Abstract:
An improved ignition system for a fin-stabilized, high intrusion projectile (10) comprises an elongated boom (14) and a hollow fin assembly (16) which extends rearwardly into an external cartridge case (28) containing a consumable containment bag (30) filled with granular propellant (34), and which fits slidably over a primer (54). The primer (54) comprises a stub flash tube (56) extending through the base (40) of the external cartridge case (28) and a long igniter cartridge (58) fitted within the axial bore of the stub flash tube (56). The outer walls of the igniter cartridge (58) are fabricated from a combustible material such as paper, and the interior of the igniter cartridge (58) is filled with strands of benite or a similar explosive. Both the stub flash tube (56) and the hub (17) of the fin assembly (16) are provided with a plurality of transverse drilled flash holes or openings (60) which permit the flame and hot gases from the benite or the like within the igniter cartridge (58) to spread to the granular propellant (34) in the outer cartridge.
Abstract:
Six gyros (131-136) and six accelerometers (141-146) are mounted to faces of a single sensor base member (10). The sensors are arranged such that their input axes all pass through a common centerpoint (CCP) and that the common centerpoint (CCP) is the center of gravity of the total assembly.
Abstract:
In the present invention, a multilayer stack of alternating layers of a metal and a dielectric is deposited directly onto the surface of an optical fiber that has been processed to remove the cladding from one side of the fiber. The multilayer metal-dielectric structure is constructed to give high birefringence and large differential attenuation for two orthogonal polarizations.
Abstract:
An armor-penetrating ammunition assembly with a multiple segment aluminum protective cap (26). The cap (26) is provided with a plurality of stiffening ribs (34, 34', 35, 35'), and torque resisting tabs (40, 40') which rest in one of the grooves (37, 37') defined by the ribs (34, 34'). Additional stiffening is provided by rolled stiffening portions (36, 36') at the trailing end (32) of cap (28) and by longitudinal ribs (38, 38') at the longitudinal edges of each segment (28, 28') of the cap (26). Attachment structure is provided for forming a fixed interconnection between each segment (28, 28') of the cap (26) and a corresponding portion (19, 19') of the sabot (18). Thus, each segment (28, 28') of the cap (26) remains attached to a corresponding sabot portion (19, 19') as each portion (19, 19') of the sabot (18) separates from the penetrator (12) at muzzle exit without disturbing the flight of the penetrator (12).
Abstract:
A digital logic circuit using Schottky diodes (22, 42, 44) as the nonlinear logic element, a single power supply (VDD) and an E/mode MESFET (40) as an inverter in the open drain configuration. Temperature compensation (190) of the threshold voltage of the E/mode FET (40) is provided. The circuit is particularly suited for use with a GaAs substrate.
Abstract:
A Vertical-Cavity Surface Emitting Laser (VCSEL) for producing a filamented light ouput. In a preferred embodiment, this is accomplished by providing a number of discrete objects that are positioned adjacent to or within one or both of the cladding mirrors, or within the active region itself. The discrete objects may alter the reflectance, current injection and/or gain of the VCSEL at corresponding discrete locations, thereby causing the filamented light output. Besides providing a filamented output, the VCSEL of the present invention operates at a low drive current, provides high performance, and occupies less physical area than a broad-area (wide aperture) VCSEL. Thus, the VCSEL of the present invention has a number of advantages provided by a conventional laser including speed, efficiency and power, but does not suffer from many of the disadvantages of high coherence. The utilization of speckle averaging within multi-mode fiber interconnections and CD-like spatial imaging applications are contemplated.
Abstract:
A rugged ultrasonic sensor is provided which is capable of detecting objects in very close proximity to the sensor. This close proximity detection includes the detection of objects which are immediately adjacent the sensor housing. Such close range operation is achieved by tailoring the transducer to operate at previously undesirable conditions, including low Q and high frequency. Such operating conditions allow the resonating characteristics of the transducer not to interfere with close range operation.
Abstract:
An amplifier which outputs a nonlinear function in response to a linear input. The nonlinear response is a piece-wise linear approximation. The circuit includes an op amp which outputs a ramping voltage and a series of stages which change the slope of the ramping voltage. As the output of the op amp reaches a particular breakpoint, an additional stage of the circuit is activated so as to change the slope of the output. The new line segment has a new slope such that the combination of all these stages approximates a nonlinear response.
Abstract:
A photoacoustic gas sensing system includes either separate lasers or an arrangement of emitters and filters, to provide infrared energy within at least two distinguishable frequency bandwidths, modulated at two or more associated and different modulating frequencies. The modulated energy signals illuminate a gas cell containing a mixture of gases that experience temperature and pressure fluctuations responsive to the radiant energy. An amplified microphone signal, produced responsive to the pressure fluctuations, is detected at the different modulation frequencies to provide two or more detector signals in digital form. These signals are processed in combination with predetermined constants derived by calibrating the system, to generate two or more concentration values corresponding to the individual gases involved. The system can utilize a photoacoustic cell with walls formed entirely of a polymer that is both gas-permeable and transparent to the infrared radiation. If desired, a temperature sensor and a pressure sensor near the cells provide respective signals based on ambient temperature and ambient pressure. These ambient condition signals are used to provide concentration measurements corrected for changes in ambient temperature and pressure, including pressure differences due to differences in elevation. Temperature and light sensors can be included to reduce temperature-dependent and time-dependent variations in sensor calibration.
Abstract:
A MOS transistor formed in a silicon on insulator structure includes a rectifying connection between a body portion and the source. The connection decreases the threshold voltage of the transistor and limits a difference in voltage between the body and source.