Abstract: An electromagnetic transducer is provided for ultrasonically inspecting conductive material as the material moves relative to the transducer. A coil is positioned in the field created by a magnet so that the conductors of the coil are transverse to the magnetic field. The coil is located predominately near the leading side of the magnet where flux is concentrated as the magnet and material move toward each other.

Abstract: A method and generator are provided for producing singlet molecular oxygen, O.sub.2 (.sup.1 .DELTA..sub.g). A hypohalite selected from the group consisting of BrSO.sub.3 F, BrNO.sub.3, BrOCF.sub.3, ClSO.sub.3 F, ClNO.sub.3, Cl0CF.sub.3, FSO.sub.3 F, FOCF.sub.3, and ISO.sub.3 F, is reacted with hydrogen peroxide to produce singlet molecular oxygen. A preferred embodiment of the reaction is illustrated by the following example:ClSO.sub.3 F + H.sub.2 O.sub.2 .fwdarw. O.sub.2 (.sup.1 .DELTA..sub.g) + HSO.sub.3 F + HCl.The generator for producing the singlet molecular oxygen is a reactor vessel having nozzles for introducing the chlorine fluorosulfate and hydrogen peroxide into the vessel. An outlet is provided for withdrawing the products, and the singlet molecular oxygen is separated by condensing out the other products in a condensor.

Abstract: A method of producing NF.sub.4 PF.sub.6 by ultraviolet photolysis at -196.degree. C of a mixture of NF.sub.3, F.sub.2 and PF.sub.5.

Abstract: Strong Lewis acids added to wet HF protonate the water to form stable OH.sub.3.sup.+ salts.

Abstract: A timing signal generator operates in response to engine position sensors to generate pulse signals in sequence, the leading edge of each of said pulses essentially coinciding with the valve opening time of an associated one of the cylinders of an internal combustion engine. The outputs of the timing signal generator are fed to a control signal generator which generates a series of pulses, one for each of the engine cylinders, the leading edges of these pulses each approximately coinciding with the leading edge of a corresponding one of the timing signal generator outputs. The pulse widths of the outputs of the control signal generator, which are controlled in accordance with various engine parameters, are indicative of engine fuel requirements for optimum engine efficiency and/or minimum emission of pollutants.

Abstract: In a laser gyro, laser optics adjustment means comprising a mirror within the laser optics of the gyro and mounted upon a three-terminal duo-mode bimorph device for duo-mode modulation of the laser optics. A two-stage differential amplifier is responsively coupled to a source of two mutually phase-coded reference signals for separately dithering each mode of the duo-mode bimorph device, each stage being further responsive to a mutually exclusive one of a first and second synchronously detected photodetector output of the laser gyro whereby closed loop control of the laser optics is effected.

Abstract: A dual balanced mixer frequency converter is disclosed which provides a low conversion loss by reactively terminating one of the leads on a combiner circuit such that all the image frequency signal power and/or part of the reflected receiver power is returned to the mixer. If this termination appears reactive at the image frequency response looking out from the mixer diode terminals, it will also reduce the noise appearing in the IF output signal.

Abstract: A forward observer directs a pulsed neodymium laser illuminator in the direction of a target to be marked. A detector-receiver which is fixedly mounted to an attacking aircraft detects the reflected laser energy and determines its direction of incidence. Four indicator lights are projected onto a conventional gunsight combining plate together with a crosshair reticle. The lights provide the pilot with steering signals which will permit him to aline the crosshairs and the target.

Abstract: In a multi-element array of laser oscillators, each having a control input for adjusting the output laser light frequency thereof, apparatus for phase and frequency locking each laser oscillator of the array to a reference laser oscillator. An optical phase shifter cooperates with the reference laser oscillator and with a radio frequency source to provide a local oscillator energy source. Mixing of the local oscillator energy with that of a respective one of the array oscillators by photodetector and then phase detection of the mixed or down-converted signals, relative to the radio frequency source, provides a control signal for phase and frequency control of the array oscillator.

Abstract: A method and device which are suitable for the in-place inspection of pipelines are provided. A completely self-contained, mobile inspection station is placed inside a pipeline. The station runs through the pipe and transmits Lamb waves within the pipe wall, receives reflected and transmitted portions of the waves, and records the amplitude and phase of the received waves. The recorded information is analyzed to determine the location and nature of discontinuities in the pipe.

Abstract: A solid propellant gas generator consisting of 45-65 weight percent calcium oxide, 25-45 weight percent calcium azide, and 8-11 weight percent calcium nitrate which produces pure nitrogen gas at temperatures above 2200.degree. K in the complete absence of other gaseous products and metallic vapors.

Abstract: A redundant channel control system includes one or more voters having a high-pass filter connected between a pair of voter inputs.

Abstract: Dinitrocyanoalkyl epoxides having the general formula: ##STR1## wherein R is a lower alkylene radical containing from 1 through 5 carbon atoms and n is 0 or 1.

Abstract: A digital weather radar system having a mode that clears the display of all clutter and lighter precipitation to reveal or positively present only the contoured areas, i.e., the severe "cores" or "hard spots." Data representative of the searched space is stored at least temporarily in a digital memory. In the preferred embodiment, a controllable decoder operates on this data according to the particular decoder state selected, the decoder output is D/A converted, and the resultant analog signal is used to intensity modulate a cathode ray tube (CRT).

Abstract: A method is provided for imparting a fine grain structure to aluminum alloys which have precipitating constituents. The alloy is first heated to a solid solution temperature to dissolve the precipitating constituents in the alloy. The alloy is then cooled, preferably by water quenching, to below the solution temperature and then overaged to form precipitates by heating it above the precipitation hardening temperature for the alloy but below its solution treating temperature. Strain energy is introduced into the alloy by plastically deforming it at or below the overaging temperature used. The alloy is then subsequently held at a recrystallization temperature so that the new grains are nucleated by the overaged precipitates and the development of these grains results in a fine grain structure.

Abstract: An air erected gyro includes an erection-force producing air stream and gravity-responsive valve means whose gate portion is movable across the air stream so as to vary the erection force magnitude. Also included is a compensator means connected for movement with the gate and for also confronting the air stream so as to at least partially counteract air stream induced horizontal coercive effects on the valve means position.

Abstract: A postdetection, digital radar signal processor for producing information for a PPI type display on a conventional CRT. Each line of the polar or PPI type display represents a summing of past and present returns received at substantially the same antenna position during past and present antenna scans. SUThis invention relates to electronics and more particularly to digital processors for use with radar systems.Storage tubes, or electrostatic memory tubes, are widely used for radar indicators. The information painted thereon is retained by electric charges and thus such tubes can provide to the operator a continuous map of the system observed space. However, storage tubes are expensive, unstable, and have limited dynamic range. They also require critical adjustments.Previous attempts to replace the storage tube in airborne weather radar applications with a conventional CRT (cathode ray tube) and digital memory have had some success and also some shortcomings.

Abstract: The method of designing a circuit having a substantially constant delay over a given frequency band and having a substantially linear attenuation characteristic or amplitude change characteristic over the same frequency band and the product resulting from such a design approach. One such approach uses a primary tank circuit having a given Q and amplitude response feeding two secondary tank circuits each of which have a higher Q and amplitude response and wherein the resonant points are on either side of the resonant point of the primary tank. By adjusting the Q, amplitude response and resonant frequency of the three tanks, the "delayless" and linear amplitude change characteristics over a given frequency band can be achieved.

Abstract: A nitrile-containing material is bonded to the surface of a rubber substrate in order to increase the wettability of the surface. A rubber substrate is placed in the afterglow region of an electrodeless glow-discharge chamber. A nitrile-containing material such as an acrylonitrile monomer is introduced into the chamber, causing the monomer to polymerize and bond to the surface of the rubber substrate. In one embodiment, the surface of the rubber is etched with sulfuric acid prior to bonding the nitrile-containing material to the surface.

Abstract: An amplitude modulation (AM) removal circuit comprising a phaselock loop. A phaselock VOR receiver includes said AM removal circuit.