Abstract: A system having a plurality of parallel tuned receiver channels, wherein a normalized phase relationship is maintained in the respective channels between amplified pulsed high frequency carrier signals having a given frequency is disclosed. Each of a plurality of parallel channels for receiving pulsed high frequency carrier signals from disparate sources includes a tuned frequency amplifier for amplifying a given frequency component of a signal in the channel within a predetermined bandwith. A continuous wave reference signal having the given frequency is inserted into each channel before the input of the tuned frequency amplifier. For each channel a phase comparator compares the phase of the reference signal components of the amplified signal with the phase of the reference signal; and a phase adjuster controlled by the phase comparator responds to the phase comparison by adjusting the phase of the signal that is provided to the amplifier.

Abstract: A method of making a relatively thick dry film stencil for uses such as depositing solder paste through a screen chase. A stencil consisting of four mil thick dry film photoresist is formed by passing the photoresist layers through a roller and laminating them onto a support screen. The outer protective film coatings are removed and the film photoresist developed. It is then placed in a chase with the developed film face on the bottom. The solder paste is then squeegeed through the screen and deposited on a desired part. An alternate method of making the stencil uses two layers of dry film photoresist laminated together with the protective film coating removed. The stencil is cut to the size needed and exposed. Using a hydraulic press, the stencil is then connected to a screen in a chase by applying a pressure of 250 psi at 300.degree. F. for 10 seconds.

Abstract: A device for limiting the travel of an arbor press when pressing inserts into a panel. Two insert halves are pressed into a panel from opposite sides by means of an upper and lower anvil. The press movement is stopped by the device when a specified gap between the insert head and the exterior surface of the panel is obtained, compensating for any variations in the panel thickness.

Abstract: A system utilizing a rocket plenum design which is of a form to reduce and control combustion therein. The plenum is provided with two oppositely and upwardly extending exhaust ducts. Provision is made to eliminate blind pockets and stagnation passages in order to prevent possible explosions in the plenum during rocket firing.

Abstract: A system for dispensing a large number of submunitions from a missile or aircraft in uniform selected pattern. Small, cylindrical submunitions are carried in ejection tubes in a generally cylindrical housing. Sets of tubes are arranged in parallel planar arrangement approximately perpendicular to the housing longitudinal axis, with different sets at different angles to vertical. Timing means cause the submunitions to be ejected at selected times, and drag means on the individual submunitions are actuated at selected times so that the submunitions strike the ground along lines perpendicular to the line of housing mount. This system is especially useful with low-flying cruise missiles in attacking airfields, since a plurality of cuts across the airfield can be inflicted as the missile traverses the length of the field.

Abstract: An automatic system for sensing and establishing the set point for numerically controlled machine tools. Before operating a numerical control (N/C) machine tool, such as a milling machine, it is necessary to precisely locate a basic reference point on the workpiece or work holding fixture. The disclosed system comprises a capacitive bridge sensing device positioned at the set or reference point. When a machine tool is positioned precisely at the set point, a null reading is observed on suitable readout means. When the tool is moved from null, a reading proportional to displacement is observed. The sensor basically consists of four individual capacitor plates arranged in a circle around a center point, in "X" and "Y" directions. The plates are excited by an audio oscillator and coupled into a bridge instrumentation oscillator. As a grounded machine tool is moved adjacent to these plates the capacitance between the individual plates and the grounded tool varies.

Abstract: A method of fabricating a bonded composite structure, such as a missile fin, includes the step of forming uncured components for the composite structure with appropriate molds. The individual components are placed together to form an unbonded composite of the structure. The unbonded composite is inserted into a female mold of the composite. The female mold is comprised of material having predetermined high thermal expansion properties. The female mold with the unbonded composite inserted therein is enclosed in a rigid container. The container is heated to expand the mold, apply pressure to the composite, and bond the components of the composite together in a single curing cycle.

Abstract: A method and apparatus for loading solder preforms on to the pins of a multiple pin connector. A positioning plate has open sockets in the pattern of the pins of the connector to be loaded, the sockets being sized to receive a single solder preform in each one. A slidable retainer fits into a channel below the positioning plate to partially close the sockets and retain preforms therein. Loose preforms are contained in a dam attached to the top of the positioning plate and are shaken into the sockets on a vibrator table. The dam and excess preforms are removed and the positioning plate is covered by a cover plate to hold the preforms in place. The connector pins are then inserted through slots in the retainer, through the preforms and through holes in the cover plate. The retainer is removed, allowing the preforms to drop on the pins and the loaded connector is removed from the apparatus.

Abstract: High stability thin film resistors are made from an alloy comprising selected portions of nickel, chromium, and gold selected in a ratio to provide the desired temperature coefficient of resistance (TCR). The resistors are made by co-depositing gold with the nickel chromium alloy by a flash evaporation process. The evaporation process is carried out by feeding a nickel chromium wire, having a gold wire extending therealong to provide the desired composition, onto a heated tungsten strip within a vacuum system with substrates disposed in a position to obtain uniform deposition of the evaporated material thereon.

Abstract: A system for obtaining a vertical profile of water quality in a body of water is disclosed. The system includes a sensor for sensing predetermined characteristics of water and the depth of water at which the predetermined characteristics are sensed, a cable attached to the sensor for holding the sensor, and a winch assembly attached to the cable for deploying and retrieving the cable and the sensor in a body of water. The winch assembly includes a non-ventilated DC motor coupled to the drum for driving the drum to retrieve the cable, and for generating electricity during deployment of the cable in response to the torque on the motor created by the cable and the sensor during deployment, an electromagnetically released brake coupled to the motor for braking the motor when the brake is not energized, a battery for providing energy for the motor and the brake, and a motor controller coupled to the battery for providing constant voltage excitation of the motor and for controlling the brake.

Abstract: Welding composition for welding a compatible steel having exceptionally high strength and high fracture toughness, which consist essentially of iron containing respective percents by weight of constituents as follows: 0.12-0.20 carbon, 1.8-2.2 chromium, 0.9-1.1 molybdenum, 12.0-14.5 cobalt, 9.0-10.5 nickel and a deoxidizer selected from the class consisting of (a) 0.05-0.20 manganese, (b) 0.010-0.035 aluminum, (c) 0.01-0.20 silicon, (d) a combination selected from among (a), (b), and (c), and (e) a combination selected from among (a), (b), and (c) and 0.02-0.10 vanadium; the composition having a concentration of respective constituents adjusted to have an ultimate tensile strength of 210-250 Ksi (thousands of pounds per square inch), a tensile yield strength of 200-230 Ksi and a Charpy V-Notch absorbed energy of at least 30 foot pounds and produce a weldment having satisfactory strength, toughness, and stress corrosion resistance.

Abstract: A device to code a machine tool holder, to preset the tool length, to mount the tool in the holder, and to inspect tool dimensions and coding. These functions are performed by a ring selector which selects different outside diameter rings in such sequence that a desired indentification of a tool by a combination of lands and grooves is accomplished, by a power torque machine which tightens the tool holder collet, by a digital height and diameter gage device which inspects the tool dimensions, and by a digital ring counter which gives a digital readout of the land and groove combination on the external surface of a tool holder.

Abstract: A mechanism for deploying and retracting an isogrid structure particularly suited for use in supporting low weight reflective or absorbtive surfaces, characterized by a plurality of hinged isogrid panels stowed in an accordion folded stack arranged for automatic deployment into a long continuous strip or array. Two deployment arms in contact with the stack of panels are rotated to a position perpendicular to the stack, carrying with them a perforated deployment tape that is attached to the first panel. The tape is engaged to sprocket drives which draw the first panel from the stack. Thereafter, the panels are extended by the powered sprockets which engage perforations in the panel edges. A shutter sequentially releases pairs of panels during deployment. For retraction, the sprockets drive the panels back toward the stack where a creaser arm hinges pairs of panels which are thereafter folded into a stack by means of the shutter capturing and stowing each folded pair of panels.

Abstract: Method and apparatus for forming sheet material into continuous structural shapes, particularly adaptable to the forming and joining of reinforced plastic sheet material, wherein the material is heated, formed, joined, consolidated, and cooled in a continuous process.

Abstract: An improved back-up tape for use in fusion welding metal sheets and structures is disclosed. The tape comprises a rolled refractory fiber fabric partially flattened against an adhesive coated surface of a wider, heat resistant, strip. In use, the tape is pressed against the back side of a joint or other weld line to be welded with the adhesive bonding the tape along strips parallel to but slightly spaced from the weld line and the roll pressed against the joint. Fusion welding is conducted without the addition of any filler wire. A flat weld underbead, with no molten metal drop-through is produced, with no melting or other significant change in the tape. The tape is then stripped off and the welded structure is ready for use.

Abstract: A pair of carton liner removal tongs for use in removing carton liners from cartons includes an elongated shaft portion with a knife blade like hook extending outward from one end and a looped handle at the other end extending on the opposite side of the shaft from the hook. The tongs are used in removing a liner from a carton by first inserting the hook end of the tong downward between the walls of the liner and carton on opposite sides of the liner. The handles of the respective tong members are then brought together above the carton liner and grasped by one hand for pulling the liner upward and out of the carton.

Abstract: An electrical connector having means for suppressing electromagnetic interference when the connector pins are separated from the pin sockets. To this end, each of the connector pins or each pin socket is contained in an electrically conductive housing. The housing forms an open space about and extending beyond each pin or socket. This open space forms a waveguide having a predetermined upper cutoff frequency. This cutoff frequency depends on the length of the waveguide measured from the tip of each pin or socket to the end of the waveguide and on the diameter or largest dimension of the waveguide, which may be a cylindrical waveguide. Each of the corresponding pin sockets has an outer insulation tube which fits into the open waveguide. Further, each pin socket is provided with a spring contact for making electrical connection to the respective connector pins. The cutoff frequency of the waveguide is selected to be substantially above the highest frequency of the expected electromagnetic interference.

Abstract: Solar energy collectors, devices and systems utilizing selective solar absorbers for more efficient collection of radiant energy from the sun and its conversion to useful form at relatively high heat transfer temperatures. Each collector unit is made up solely of a closed shell-like enclosure having a continuous, unpenetrated boundary wall evacuated and hermetically sealed to form a structurally strong radiation collecting chamber whose boundary wall surrounds a rarified atmosphere environment such as a vacuum, the wall having a window portion which transmits substantially all of the received solar spectrum to a selective solar radiation absorber in the chamber and energy derived therefrom is collected at any energy collecting and transferring portion of the wall from which heat is conducted to the exterior.

Abstract: Carriers forming strips for semiconductor integrated circuit chips. The carrier consists basically of a flexible tape, such as a polyimide. A conductive sheet, such as a copper sheet, is initially prepared to form a lead circuit on one surface and a bump circuit on the other. This metal sheet may be gold plated. Subsequently, a layer of polyimide is applied to the lead circuit side and both the polyimide sheet and the opposite bump circuit are covered with a metal sheet, such as copper. A photoresist layer is put over the copper and is suitably illuminated and developed to provide apertures through which the copper can be etched to expose the polyimide sheet. This takes place over the windows or openings adjacent the bumps for the application of a heat ram as well as for the sprocket holes used for precisely aligning the carrier with the to-be-associated semiconductor chips. Finally, openings may also be provided to separate adjacent carrier strips from each other.

Abstract: Inspection for hole quality in structures is enhanced by inserting a smooth, thin-wall hollow sleeve into a hole to be tested and moving an eddy current probe within the sleeve. Mechanization is improved by apparatus which inserts and holds the sleeve in the hole and has drive means operable so as independently to rotate the probe or move it linearly, or both, within the stationary sleeve.