Abstract: Optical detecting and ranging equipment of high information gathering and processing capacity employs a pulsed coherent source illuminating with each pulse a line field of view. An optical receiver monitoring the entire field of view has a scanner that causes reflections received at different times to be recorded at correspondingly different coordinates.

Abstract: An inertial measurement device comprising a rotatable member having a fluid-filled chamber closed by a resilient member responsive to the forces acting on the fluid and a modulator coupled to the resilient member to alter the radiation from a light source to a detector depending upon the response of the resilient member.

Abstract: Apparatus for generating horizontal and vertical synchronization signals in synchronism with synchronization signals generated by an ongoing television program received by a user without internal connections to the user's television receiver, is provided by optically extracting pulses from a displayed raster of the ongoing television program and generating therefrom the synchronization signals in synchronization with the ongoing program.

Abstract: A method and apparatus are provided for increasing the heat transfer efficiency of a heat exchanger by utilizing a high intensity RF field. Either an ion stream generated by the RF field or the RF field itself results in the efficiency increase and the rate at which the fluid acquires energy from the heat exchanger is enhanced to the extent that the boundary layer normally present at the walls of the heat exchanger which impedes the transfer of heat from the heat exchanger to the fluid breaks down during this process. The RF technique is utilized in one unique application for increasing the efficiency of solar energy receiver which operate at temperatures exceeding 1,500.degree. F in that the system eliminates arcing which would occur due to the high temperatures involved, if electrostatic (D.C.) ion spray devices were used.

Abstract: A shielded passageway for use between electromagnetic interference shielded shelters includes two or more rigid telescoping members in a loose fit with EMI shielding material between the overlapping sections. In one embodiment a truncated toroidally-shaped rolling diaphragm shield of wire mesh is interposed between the overlapping sections to permit relative movement therebetween while maintaining or providing EMI shielding. In another embodiment the passageway is provided with an articulated stable walkway attached at either end to respective passageway sections for permitting relative movement between the overlapped passageway sections.

Abstract: A capacitor matrix correlator is provided for correlating two or more periodic signals in which a passive correlator is provided with a summing circuit implemented on the same printed circuit board utilized to form the capacitor correlator matrix. The capacitor correlator matrix and summing circuit are manufactured through the use of face to face printed circuit boards having overlying sections patterned and registered so as to form the capacitive elements, thereby simplifying the manufacture of the capacitive correlator and summing circuits.

Abstract: A room temperature, optically pumped, solid state laser operating at 0.75 micrometers including a Ho.sup.3+ :LiYF.sub.4 crystal provides an excellent source for optical target location systems and other applications which require a source of high peak power in the spectral region just beyond the visible - the "Deep Red".

Abstract: Power for an r.f. oscillator/modulator located at the antenna input terminals of a television receiver is derived from synchronization signals generated remotely from the receiver and applied to the r.f. oscillator/modulator via a cable.

Abstract: A single reticle is provided having spectral and spatial filtering characteristics such that it may be employed in radiation responsive systems for both passive tracking and active tracking employing a laser target designator.

Abstract: LORAN-C navigation equipment is disclosed wherein digital circuitry is used to automatically distinguish a master LORAN-C transmitting station from a secondary station. The equipment operator manually enters approximate time difference of signal arrival information for a particular secondary station into the equipment after consulting a LORAN-C chart. The operator then manually determines the exact time difference of arrival using thumbwheel switches and a LED lamp display. This procedure is repeated to determine exact time difference of arrival information for the master and each selected secondary station, and the information is plotted in a well-known manner on the LORAN-C chart to locate the position of the craft upon which the equipment is located. Manual acqisition of secondary stations simplifies the equipment and eliminates interference problems caused by skywaves and other transmissions.

Abstract: Reduction of interference from off-frequency signals in an a.m. receiver is achieved by substituting an average detector for the conventional peak detector employed in such receivers. Conversely, enhancement of off-frequency signal reception is achieved by employing an average detector in parallel with a peak detector with their outputs subtracted.

Abstract: A beam projector is provided by a plurality of coded reticles mounted on a spinning disc and illuminated by a laser source. In order to maintain a constant irradiance on a receiver variably located in space a pseudo-zoom assembly is provided including a moveable source and/or condenser optics. Also, plural focal length optics are employed to expand the range over which the constant irradiance is maintained beyond that realizable by the pseudo-zoom assembly itself.

Abstract: A sensitive, noise-free ellipsometer measures depolarization of an incident beam by forming from the reference and signal components of the incident beam a signal component polarized in one direction, and a frequency shifted local oscillator component polarized in the same direction, with these latter components being optically heterodyned at a detector. In the formation of the local oscillator component, the reference component of the incident beam is shifted in frequency from that of the signal component of the incident beam and rotated 90.degree. from its original orientation so that optical heterodyning can take place. This is accomplished by passing the incident beam through a shear-wave, traveling wave acoustic modulator which forms local oscillator and signal beams, each having rotated and frequency shifted components, and unrotated and unshifted components.

Abstract: A method and apparatus for controlling the runout and initial recoil velocity of an artillery piece is disclosed in which variables of barrel elevation and the impulse delivered by a round of ammunition are hydraulically sensed as pressures trapped in actuators which control the flow of fluid to the recoil cylinders of the artillery piece. The system provides for a predetermined constant deceleration of the recoiling barrel assembly regardless of the type or power of the round utilized. When a constant predetermined deceleration is provided, the recoil velocity is uniquely determined and an automatic system is provided for assuring that the loading of the artillery piece always takes place at the same instant of time and that the barrel assembly will have decelerated sufficiently to prevent damage to the snubbing apparatus carried by the artillery piece.

Abstract: Pulse stretching and smearing due to forward scatter of a collimated beam from a light source is eliminated by the use of a multiple field of view detector which divides up the beam in the vicinity of the receiver into segments along the optical path of the beam, inverts the order of the signals from the segments, and delays the signals by predetermined amounts such that pulses from different segments overlap and add, with the delay set to compensate for different path lengths between the transmitter and the receiver due to the intercepting of various segments along the optical path by the fields of view of the individual detectors making up the multiple field of view receiver.

Abstract: Apparatus for generating horizontal and vertical synchronization signals in synchronism with synchronization signals generated from an on-going television program received by a user is provided by employing a capacitive or inductive coupling to extract the electric or magnetic field surrounding the horizontal output transformer and deflection yoke of a television receiver and shaping the output of the coupler to provide pulses at the horizontal synchronization rate of the received program. These pulses are further multiplied, divided and shaped to provide vertical synchronization pulses. The dividing circuits include means for temporarily changing the divisor to accomplish proper framing. Auxiliary presentations can be displayed in conjunction with programs normally received by synchronizing the auxiliary presentations with the received programs by employing the generated synchronization signals.

Abstract: Apparatus is herein disclosed for imminent collision detection equipment for acknowledging proximity between a first object carrying the equipment and a second object. The imminent collision detection apparatus is a radio distance measuring device and includes a transmitter and a receiver. The transmitter has a pulsed energy output which is reflected back by a target and mixed with a reference source of pulsed energy generated a predetermined time after the transmitted output and coherent thereto. The coherent feature of the equipment lies in the fact that the transmitter pulsed output and the pulsed reference signals are both generated with the same starting phase each generated pulse. Furthermore, the transmitted and reference signals are jittered to provide a resistance to countermeasures capability.

Abstract: Apparatus is disclosed which generates simulated radar target signal returns that are input to radar equipment to test the equipment and to train radar operators. A small number of individual simulated radar target signal scenarios are provided which are easily selectively combined to provide a large plurality of training scenarios on a radar display. The equipment provides such features as multiple aircraft display, terrain masking, variable target size, range gate splitting, identification friend or foe, and ambiguity checking. The radar signal generator apparatus utilizes a stored binary data word representing each simulated radar target trace and each data word contains bit fields for each of the above target features as well as the simulated target position on the radar display indicator. A single counter driven by the radar system clock is used to generate binary numbers that are compared to the target position information of each stored target data word.

Abstract: A method and apparatus for testing and evaluating the runout and recoil control systems for a gun in which a body having a mass representative of the mass of the moving parts of the gun is accelerated under the control of the runout system under test and then decelerated under the control of the recoil control system under test. During both acceleration and deceleration various conditions such as the position and velocity of the body are measured and recorded.

Abstract: A fluid .[.Flow Restrictor.]. .Iadd.flow restrictor .Iaddend.especially suitable for reducing the pressure of gases or liquids is described. The restrictor comprises a series of rows of baffles placed in the path of fluid flow, with the baffles in succeeding rows staggered with respect to those in adjacent rows so that as the fluid flows, it is constrained to change its direction repeatedly. The restrictor is preferably constructed with an increasing cross sectional area along the direction of flow. One suitable physical construction comprises a plurality of thin circular plates with a central bore, arranged in a stack. Each plate has a baffle pattern formed on one or both sides, for example, by etching. Fluid flow is from the central bore, between adjacent plates, to the circumference of the stack.