Abstract: A family of catoptric lens arrangements is provided for focusing a maximum mount of light from an omnidirectional source into a parallel or conical beam. A rear spherical-curvature reflector is inserted into a conventional forward spherical plus rear parabolic reflector arrangement, with its center of curvature and the light source both at the focal point of the parabolic reflector. In addition, a forward collimating lens is substituted for the central portion of the forward reflector. The theoretical 100% efficiency achieved by this arrangement is independent of the diameters of the forward and rear reflectors provided, of course, that the positions and curvatures are suitably compensated.

Abstract: A wedge assembly for spacing apart batteries which permits a complete range f operation with all components remaining intact in their assembled form is provided. A central or inner wedge having a plurality of identical wedge sections is movable between a pair of outer wedges or side plates having mating inner sections and a planar outer surface. Wedging action is produced by torquing a bolt secured to the outer wedges and threaded through a nut secured in the inner wedge. The wedging components are held together and in alignment by screws attached to the inner wedge and guided through slots formed in the outer wedges.

Abstract: A force-displacement controller knob for use in isometric control devices provided. A controller knob component is mounted on existing control shafts and the knob itself contains a pair of compressible, resilient washers separated by and contacting a rigid washer in a chamber in the knob so that force appied in any direction on the knob will be transferred to the control shaft in a resistance ratio determined by the compressibility of the resilient washers.

Abstract: The disclosure concerns an electrical contact for conducting high current densities in a minimum space at acceptable operating temperatures and lower contact resistance than conventional slotted contacts of equivalent size. The contact pin is formed in a series of cascaded extensions and the contact receptacle contains respective sections each threaded or otherwise joined within the other. The external receptacle section and the cascaded pin are made of oxygen-free copper for maximum conductivity.

Abstract: An acousto-optic guided-light beam deflector of improved bandwidth utilizes at least two tilted surface acoustic waves of different frequency which are launched and phased such that the Bragg diffracted light from each surface wave interferes constructively.

Abstract: A method of and apparatus for balancing rotating machinery components which ncorporate butted flanges or faces is provided. A circumferential slot is formed on the interior face of one of the flanges and a hole is bored in either flange communicating with the slot. A sheet metal lock is inserted through the hole along the side surface thereof and a balancing weight or counterweight is inserted adjacent the lock. End tabs in the lock which extend in opposite directions are bent to support and retain the counterweight within the hole in the flange.

Abstract: A rigid metal holder having perforated side plates for containing plastic gs of human red blood cells for both freezing and thawing such cells is provided. Hydroxyethylstarch, HES, is used as the cryoprotective agent and, together with the perforated metal plates, permits the very fast freezing rates required to produce viable red cells. The HES is transfusable with the thawed cells so that post-thaw washing is obviated.

Abstract: A two-way fluid flow metering pump for accurately measuring the rate of f of a liquid is disclosed. A section of a cylindrical shaft is disposed in a bearing made of metal or a fairly rigid nondeformable plastic. An indentation or notch is made in a shaft section passing an inlet and outlet in the bearing, and liquid is transported by the indentation or notch from the inlet to the outlet, or vice versa, depending upon the direction of shaft rotation. A rubber or soft plastic seal inserted in an opening in the bearing remote from the inlet and outlet deforms and conforms to the shaft indentation at each rotation so that the liquid is not transported past the seal.

Abstract: Hardening of an electromagnetic wave sensor is accomplished by housing it low ground in a protective reinforced concrete structure that supports a cage of insulated conductors that has an interior portion that partially surrounds the sensor so as to shield it from electrical disturbances and an exterior portion that interacts with electromagnetic wave energy present at the ground level and improves the signal couplng to the sensor.

Abstract: An electrostatic discharge system for neutralizing the charge accumulated an aircraft utilizes a pair of unequal length probes to sense the intensity of the external electric field. A transformer arrangement energizes these probes with out-of-phase voltages such that the corona currents flow in opposite directions through these probes. The dual probe configuration eliminates any errors due to environmental changes, while the out-of-phase excitation mode allows the AC component of the output signal to be canceled at a load resistor in the sensor circuit by a subtractive process, a feature which greatly simplifies the filtering operation.

Abstract: A radar receiver employing digital signal processing utilizes high-speed ut buffers in the form of charge coupled devices that lower the data rate to the analog-to-digital converters so as to reduce their response requirements and, thereby, their cost while still permitting the system to achieve a high degree of range resolution.

Abstract: A method of salvaging granulocytes, or white cells, from buffy coat of ceifuged whole blood is provided. The sequence of operations leading to the separation red cells, white cells, platelets and plasma is presented in a flow diagram of a bag system for the cryopreservation of leukocytes, with freezing of the white cells accomplished by the introduction of a combination of hydroxyethyl starch (HES), which functions as both a sedimenting agent and a cryoprotective agent, and dimethylsulfoxide (DMSO), a cryoprotective agent. A preferred combination is 4% HES with 5% DMSO. White cell separation is interfaced with collection methods for plasma and platelets so as to conserve all major cell types.

Abstract: A high energy laser mirror formed from a single block of nickel and having secondary coolant circuit for promoting low distortion is provided. Parallel slots of alternating and selected depth are machined in the block and connected to manifolds drilled so as to direct flow of coolant in opposite direction in adjacent slots. The ends and tops of the slots are closed by electrodeposition of nickel, completing a structure which is thermally stable at levels of operation requiring the absorption of several kilowatts of power.

Abstract: A two-dimensional dye laser scanning system is provided wherein a dye laser having a controlled output wavelength is combined with a diffractive beam-bending device to produce a near infrared or visible laser beam that can be directed to scan in two orthogonal planes at 100 MHZ rates.

Abstract: A doppler signal modifying a carrier wave has its sign reversed by a circ which includes a pair of signal sources whose frequencies are above and below that of the carrier by equal amounts. The original signal and one of these sources control a first flip-flop, while the other source and a voltage controlled oscillator, whose frequency is normally set to that of the carrier, control a second flip-flop. The square waves thus produced, which have frequencies corresponding to the difference in frequency between the control signals, are applied in particular combinations to a pair of exclusive OR gates, whose outputs are integrated and then combined in opposition to develop an error signal which controls the voltage controlled oscillator. The output of this oscillator, when this error signal is minimized, is the desired signal.

Abstract: A control system for rotary wing aircraft having a circulation controlled tor is provided. Two axial flow air compressors driven from the engine input shaft provide an air flow which is ducted to the rotor blades through a bifurcated duct and a non-rotating air plenum and released through spanwise slots in the blades. Damping is accomplished by a conically shaped diverter valve in the air plenum and a butterfly valve adjacent the air compressors. Aircraft stability is achieved through a gyro coupled to the rotor shaft which integrates pilot controlled input with rotor cyclic flap moment input.

Abstract: There is disclosed a technique whereby a dielectric grating disposed on a in film that has a surface wave propagating thereon can concentrate the power from this wave into a beam that is either above or below the grating according to the profile of the grating. By this technique, surface waves traveling in different directions can be distinguished and the efficiency of optical beam couplers can be improved, among other applications.

Abstract: A multilayer cylindrical or rectangular shielding container oriented to pect computer components primarily from magnetic and electromagnetic field disturbances of cloud-to-ground electric lightning strokes is provided. The shielding container is formed of spaced magnetic and nonmagnetic walls. The container preferably is oriented vertically, and leads and cables entering and leaving the container are passed through the top and bottom ends thereof to provide maximum protection from electric fields and from the the predominantly horizontal components of the magnetic field vectors that propagate from such strokes.

Abstract: A square wave to sine wave converter of the type which utilizes an integrr, an amplifier and a sine wave shaper in the signal processing operation has an automatic gain control circuit which responds to signal variations both at the output of the integrator and the output of the amplifier to insure a constant amplitude triangular wave at the input of the sine wave shaper as the frequency of the square wave changes.

Abstract: A number of magnetic and memory signatures are developed for defining the equacy of a coated substrate for memory wire applications. The signatures are determined from sets of films on substrates which characterize good wire and can be used to separate the marginally good from the marginally poor substrate by applying tests at selected steps in the processing of newly coated wire. Separate signatures are established by omitting steps or varying combinations of steps in conventional plating processes and then measuring the magnetic or memory properties from section to section or from bit to bit along the wire.