Abstract: Pyrotechnic removal of a radome cover may be accomplished by scoring longitudinal recesses 50, preferably at least four, on the inner surface 26 of the cover 18. Explosives cord 38, shaped to preferentially detonate outward, is placed in the recesses 50, and is backed with a backing 48 to prevent damage to the underlying radome 12. Annular explosive cord sections 40 and 42 are placed at the nose 28 and rear end 20 of the radome cover 18. A detonator 34 explodes all cords simultaneously.

Abstract: In the present invention STRESS-FREE CHEMO-MECHANICAL POLISHING AGENT FOR II-VI COMPOUND SEMICONDUCTOR SINGLE CRYSTALS AND METHOD OF POLISHING, a II-VI compound semiconductor single crystal wafer is polished smooth to within 50 angstroms by using a mixture of water, colloidal silica and bleach including sodium hypochlorite applied under time and pressure control to achieve chemo-mechanical polishing. Many such compound crystals are not susceptible to polishing by prior art methods.

Abstract: A precipitation hardening, high strength alloy, having a composition comprising in weight percent, 25.0% nickel, 15.0% chromium, 1.25% molybdenum, 0.25% vanadium, 2.65% titanium, 0.25% aluminum, 0.005% carbon, and the balance iron with incidental impurities.

Abstract: A broadband diplexer for use in dividing input signals in accordance with frequency and in constructing multiplexers including multiple diplexers. The diplexer includes a pair of 0-degree couplers one of which is configured as a signal splitter while the other is configured as a signal combiner. A pair of filters having identical frequency selection characteristics but opposite impedance and admittance characteristics are connected in between the splitter and the output port of the combiner. In operation, input signals are received at the input port to the splitter and output signals are provided at the isolation port of the splitter and the output port of the combiner. The coupler and filters act in combination to divide the input signals in accordance with frequency so that the output signals have complementary spectra. The use of 0-degree couplers allows for very broadband performance by the diplexer.

Abstract: This invention relates to an induction velocity meter and more particularly to such a device having a highly accurate digital output signal which is of simplified construction and high reliability as compared with prior art devices.

Abstract: Method and apparatus for using deep ultraviolet excimer laser beams to dice semiconductor substrates, such as sapphire, with or without integrated circuitry, by establishing guided relative motion between the beam and the substrate to achieve ablative photodecomposition with the angle between the beam and the substrate being approximately five (5) degrees out of normal.

Abstract: Low power tiltmeter electronics with compensation for bubble level fluid temperature include compensating methods both for temperature-induced conductivity changes and temperature-induced viscosity changes in the bubble level fluid of a tiltmeter. The conductivity changes are compensated for by comparing the difference between the tilt conductances with the average of the tilt conductances. The viscosity changes are compensated for with a critically damped bandpass filter and a thermistor filter.

Abstract: A filtering apparatus 30 passes an incident beam of light through a first lens having a first focal length, causing the incident beam of light 32 to be focussed, and then passes the incident beam of light through a pinhole 36 having an opening of a predetermined size. In accordance with one aspect of the invention, the pinhole 36 is spaced from the first lens 34 by a distance which is greater than, or less than, but not equal to the lens' focal length wherein only a portion of the incident beam of light passes through the opening of the pinhole 36. In the illustrated embodiment, the pinhole 36 has a size which is significantly larger than the nominal diffraction limited spot size of the first lens 34. The incident beam of light which passes through the pinhole is then directed toward a second lens 38 having a second focal length. In a preferred embodiment, the second lens 38 is spaced from the pinhole 36 by a distance substantially equal to the second lens' focal length.

Abstract: The low moving mass two axis gimbal shown here has a drive gimbal 10 and a payload gimbal 12 on a common central post 14. Each gimbal 10,12 has two axes 16,18,20,22. The rings 24,26 of the gimbals 12,14 are kept parallel to each other by three push rods 28,30,32, which are parallel to the post 14 and are joined to the rings 24,26 by universal joints 34,36,38,40,42,44. The distance between corresponding pivot points (46 and 52,48 and 54, and 50 and 56) is the same, and equals the distance from drive gimbal pivot 58 to payload gimbal pivot 60. In the drive gimbal 10, an X-axis motor 62 mounted on the central post 14 drives the X-axis 16, and a Y-axis motor 64 mounted on the X-axis 16 drives the Y-axis 18. Providing two small gimbal rings 24,26 instead of one large ring reduces the moving mass (rotational inertia) of the device, thereby producing quicker response times. Providing twin rings 24,26 also allow the device to fit within a narrower (although longer) volume than providing a single ring would.

Abstract: A fault-tolerant system for interfacing a single sensor unit to multiple display/control modules. The system includes a fixed resistor connected in series with the sensor unit and multiple data centralization units each including a source for providing a separate excitation signal to the sensor unit. The data centralization units also include detection circuits for measuring the voltage drop across the fixed resistor. The output from the sensor unit is adjusted according to the level of excitation provided to the sensor unit so that accurate measurements can be taken despite one or more data centralization units being non-operational.

Abstract: A rotary motor uses a plurality of radially acting piezoelectric actuators to impart rotation to a motor shaft having surface undulations. Electrical charge distributed to the actuators causes radial actuator motion resulting in contact between the actuators and the sloped sides of the shaft undulations. The slope of each undulation transforms the radial force into tangential force that rotates the shaft. The slope of the shaft undulations provides a mechanical advantage that transforms the slow radial speed of the actuators into greater shaft rotational speed. The shaft undulations can be made in any desired or easily fabricated shape. The electrical actuation control signals can be modified electrically to produce appropriate radial actuator motion to match the undulations of the shaft. Electric charge can be shared among actuators by using switches or other circuitry. Efficiency can be increased further by using acoustic excitation and by using rollers for contact between the actuators and the shaft.

Abstract: A circuit is illustrated for eliminating a repetitiously occurring or constant frequency pulse signal from a train of signal pulses. The design is such that a plurality of such circuits can be connected in series to eliminate several of various frequency repetitious pulse signals, leaving only asynchronous signals in the pulse stream presented to downstream circuitry. The concept used is to record the time between two pulses and delete the passage of any signal during a time subsequent to the second of the two pulses by an amount equal to the difference between the first two pulses. If a pulse is detected during that time window, the circuit continues to blank out the passage of pulses for as long as a pulse is detected during the time window.

Abstract: A self-timed bus arbitration and digital data transfer system is provided for a computer network having multiple master and slave devices sharing a digital data bus. Each master device includes a bus arbitration logic circuit having a time delay element. Each master contending for access to the data bus outputs an identifier on signal lines connecting the master devices. After a period of time comprising the slowest master's operational delay, the bus arbitration circuits determine, on a prioritized basis, which particular master shall have access to the data bus at that time. Upon gaining access, the particular master provides a request signal on a control line connecting the master and slave devices and provides an address on an address bus that may be multiplexed with the data bus. After each slave has decoded the address, as determined by the slowest slave's delay, an acknowledge signal is provided on the control line to the particular master so that data transfer may proceed to/from the selected slave.

Abstract: In the present invention Stress-Free Chemo-Mechanical Polishing Agent For II-VI Compound Semiconductor Single Crystals And Method Of Polishing, a II-VI compound semiconductor single crystal wafer is polished smooth to within 50 angstroms by using a mixture of water, colloidal silica and bleach including sodium hypochlorite applied under time and pressure control to achieve chemo-mechanical polishing. Many such compound crystals are not susceptible to polishing by prior art methods.

Abstract: A precipitation hardening, high strength alloy, characterized by a low, controlled co efficient of thermal expansion and resistance to hydrogen environment embrittlement.

Abstract: The compound 7-amino-4,6-dinitrobenzofuroxan is prepared by reacting 2,3,4,6-tetranitroaniline in a solvent with aqueous sodium azide under controlled exotherm conditions.

Abstract: Actuators of rigid electrically actuatable material provide articulation for robotic limbs. Piezoelectric actuators, for example, may be used in various embodiments of robotic joints to rotate a cylindrical or spherical connection or to translate a rod. Opposing pairs of actuators engage in smooth walking motion and maintain a vise-like grip on the robot limb at all times. The traction surfaces of the actuators contact the robot limb with zero clearance. Unlike the use of conventional bearings, zero clearance and full area contact provide relatively large mechanical stiffness that allows very precise positioning of robot limbs without mechanical oscillations of the extremities. With adequate limb rigidity, slop is essentially eliminated from the joints. The smooth walking motion of the actuators achieves high mechanical efficiency by eliminating sliding friction. The joints operate in air or space vacuum without lubrication and with negligible heating.

Abstract: The Dual Function Radar Receiver shown provides hardware commonality between detection and tracking modes. Four channels (56, 58, 60, 62) are provided, each of which searches a separate range bin during the detection mode. During the tracking mode, one channel (56) continues to search a range bin, while the second channel (58) servos the range bin to the range of the detected object. The third channel (60) processes the azimuthal difference signal (94), and the fourth channel processes the elevational difference signal (110).

Abstract: A method and apparatus for drawing high quality lines on color matrix displays wherein a line segment is created by activating a series of linear elements substantially centered about the predetermined line segment position and providing for various intensities for each element, the notion of a pixel group is completely discarded and each individual display element is individually addressed and individually assigned an intensity depending upon the predetermined line segment to be displayed and the orientation of that line segment wherein the method comprises generating element intensity, position and line slope information for a given line segment; inverting and registering the element intensity information; centering an array of elements around the element position information; determining the color of elements in the array of elements; determining the proper intensity for each element in the array of elements in order to produce the predetermined position of the line; and providing the proper intensity for

Abstract: A method and apparatus are disclosed for manufacturing large Monolithic Microwave Integrated Circuit (MMIC) arrays. MMIC elements are manufactured on a substrate to form a MMIC module and first conductive vias are created in the substrate at locations corresponding to contact points for the MMIC. The MMIC module is then secured to a multi-layered ceramic backplate structure for physical rigidity and electrical interconnection. The MMIC module uses a conductive material, such as chrome, to fill or coat the vias to provide electrical contact with MMIC contact pads. Each layer of the multi-layered backplate structure has an electrical interconnection circuit or network formed thereon, and conductive vias extending through the layer at locations corresponding to preselected vias in adjacent layers and electrical contacts for MMIC modules.