an input connected to the output of one of the gradiometers, are constructed to have an output signal which has a relatively narrow positive peak with a relatively wide negative area on each side of the peak. The net area is approximately zero when the input to the filter is a doublet. Three squares, each having an input connected to the output of a filter, square their input signals. A summer, having three inputs connected to the outputs of the squarers, obtains the sum of the squares of the high-pass filtered components x', y' and z' of the magnetic field.

Abstract: A remote oceanographic data recording system which is self-contained batt operated and removably attachable to an external surface of a submerged hull without a need to penetrate said hull is presented. The system is capable of gathering and recording oceanographic data and may be joined to the hull of a submarine without interfering in submarine operation in any way. The system receives analog ac and dc electrical input signals from a variety of oceanographic data sensors and converts the signals to digital data signals for recording on magnetic tape cassette. The housing for the system is watertight and capable of withstanding external hydrostatic pressures up to 1620 psi.

Abstract: An apparatus is presented which will automatically lap involute and strai internal or external gear splines. Lapping force is applied alternatively to the left and right side of each tooth flank. Automatic indexing to new radial positions about the circumference of a gear after any preselected number of lapping cycles accomplishes the application of equal lapping forces to each tooth.The apparatus comprises a bed or support frame upon which is mounted a headstock assembly and a tailstock assembly. Mating workpieces, e.g., mating involute or straight internal or external gear splines, are fastened through collets to the mechanisms of the headstock and tailstock assemblies. The tailstock assembly includes a mainshaft attached to the collet holding its workpiece. The mainshaft is driven by a pneumatic piston to reciprocate along the axis of the workpiece causing the workpieces to lap one another.

Abstract: An apparatus and method is described for separately measuring the optical tensities of the following: a sample beam having traversed a sample medium; a backscattered beam having been backscattered by the sample medium; a composite beam composed of the sample beam plus a reference beam having traversed a reference medium; and a second composite beam composed of the backscattered beam plus the reference beam. Measurements of these parameters is accomplished through the use of a linearly polarized source beam whose plane of polarization may be rotated between two orthogonal planes. The source beam is split into the sample and reference beams. The plane of polarization of the sample beam is caused to be rotated 90.degree. from the plane of polarization of the backscattered beam after interaction with the sample medium.

Abstract: In improved cable cutter for undersea use is presented which has a self-cained, pressure compensated hydraulic system which allows it to operate in the deep ocean. The cable cutter is designed to operate from and mate with manipulators of Navy deep submergence vehicles. The concept of this cable cutter is a closed hydraulic system which provides driving force on a piston pushing a cutting blade against an anvil. The hydraulic power is provided by an internal gear pump. The gear pump has a drive shaft which mates with the rotary output of a deep submergence vehicle manipulator. The hydraulic fluid reservoir also serves as a pressure compensator for working in the deep ocean. The hydraulic fluid system comprises a main cylinder which contains the drive piston and a secondary cylinder which consists of a flexible tube that allows fluid pressure equalization with the environment as well as volume compensation. Both cylinders are mounted between manifold components.

Abstract: A sonar compensation transformer is added to a sonar transceiver circuit to btain calibrated optimum performance from a sonar transducer using ceramic rings by slightly modifying the voltage of the transducer while at the same time allowing the transmit circuit to operate without appreciable change.The sonar compensation transformer is an improvement upon a conventional sonar transceiver circuit containing a transformer winding connected in series with a diode switch with the outer bounding connections of the transformer winding and the diode switch connected to the transducer element while the connection to the sonar transceiver is from a connection tapped into the winding of the sonar transformer and the connection from the outer bound of the diode switch. The sonar compensation transformer is connected in with a primary winding placed in parallel with the diode switch.

Abstract: A shaft seal is presented which combines the attributes of the low pressure ealing of an O-ring and the high pressure sealing of a carbon face seal. This invention provides a dynamic shaft seal with the advantage of a very reliable, positive elastomeric O-ring seal for low pressure sealing and the advantage of a reliable graphite face seal for high pressure sealing incorporated into an integral configuration. This integral configuration allows a smooth transition between the low pressure O-ring seal and the high pressure carbon face seal without leakage. Springs are designed to provide the correct preload compression on the dynamic O-ring seal and the forces required such that the transition operation occurs at the proper differential pressure.Mechanically, a rotating shaft within an aperture in a pressure housing wall is fitted with a sleeve containing a carbon face seal that mates against the face of an elastomeric/graphite-interface seal.

Abstract: Method and apparatus for detecting tunnels, voids or other anomalies bene an area of the earth's surface wherein an oscillator couples a current into two conductors laid parallel to each other to generate two magnetic fields in the earth beneath the area. The magnetic field is measured along a line midway between the two horizontal conductors to detect for an increase in the measured field which is an indication of the presence of an anomaly.