Abstract: An infrared image is directed onto a transducer having a planar array of absorbing discs, on one side. The discs are supported by a thin membrane which sags or bulges as the discs heat up. The discs thus change their spacings with respect to a partially reflective mirror. The nominal spacing between the discs and mirror is about ¼ wave-length of the infrared radiation, such that absorption is enhanced. The mirror is supported on a transparent substrate through which visible or near-infrared radiation is shown; the mirror/discs thus establish a Fabry-Perot cavity for this radiation, whereby a visible or near-infrared image may be observed or detected as the various discs establish various spacings in accordance with incremental variations in the infrared image. An alternate embodiment uses an electrostatic field to pre-bias the discs toward the mirror and thus to tune or adjuct the sensitivity of the transducer.

Abstract: Two Fabry-Perot interference filters are used as tandum polarizers for a h-power laser beam counter measure in an optical scene. The scene radiation is directed on one polarizer; one plane of polarization of the laser beam is transmitted thereby and the other scene radiation is reflected to the other polarizer. The other polarizer transmits the other plane of polarization of the laser beam and reflects the other scene radiation to a photodetector, such as an image intensifier, infrared imager, television camera tube, or a human eye. The laser beam transmitted by the polarizers is trapped by absorbers and cannot harm the photodetector.

Abstract: In order to protect a delicate photo-detector from high-intensity optical radiation such as from a laser, a device for limiting power to the detector is interposed between the radiation and detector. This device has two embodiments and is made such that high-intensity radiation is totally reflected. In the absence of high-intensity radiation, total reflection is frustrated, and desired radiation passes to the detector. Both embodiments use two prisms with parallel surfaces skewed to incident radiation and with a slightly absorbant optical material between the surfaces. Desired radiation normally passes through the prisms and the material to the detector. In one embodiment, the material is a liquid which vaporizes in response to high-intensity radiation, and in the other embodiment, the material expands and pushes the prisms apart. In either case, transmission of radiation halts, and the radiation is totally reflected by a prism skewed surface.

Abstract: A grenade device for use with and for ejection from an artillery shell is ovided. The device includes a stabilizing propeller and a grenade body. The propeller has two opposite blades disposed on opposite sides of a rotation axis. Each blade has an upper tilted portion and a lower substantially flat portion and a connecting return bend tip portion. Each such portion has a leading edge and a trailing edge. Each upper tilted portion has a transverse angle of attack. The upper tilted portions have a common longitudinal upper projected axis. The lower flat portions also have a common longitudinal lower projected axis. The common longitudinal upper projected axis and the common longitudinal lower projected axis form a projected displacement angle therebetween. The propeller is made from a flexible metal or fabric ribbon. The blades are folded in a nested arrangement before descent. During descent, the blades unfold to their overall aerodynamic shape. The propeller has a windmill type of rotation during descent.

Abstract: A high explosive assembly and a method are disclosed for projecting a long od at high velocity with enhanced penetrating energy. The high explosive assembly has an elongated core of a first high explosive having a first Chapman-Jouguet detonation velocity, an elongated liner positioned substantially along the longitudinal axis of the core, and an elongated jacket of a second high explosive encasing the core and having a second Chapman-Jouguet detonation velocity greater than the core Chapman-Jouguet detonation velocity. The jacket high explosive, upon detonation, continuously initiates detonation of the core high explosive by an imposed oblique detonation front which converges toward the center of the detonating core with time, until a trailing mach stem emerges therefrom as detonation progresses.

Abstract: A round or cycle counter for a weapon which utilizes a wear member operatively attached to the surface of a moving member which slidingly contacts a surface of a non-moving member of the weapon. A visual change in the wear means size or wear pattern enables one to calibrate the number of rounds fired or the safe life limit.

Abstract: A breech mechanism embodies a multi-lug sliding breech block having a pluity of pairs of lugs. At the instant before firing, the bearing surfaces of at least one pair of lugs are spaced a predetermined distance apart from the bearing surfaces of the respective threads, or lugs, of the breech ring. When the cannon is fired, a reactive force acting on the breech block elastically deforms the material of the ring and block, forcing all the bearing surfaces into an abutting contact relationship whereby the stresses produced within the material of the mechanism are more uniformly distributed throughout the breech ring and the breech block thereby increasing the service life of the mechanism.

Abstract: The invention discloses an improved conventional munition employing a dual omblet configuration including dual shaped charges and a design which uses a Misznay-Schardin end plate with a shaped charge. Both bomblets are separately enclosed by fragmenting warheads that are positioned in tandem. the tandem bomblet design results in a nesting arrangement of the fragmenting warhead, or sub-munition, to produce maximum packaging efficiency. A forward sub-munition of a tandem bomblet will nest within a cavity of a shaped charge of an aft sub-munition.

Abstract: A grenade device for use with and for ejection from an artillery shell is ovided. The device includes a stabilizing propeller and a grenade body. The propeller has two opposite blades disposed on opposite sides of a rotation axis. Each blade has an upper tilted portion and a lower substantially flat portion and a connecting return bend tip portion. Each such portion has a leading edge and a trailing edge. Each upper tilted portion has a transverse angle of attack. The upper tilted portions bave a common longitudinal upper projected axis. The lower flat portions also have a common longitudinal lower projected axis. The common longitudinal upper projected axis and the common longitudinal lower projected axis form a projected displacement angle therebetween. The propeller is made from a flexible metal or fabric ribbon. The blades are folded in a nested arrangement before descent. During descent, the blades unfold to their overall aerodynamic shape. The propeller has a windmill type of rotation during descent.

Abstract: A composite material comprising a metal matrix containing tungsten grain is roduced from tungsten powders formed by plasma rapid solidification. The powders comprise tungsten and up to 20 weight percent of a metal selected from the group consisting of molybdenum, tantalum, niobium, rhenium, and chromium. The surfaces of the powders are cleaned to reduce the surface oxide thereon, and the powders are coated with at least one metal selected from the group consisting of copper, nickel, cobalt, hafnium and tantalum. The coated powders are formed into a sintered preform which is less than fully dense, and the sintered preform is further consolidated to full density by a technique selected from hot isostatic pressing, rapid omin-directional compaction, and hot extrusion.

Abstract: A method for the measurement of mass spectra by three dimensional quadrup fields (QUISTORs) is presented, in which the ions are mass-to-charge selectively ejected by a selected nonlinear resonance effect in an inharmonic QUISTOR. In order to enhance scan speed and mass resolution, the ejection of a single kind of ions can be confined to a very small time interval, either by the generation of ions within a small volume outside the field center, or by an excitation of the secular amplitudes by an additional RF voltage across the end electrodes, shortly before the ions encounter the sum resonance condition. An instrument for this method is described.

Abstract: A process for denitrating the dinitrate ester of diethyleneglycol is disced which comprises introducing the dinitrate ester of diethyleneglycol into an aqueous phosphate buffer containing the tripeptide reduced glutathione and the enzyme glutathione S-transferase.

Abstract: A sighting structure for a weapon such as a rifle, which can hold its alignment to precision, despite repeated recoil of the weapon, is disclosed. The sighting structure is suspended in an elastomer, within a housing, and the sight alignment can be adjusted from outside the housing over two planes by vertical and horizontal set screws. The housing also serves to protect what might be a delicate instrument sight from the elements, by the possibility of enclosing it within the housing, and also providing transparent or opaque end pieces for the housing.

Abstract: A back-up electrical safety device for a land mine is presented which proes an additional 50 to 60 second time delay concurrent with the conventional built-in one minute delay before any detonation is possible. A soldier is therefore afforded an additional assurance of an ear one minute time lag before an accidental explosion could be possible due to premature pulsing of the mines's built-in timer. A Darlington pair RC switching circuit appears electrically in tandem between the internal timer and the various arming means, to doubly insure an approximate one minute override before detonation. This dual safety feature permits hand-emplacement, over gun-launching, of a conventional land mine.

Abstract: In a quadrupole ion store (QUISTOR), a sample is analyzed by increasing the mplitude of the harmonic, or "secular", oscillations of selected stably trapped ions so that they leave the trapping field. In a preferred embodiment, deviations from the ideal electrode geometry are incorporated into the QUISTOR to produce resonance phenomena between the r and z secular oscillations, thereby increasing the amplitude of oscillations in the z direction.

Abstract: A solar reference flight roll position sensor is mounted on a flight vehi having a longitudinal flight axis. The sensor, a photodetector, senses the angular position of the vehicle with respect to the sun about the flight axis. The sensor includes a lateral effect photodiode for generating first and second photocurrents in response to the position of a beam of sunlight illuminating the active surface of the photodetector. An opaque screen having an aperture is superimposed above the surface of the photodetector such that a different section of the surface is illuminated by sunlight passing through the aperture for different roll angles of the vehicle. The photocurrents are processed to form a discriminant that is a function of roll position. Roll rate is determined by measuring the rate of change of the roll position.

Abstract: A system for controlling solid propellant gas generators including a microcessor which has inputs such as the sensed temperature of the gases in the solid propellant gas generator, the pressure within the solid propellant gas generator and/or pre-programmed input control signals to the microprocessor for causing the microprocessor to produce signals that are used to control a modulation valve which in turn controls a thrust nozzle device that controls exhaust gases from the solid propellant gas generator.

Abstract: A tracer training bullet which can be assembled into a conventional cartre case and fired in a conventional M2 machine gun is disclosed. The bullet consists of a main body of relatively low strength material which is segmented so that, if not restrained, it will bend under the centrifugal rotational force imparted to the segments by the spinning action of the projectile when fired. The bending of the projectile segments away from their central axis is ordinarily prevented by a retainer in the form of a spider. The spider is made of a relatively low temperature melting material, preferably aluminum, having a given thermal mass. The burn of the tracer material during the flight of the bullet toward a target weakens the retainer to the point of rupture after the bullet has travelled a given distance toward a target position. After the target position is passed, the securement member is destroyed by the high temperature burning action and the segments of the projectile bend or flex apart.

Abstract: A method for casting a rotating band onto a projectile having a metallic ll, with a nose at one end, a closed base at the other end, and a hollow core axially formed within said shell. The method comprises the steps of (a) forming a projectile mold having three sections, a first section for the nose, a second section for the closed base, and a third section for the rotating band seat; (b) casting hot metal into the mold; (c) removing the mold from the third section so as to expose the rotating band seat therein; (d) clamping a ring mold about the rotating band seat; (e) casting hot metal into the ring mold to form a rotating band within and above the rotating band seat; and (f) cooling the projectile.

Abstract: An apparatus which produces an aerosol having a narrow size distribution. e apparatus includes a supply means for providing a primary aerosol stream having a wide size distribution. Concentration means are positioned to receive the stream and this concentration means includes means for reducing volume flow rate without disregarding a proportionate fraction of the particles to provide a reduced flow rate stream. Venturi means are provided to monitor the stream and transfer the stream. Impactor means are provided for receiving the stream and introducing a core of clean air into the center of the stream. Means are provided for adjusting the relative velocities of the stream and the core to exclude particles having an inertia below a predetermined size, thereby eliminating smaller particles. Outlet impactor means are positioned to receive the stream and the core, for removing particles larger than a predetermined size.