Abstract: A controller for a locked carrier distributed multiplexed telemetry system hich uses on-off switching of a d.c. power supply and a pilot signal generator at a remote control unit. A pilot signal from the remote control unit is amplified and rectified. The d.c. rectifier output, occurring only during the presence of the pilot signal, is sensed by a comparator which provides rapid transition pulses to advance a counter. The counter is advanced one count for each pilot signal cycle (on-off-on) and is reset for each d.c. power supply cycle (on-off-on). The devices to be controlled are connected to the output of the counter.

Abstract: A jet engine compressor stage puller engages the lip of each disk and spa section of a jet engine compressor, and the end of the compressor shaft. A guide bar has a central threaded hole through which a bolt is threaded. A cup integral with the bolt engages the end of the compressor shaft. A pair of guide rods pass through slots in the guide bar, the slots being symmetrical about the central threaded hole. Shoes attached to the ends of the guide rods engage the lip of each disk or spacer section to be removed. As the bolt is rotated a force is exerted to pull the shoes upward, and thus loosen the disk and spacer stages without danger of damage to compressor parts or hazard to personnel.

Abstract: A handprinted symbol recognition system for identifying through computer techniques free-form, unconstrained handprinting in which accuracy is decoupled from efficiency converts a thin-line (skeletonized) figure output from a preprocessing system, in the form of an array of "black" image points from a raster line sampling, into segment-oriented lists. The segment-oriented lists are filtered and data compressed to obtain a reduced more suitable subset of points approximating the symbol for further processing. The topologic features of the image are extracted from the subset. Short segments that are potential spurs are removed, the image is rotated as necessary and normalized as to size. Each segment and their interrelationships are analyzed to extract geometric features for use in conjunction with the topologic features in a logic tree decision mechanism which uses three modules: (1) pre-recognition ("trash" filter), (2) potential symbol identification, and (3) final quality assurance.

Abstract: A dual channel peak detector having an automatic gain control (AGC) circuit aintains an internal replica of a gated input signal waveform at a constant peak level. An rf signal is input to a double balanced mixer to select that portion of the signal within the time interval of interest. A delay and gate generator circuit provides a variable delay from a sync input and generates a variable length gate which gates on the double balance mixer to pass the signal of interest to the remainder of the peak detector circuit. The gated signal is amplified and multiplied by a pseudo dc signal from the AGC circuit. The peak level of the resultant gated signal is detected. The detected peak level is sampled and input to the AGC circuit which computes the AGC circuit output voltage required to maintain a constant detected peak level amplitude. The AGC circuit output voltage is summed with the voltage from a second channel, and is also output as a dB value and a ratio between channels.

Abstract: A single element cantilever mounted shear wave transducer which takes advantage of the transverse vibration of a piezoceramic bimorph element mounted as a cantilever on a heavy slug. A gasket material between the slug and an inner holding tube assists in avoiding the propagation of undesirable compressional wave energy into transmission medium surrounding the transducer. Electrical isolation is achieved by wrapping the inner tube with a ground shield to which the ground wire is attached. A second layer of gasket material between the inner and an outer tube further inhibits the propagation of compressional wave energy into the transmission medium. A flexible potting compound seals the open end of the tubes including the bimorph element and serves as the active face of the transducer.

Abstract: An automatic strobe/camera control unit for sensing when the TV/strobe po is on and the camera is enabled, and for automatically triggering the TV/strobe and camera at a preset time interval. An A.C. input voltage is divided to provide operator variable trigger pulse intervals and fixed 5 minute and 15 minute intervals for record annotation. A preset time interval is checked for error and controls a timer which provides a trigger pulse at the end of each interval. A decoder detects a command from a TV rack. An output keyclosure and/or frame counter is disabled or enabled depending upon the decoded command.

Abstract: A shallow water environmental/oceanographic measurement system for real time monitoring of specific parameters at a particular location. A three point moored buoy is anchored over the particular location. Bottom mounted sensors to measure the specific parameters are situated generally within the area of the three point mooring area. Sensor data is transmitted via cable to the buoy from where it is telemetered to a shore station.

Abstract: An improved swirler assembly prevents flow separation in the diffuser secn. An annular swirling layer of air surrounds a linear jet with mixing occurring between these air flows prior to the diffuser section. A center tube through the swirler section provides the linear jet which mixes with the swirler flow in a mixing area prior to the diffuser section.

Abstract: A fluidic gain changer uses a fluid jet to mechanically deflect between two ets of fluidic receivers. A planar fluidic amplifier has its power jet, control jets and interaction regions bounded together to form a flexible tab than can be deflected in the third dimension. Two sets of receivers are located downstream and are offset so that the jet is evenly divided into the two sets of receivers when the tab is centered. Deflection of the tab increases the gain in one set of receivers while decreasing the gain in the other set of receivers.

Abstract: A portable, multi-signal electronic simulator device which provides the six basic parameters required for signal recognition training. A crystal controlled oscillator provides a precise timing signal, and is divided to provide a plurality of discrete frequencies. A modulation generator produces multiple, discrete signals depending upon the selected frequency from the oscillator and upon a preset selection of the parameters for each discrete signal.

Abstract: A generalized drifting oceanographic sensor (GDOS) is cast adrift in the oceanographic environment along a pre-programmed depth schedule. A variable buoyancy housing has one or more external oceanographic sensors and an external acoustic telemetry transducer. Signal processing electronics are contained internal to the housing together with an electric power pack and multiplexer. The data from the sensors are processed, multiplexed and transmitted by the acoustic transducer. Additional data are obtained from azimuthal correlation by two or more fixed acoustic receivers.

Abstract: A cable testing system which eliminates the swivel on the crane hook. Means are provided for attaching a crane weight indicator system (dial scale) to a crane lifting block directly. Steel bars are inserted through the block on the lifting pin and four short slings are attached to these bars. The weight indicator is then hung by these slings, with the cable to be tested connected from the weight indicator to a dead man in the ground.