Abstract: A low cost dedicated hardware arrangement for reconstructing successive data frames from for example a commutated telemetry-communicated serial stream of digital and analog data, data which may be of unspecified words per data frame content. Encoding and detection of a word length synchronization signal within each data frame of the stream in accordance with the protocol of a commercially available telemetry encoder/transmitter apparatus is contemplated in the disclosed embodiment of the invention. The disclosed system is tailored for minimum communication protocol flexibility along with minimum fabrication and utilized space costs. Use in the spread spectrum telemetry environment and fabrication using dedicated logic array techniques are also contemplated. Military and non-military uses of the system are feasible including uses in medical environments.

Abstract: An enhancement mode periodic table group III-IV semiconductor field-effect transistor device is disclosed. The disclosed transistor includes single metallization for ohmic and Schottky barrier contacts, a permanent non photosensitive passivation layer (a layer which has also been used for masking purposes during fabrication of the transistor) and a gate element of small dimension and shaped cross section as needed to provide desirable microwave spectrum electrical characteristics. The transistor of the invention is fabricated from undoped semiconductor materials disposed in a layered wafer structure and selectively doped by ion implantation to achieve either a p-channel or an n-channel transistor. The semiconductor materials may include two, one or zero buffer layers in their layer structure. The disclosed transistor is of reduced fabrication cost, increased dimensional accuracy and state of the art electrical performance.

Abstract: A method for forming a transmission line arrangement providing control of signal losses through the use of conductor cross-sectional surface area-increasing and skin effect-considered bulbous additions to the rectangular conductor cross-sectional shape frequently used in semiconductor device transmission line conductors. The achieved transmission line is especially suited for use in radio frequency integrated circuit assemblies where it also includes a backplane member, encounters signals in the microwave and millimeter wavelength range and involves conductor dimensions measured in micrometers. Control of transmission line characteristic impedance at, for example, 50 ohms is disclosed as is use of semiconductor device-compatible materials and loss comparisons data.

Abstract: A microwave integrated circuit internal-node waveform probing arrangement using a portable ungrounded voltage sensing probe and a commercially available transition analyzer instrument are disclosed. Harmonic frequency and phase processing are accomplished on the probe sensed voltage waveforms from internal nodes of for example a C-band monolithic microwave integrated circuit (MMIC) power amplifier circuit device. The disclosed probing is applied to determining signal voltage and signal current flow waveforms for the MMIC device. Examples relating to use of the invention to analyze operation of microwave circuits and prevent premature device failures are included; these include variation of waveforms as a function of frequency, drive and measurement location in a device. The potential impact of the disclosed technique includes MMIC design verification, in-situ device model extraction, process diagnosis, and reliability assessment.

Abstract: A reluctance motor/generator system in which a winding failure event in one channel of a multiple channel multiple phased stator assembly is accommodated by removal of the failed winding from the reluctance motor/generator machine's electrical circuit using electrical switching and an acceptance of reduced machine output capability. This electrical switching also accomplishes a reversal of magnetic polarity in poles of one remaining normal channel of the machine. The magnetic polarity reversal as accomplished electrically largely excludes secondary magnetic flux from stator poles carrying the failed winding and its associated phase windings of the channel and thereby precludes electrical energy generation in the failure event pole. In the thus achieved channel-removed mode of machine operation, a different more elongated magnetic flux path through the machine rotor and stator elements becomes active and provides reduced but usable electrical output from the machine.

Abstract: A method for fabricating an enhancement mode periodic table group III-IV metal semiconductor metal field-effect transistor is described. The disclosed fabrication arrangement uses single metallization for ohmic and Schottky barrier contacts, employs initially undoped semiconductor materials--materials selectively doped in a disclosed processing step, employs a non-alloyed ohmic contact semiconductor layer and includes an inorganic dielectric material layer providing non photosensitive masking at plural points in the fabrication sequence along with permanent surface passivation. The invention uses a combined optical and electron beam lithographic process, the latter in small dimension gate areas. These attributes are combined to provide a field-effect transistor capable of microwave frequency use, of reduced fabrication cost, low electrical energy operating requirements increased dimensional accuracy and state of the art electrical performance. Fabricated device characteristics are also disclosed.

Abstract: A mechanical oscillator-based physical quantity measurement system is disclosed. The mechanical oscillator is coupled by optical signals to a source of oscillation-sustaining energy and this energy is also time-shared between oscillation sustenance and the generation of oscillation frequency-characterized optical output signals. Measurement of physical quantities including fluidic pressure, electrical current flow, physical acceleration and magnetic field strength is contemplated with the disclosed system.

Abstract: An explosive material-energized plasticized metal slug cutter for use within tubular cylinders, or pipe or similar structures-especially in buried or otherwise inaccessible locations is disclosed. The cutter includes explosive material initially disposed in a particular hourglass or dogbone shape and surrounded by a layer of explosive-plasticizable copper or similar material which becomes both heated to plasticity and imparted with kinetic energy upon explosive material detonation. The hourglass or dogbone shape of the explosive material provides focus or shaping of the copper metal into a confined slug pattern enabling a clean and relatively low expended-energy cutting of a surrounding tubular cylinder into axial segments. The cutter employs a cutting action inclusive of spalling at the outer surface of the cut tubing opposite the region of slug impact.

Abstract: A room temperature wet chemical digital etching technique for, gallium arsenide or other semiconductor material. Hydrogen peroxide and an acid are used in a two step etching cycle to remove the gallium arsenide in approximately 15 .ANG. limited increments. In the first step of the cycle, gallium arsenide is oxidized by, for example, 30% hydrogen peroxide to form an oxide layer that is diffusion limited to a thickness of, for example, 14-17 .ANG. for time periods from 15 seconds to 120 seconds. The second step of the cycle removes this oxide layer with an acid that does not attack unoxidized gallium arsenide. These steps are repeated in succession using new reactant materials and cleaning after each reactant (to prevent reactant contamination) until the desired etch depth is obtained. Experimental results are presented demonstrating the etch rate and process invariability with respect to hydrogen peroxide and acid exposure times.

Abstract: Process control for generating graded multilayer films repetitively and consistently using both pulsed laser sputtering and magnetron sputtering deposition techniques. The invention includes an apparatus which allows for set up of an ultrahigh vacuum in a vacuum chamber automatically, and then execution of a computer algorithm or "recipe" to generate desired films. Software operates and controls the apparatus and executes commands which control digital and analog signals which control instruments.

Abstract: An open loop control arrangement for an electrical energy flow-controlling circuit coupling the varying terminal voltage of an energy storing capacitor to a fixed voltage direct current aircraft energy supply bus in order to supplement bus voltage transients. The open loop control arrangement allows energy flow from the varying terminal voltage of the capacitor to the fixed bus voltage by providing a time varying pulse modulation cycle in an energy conveying and voltage changing inductive element located in the energy coupling path. The open loop control arrangement senses input voltage rather than output voltage of the coupling circuit in what is termed a "feed forward " output regulation algorithm. A transistorized and integrated circuit inclusive preferred embodiment of the invention is disclosed in which a disconnect of the inductance from the aircraft supply bus is accomplished during shunt path inductance energy charging portions of an operating cycle.

Abstract: A method for fabricating a periodic table group III-IV HEMT/pHEMT field-effect transistor device. The disclosed fabrication arrangement uses a single metalization for ohmic and Schottky barrier contacts, employs selective etching with a permanent etch stop layer, employs a non-alloyed ohmic contact semiconductor layer and includes a permanent non-photosensitive secondary mask element. The invention includes provisions for both an all optical lithographic process and a combined optical and electron beam lithographic process These concepts are combined to provide a field-effect transistor device of reduced fabrication cost, increased dimensional accuracy and state of the art electrical performance.

Abstract: A broadband gigahertz frequency range radio receiver useful in electronic warfare and other applications for incoming signal detection and identification purposes. The receiver is based on Fourier transform examination of incoming signal characteristics and provides real time accomplishment of these tasks by way of using a simplified one-bit digital representation of the incoming signals and a resulting reduction of the computational load associated with the Fourier transform operation. The receiver precedes the Fourier transform operation with signal processing which may include, for example, a limiting amplifier and two bandpass filters. Two incoming signal accommodation is provided, a characteristic which is particularly improved over the characteristics of popular presently used receivers in this field.

Abstract: A heat transfer-based surface flow visualization method and device that uses a temperature sensitive material to detect advection along a substrate upon application of heat and air flow and thereby provides a surface flow pattern. The present invention includes the capability of providing surface flow patterns for positions of flow separation, reversal of flow and transition flow and is non-intrusive and more cost effective than known methods.

Abstract: The present invention provides a realization of a real-time, high frequency Fourier transformation using a single binary-bit kernel function which reduces the mathematical operation mechanizations needed to generate a Fourier transformation from multiplication and associated dense, complex hardware to simple addition and subtraction associated hardware components. The single binary-bit kernel function Fourier transformation generated produces a constant peak amplitude regardless of the number of bits in the input data and is most useful for applications where input data is composed of 1 and 2 binary bits.

Abstract: An aircraft electrical energy supply bus supplementing arrangement based on large capacitor or super capacitor storage of electrical energy for bus supplementation. Supplying of bus energy to the large capacitor is addressed in the invention. In this supplying energy is removed from the aircraft bus during quiescent conditions under the control of a energy coupling circuit which has a plurality of different energy removal rates, rates which are selected in response to the yet needed amount of capacitor charging and in a time-constant-controlled manner. Feedback control of this charging time constant selection is employed along with passive electrical device dissipation of major fractions of the time constant apparatus energy losses.

Abstract: A computer implemented method and system for preparing a description of an electromagnetic scattering net approximating an actual scattering net for analyzing effect on sensor imagery is comprised of: (1) inputting a basic tent configuration comprising a number of tent poles, spacing of tent poles, a covering net, an amount of net sag, and plurality of locations of ground anchor points, representing the design variables selected by an operator from which a net can be modeled; (2) dividing the overall net shape into a plurality of large facets that describe the overall shape conforming to the basic net configuration; (3) subdividing each large facet into a plurality of small facets in accordance with the input number of small facets per large facets chosen so that the small facets correspond in wavelength to the scattering of an actual scattering net; (5) rotating each small facet to achieve an approximation of the signature reduction of an actual scattering net; and (6) outputting a description of rotated sma

Abstract: A cooling arrangement for a high speed open rotor reluctance motor/generator apparatus of the type finding combination use in aircraft applications for engine starting and electrical energy generation in both normal and auxiliary power unit operating conditions. The cooling arrangement identifies fluid flow alternatives which include inlet region redirection of coolant fluid to improve its induction into rotor interpolar space, rotor movement-induced centrifugal pressurizing of coolant using simple and more complex structural elements, machine heating of the coolant fluid, kinetic energy extraction from heated moving coolant fluid and combinations of these arrangements in particular machine configurations. Use of the invention under extremes of machine energy levels and self heating in military and commercial aircraft environments are contemplated.

Abstract: An improved intracavity sensor based output power control for microcavity light emitting devices. An improved phototransistor transducer is both configured and physically disposed so that it passively transmits the spurious optical energy output of the microcavity light emitting device while simultaneously generating a light determined electrical signal of easily used large magnitude that is nearly free of error. The base-collector region of the transistor is disposed with a quantum well absorbing layer and produces a signal responsive to a selected emission wavelength. The configuration of the optical energy communicating transducer is arranged so that it is improved in sensitivity and especially in selectivity in generating the laser feedback signal.

Abstract: A commercially attractive arrangement for monolithic integration of a nonlinear optical polymer transverse electro-optic device for high data rate optical signals on an electronic integrated circuit chip. The invention provides for conductive polymer sheet layers immediately adjacent to an optical signal transmitting nonlinear optical polymer core layer. Electrically passive polymer cladding layers are also provided adjacent to the conductive polymer sheet layers to achieve lower optical signal losses. The combination provides a reduced nonlinear optical polymer core layer poling voltage, reduced device length, and 5 VDC or less controlling voltage, allowing inclusion into electronic integrated circuit chips of a size compatible with multichip module integration.