Abstract: A data sample recording system having a memory for storing a predetermined number of data samples accumulated over various intervals of time. Each interval of time is divided into a predetermined number of subintervals, there being an electrical circuit for detecting the peak value of data occurring in each of the subintervals. The occurrences of the subintervals are synchronized with a periodic passing of a stylus across a recording medium in a recorder. The predetermined number of data samples is equal to the number of resolution elements of a line of data on the recording medium, stored data being fed out to the recorder in synchronism with the stylus movement to provide a display of data having a predetermined number of resolution elements of display independent of the length of the interval of time.

Abstract: A tracking system for use with an antenna having a multiple beam radiation pattern for sensing the direction of radiant energy incident upon the antenna. Pairs of the beams are selectively coupled to a monopulse comparator comprising a pair of hybrid couplers interconnected by a fixed phase shifter providing 90.degree. phase shift and by a pair of variable phase shifters providing phase shifts of equal magnitude but opposite sign. The output of the second hybrid coupler provides monopulse sum and difference signals. A sensing circuit responsive to the sum and difference signals operates the variable phase shifters to steer a null between the selected pair of beams.

Abstract: A transducer assembly in which a transducer unit of a piezoelectric material which is rigidly held between a rear member and a front member, both of which are made to vibrate upon energizing the piezoelectric material. Inductive elements comprising copper conductors wound about iron cores and utilized in the tuning of the transducer assembly are rigidly connected to one or both of the members and may also be connected to the transducer unit itself to serve as a portion of the inertial mass which imparts a mechanical vibrational characteristic to the transducer assembly. In one embodiment of the invention, the rear member is provided with a void wherein there is nested an inductor having an inertia similar to that of the material removed from the rear member in forming the void.

Abstract: A group of dielectric compounds and mixtures of dielectric compounds with useful properties at microwave frequencies is disclosed. The dielectric materials are temperature compensated, have relatively high dielectric constants, and comprise the group of BaTi.sub.4 O.sub.9, and mixtures of Li.sub.2 TiO.sub.3 and Li.sub.4 Ti.sub.5 O.sub.12, MgTi.sub.2 O.sub.5 and TiO.sub.2, Zn.sub.2 TiO.sub.4 and TiO.sub.2, and BaTi.sub.4 O.sub.9 and TiO.sub.2.

Abstract: A radiographic imaging system for high energy radiation utilizing a detector of such radiation and a mask having regions relatively transparent to such radiation interspersed among regions relatively opaque to such radiation. A relative motion is imparted between the mask and the detector, the detector providing a time varying signal in response to the incident radiation and in response to the relative motion. The time varying signal provides, with the aid of a decoder, an image of a source of such radiation.

Abstract: A simulator of a radiographic camera providing signals representing the magnitude of radiant energy incident upon the camera and the location of the radiant energy relative to the camera. The simulator is composed of electrical circuits which simulate the repetition frequency as a function of the amplitude of radioactive events and provide a series of amplitude modulated pulses having a distribution of amplitudes according to the frequency of occurrence of the amplitudes. A circuit providing randomly occurring values of location coordinates produces X and Y location signals.

Abstract: Samples of signals received by elements responsive to incident radiation, such as an array of sonar transducers, are obtained as exponents of the base two by a successive approximation register and decoder coupled together in a feedback loop by a comparator and a digital-to-analog converter. Weighting of samples from the individual transducers is obtained by adding scaling exponents to the sample exponents. Combining of samples to form a beam of received radiation is accomplished by summing together the antilogarithms of selected weighted samples.

Abstract: A scanning system for a gamma camera providing for the overlapping of adjacent scan paths. A collimator mask having tapered edges provides for a graduated reduction in intensity of radiation received by a detector thereof, the reduction in intensity being graduated in a direction normal to the scanning path to provide a blending of images of adjacent scan paths.

Abstract: A laser gyroscope system which detects frequency shifts in which waves are propagated along a path in opposite directions at different frequencies to minimize interaction between the waves with frequency separation of the waves maintained by both reciprocal and nonreciprocal polarization dispersion in which frequencies of the two waves propagating in one direction lie between the two frequencies of waves propagating in the opposite direction. Rotation of the system produces shifts of the frequencies so that variation in the difference between the separation between the two upper frequencies, which propagate in opposite directions, and the separation between the two lower frequencies, which propagate in opposite directions, is used to measure rotation rate.

Abstract: A digital data communication system employing quaternary phase-shift keying for transmission by a microwave radio link. The digital modulation of the quadrature channel is delayed from the in-phase channel by one-half the time duration of a bit so that the transmitted phase does not experience a quantum shift in excess of 90.degree.. This permits the use of an injection locked oscillator as an amplifier of the microwave transmission.

Abstract: A sonar system comprising a curved transducer array, typically in the form of a cylinder, in which the transducer elements are arranged in geometrically similar configurations on each of a plurality of planes having symmetry about a common axis. In the presence of an incident beam of radiant energy, the transducer elements are excited by signals having values of delay which vary from transducer to transducer in a regular pattern resulting from the symmetry of the array. This permits the utilization of a relatively small memory for the storing of delay values as a function of the bearing and tilt of the center line of a receiving beam relative to the axis of the array. The delay values are read out of the memory via switching and recycling circuitry to successively apply a sequence of delay values to delay elements coupled to the transducer elements to accomplish a steering of a transmitted or received beam in both elevation and azimuth.

Abstract: A package heat exchange system having a burner positioned in the central plenum of a first heat exchanger and supplied with a fuel-air mixture through a blower supplied with fuel through a pressure regulator which requires a negative pressure at the blower input to draw gaseous fuel through the pressure regulator. Thermal energy is transferred from the first heat exchanger to a second heat exchanger or from the second heat exchanger to a third heat exchanger by pumped fluids and transferred to or from the second heat exchanger and air blown through the second heat exchanger to heat or cool the air with blowing of the air, operation of the burner and heating of the first heat exchanger when the burner is not operating being used to maintain the temperature of the surface of the first heat exchanger which contacts the products of combustion of the burner above the dew point of the products of combustion.

Abstract: An extended radiating aperture for X-rays is provided by means of a stationary target of an X-ray emissive metal positioned for uniform illumination by high speed electrons emanating from a cathode and accelerating through a difference of potential between the cathode and the target. The target is in the form of a relatively thin film which can be deposited on a substrate transparent to X-radiation. The substrate cools the target. The generator is advantageously utilized with a zone plate which provides a coding on a roentgenogram which is then decoded by an optical processor to form a visible image of an object being X-rayed. An alternative embodiment of the invention includes the use of an inclined transmissive target for enhanced monochromaticity to emitted radiation.

Abstract: A transducer composed of a plurality of transducer segments arranged along a line with electrodes positioned between the segments and a pair of end electrodes positioned at opposite ends of the line of transducer segments. The two end electrodes are electrically coupled. Alternate ones of the remaining electrodes are coupled to the terminal pair of a signal generator which electrically activates the transducer segments to convert the electrical signals to vibrational energy for the radiation of sonic energy from the transducer. This arrangement reduces the electrical potential between the electrodes and a metallic case which encloses the transducer.

Abstract: In a gamma camera having an array of photomultipliers coupled via pulse shaping circuitry and a resistor weighting circuit to a display for forming an image of a radioactive subject, the improvement being a linearizing circuit coupled to the weighting circuit, the linearizing circuit including a nonlinear feedback circuit with diode coupling to the weighting circuit for linearizing the correspondence between points of the display and points of the subject.

Abstract: A radiographic imaging system coupled to a movable table for repositioning subject matter at the conclusion of a scanning of an area of the subject matter. The imaging system is further coupled to a plural axis recording system in which a recording implement, such as a flashing light source, is driven in synchronism with a scanning motion of the imaging system along a recording medium such as a photographic film. Controller circuitry is coupled between the movable table, the imaging system and the recording system for synchronizing their respective operations and for selectably scaling the movement of a drive unit relative to the movement of the scanning. A large subject such as a complete human being may be scanned by repositioning the subject and the movable table at the conclusion of each of a sequence of area scans of the imaging system, and by scaling the output of the scanning system so that the successively scanned regions of the subject can be recorded upon a single standard size x-ray film plate.

Abstract: A package heat exchange system having a burner positioned in the central plenum of a first heat exchanger and supplied with a fuel-air mixture through a blower supplied with fuel through a pressure regulator which requires a negative pressure at the blower input to draw gaseous fuel through the pressure regulator. Thermal energy is transferred from the first heat exchanger to a second heat exchanger or from the second heat exchanger to a third heat exchanger by pumped fluids and transferred to or from the second heat exchanger and air blown through the second heat exchanger to heat or cool the air with blowing of the air, operation of the burner and heating of the first heat exchanger when the burner is not operating being used to maintain the temperature of the surface of the first heat exchanger which contacts the products of combustion of the burner above the dew point of the products of combustion.

Abstract: A display and power supply system in which the power assembly uses a switching frequency which is higher than the highest linear deflection rate used in a cathode ray tube display device supplied by the power supply and in which the frequency of the power supply and the information repetitively displayed on the display are synchronized to eliminate interference of the power supply frequency with the display characteristics.

Abstract: An organic carbon analyzer system particularly adapted for the continuous analysis of raw sewage of a municipality. A gaseous transport is provided for carrying acidified liquid sewage including dispersed particulate matter through an elongated aeration chamber wherein carbon dioxide evolved from inorganic salts diffuses away from the sewage and into the gas. A second gaseous transport free of carbon dioxide and including an oxidizing agent then carries the sewage into a heated chamber having a tortuous interior surface which provides sufficient retention time to oxidize organic carbonaceous materials of the sewage resulting in a second evolution of carbon dioxide. An analyzer provides a continuous reading of the concentration of the carbon dioxide produced in the heated chamber.

Abstract: A nuclear imaging device comprising a plurality of scanning heads spaced apart in a predetermined configuration with the aid of a support member that permits the individual scanning heads to scan in parallel, antiparallel, and tomographic modes. The support member which is driven in both X and Y directions is mechanically connected with the stylus of a graphical X-Y plotter via a backlash linkage. Displays are provided wherein the color of the ink dot on printed paper or the intensity of the light projected on photographic film are related to the nuclear particle count in a preselectable manner.