Abstract: A circuit for providing a scaled sinusoidal voltage proportional to a sinusoidal current referenced to a first reference potential. The scaled sinusoidal voltage is referenced to a second reference potential. A scaling resistor is connected between an operational amplifier inverting input terminal and the operational amplifier output terminal. A transformer has a primary winding in series with the sinusoidal current. A secondary winding has a first terminal coupled to the second reference potential and a second terminal coupled to the operational amplifier inverting input terminal. An integrator has an inverting input terminal coupled to the operational amplifier output terminal, a noninverting input terminal coupled to the second reference potential and an output terminal coupled to the operational amplifier noninverting input terminal.

Abstract: A phase locked passive ring resonator gyroscope comprising a fixed frequency reference signal generator (Fm); a single piece body having laser and passive resonator cavities; a laser means using the laser resonator cavity responsive to a laser control signal from a laser servo for providing a single frequency light source (F0) for frequency modulating the single frequency light source to form a light source (F0) and having respective upper and lower side bands at frequencies F0+Fm and at F0-Fm; first and second voltage controlled oscillator means responsive to respective first and second control signal for frequency shifting the first and second frequency modulated ray center frequencies by a first and second variable offset frequencies to form a propagating and counterpropagating light sources; the second resonator cavity being a passive high Q evacuated cavity; a detector means for detecting a first offset frequency error signal and for detecting a second offset frequency error signal; cavity servo means re

Abstract: A laser accelerometer comprises a frame having three orthogonal input axes and multiple proof masses, each proof mass having a predetermined blanking surface. A flexible beam supports each proof mass. The flexible beam permits movement of the proof mass on the input axis. A laser light source provides a light ray. The laser source is characterized to have a transverse field characteristic having a central null intensity region. A mirror transmits a ray of light to a detector. The detector is positioned to be centered to the light ray and responds to the transmitted light ray intensity to provide an intensity signal. The intensity signal is characterized to have a magnitude related to the intensity of the transmitted light ray. The proof mass blanking surface is centrally positioned within and normal to the light ray null intensity region to provide increased blanking of the light ray in response to transverse movement of the mass on the input axis.

Abstract: A superconducting electromagnet comprising an outer core having an aperture; an inner core having a periphery characterized for complementary insertion into the outer core aperture leaving a uniform gap therebetween and a frame means for coupling the outer and inner cores into a fixed position relation. A magnetizing means, such as a coil on the inner core develops an initial flux field. The flux field passes through the inner core, the first gap, the outer core, across the second gap to the inner core in response to excitation of the magnetizing means. The outer and inner cores are coated on all surfaces except opposing inner and outer core gap surfaces with superconductive material. The superconductive material is applied to the outer and inner cores at regions selected to pass induced magnetizing current. The induced magnetizing current circulating via closed current paths within the superconductive material to support the flux free of energy loss on termination of excitation of the magnetizing means.

Abstract: Windings for magnetic core devices are preformed as a flat conducting strip disposed in a helical coil configuration of circular shape, having elongated tabs at selectible angles to the coil from substantially tangential to substantially radial orientation for cooperation with the magnetic core exit slots, thereby maximizing core window utilization and adapting to conventional cores. The cross sectional area of the tabs may be substantially less than the cross sectional area of helix turns thereby further eliminating interference with smaller core exit slots. A plurality of such windings are stacked, one on top of the other, or interleaved or placed on torroidal core with flexible orientation of the tabs being available to facilitate access to each of multiple terminals and to isolate or group electrical functions.

Abstract: A demultiplexer circuit responsive to a composite input signal from a sonobouy. The invention circuit has a filter and comparator means responsive to the composite signal for providing a filtered frequency pilot reference signal. The filtered frequency pilot reference signal has a frequency equal to one half the frequency of a reference carrier signal in the composite signal. The invention circuit has a sine demodulator means responsive to the composite signal and to an east/west demodulator signal for providing an east referenced output signal. A cosine demodulator means is responsive to the composite signal and to a north/south demodulator signal for providing a demodulated phase pilot signal and the north referenced output signal. A north/south filter means is responsive to the output signals from the cosine demodulator means for filtering the demodulated phase pilot signal to provide the north referenced output signal.

Abstract: A demultiplexer test circuit having a signal source summing means responsive to a selected target angle theta for adding a first independent noise signal to an input signal to provide a composite omni signal and for adding a second noise signal to the product of the cosine of the selected target angle and the input signal to provide a composite cosine signal, and for adding a third noise signal to the product of the sine of the selected target angle and the input signal to provide a composite sine signal. A dual output phase shifting means responsive to a selected heading angle phi provides a quad count signal, a quad count clock signal, a reference count signal and a reference count clock signal. The reference count signal is lags the quad count signal by a time interval proportional to the selected heading angle phi.

Abstract: A frequency synthesizer for use by an operator or other means for continuously generating an output noise signal, the frequency synthesizer comprises a digital means for directly synthesizing random noise having controlled spectral amplitudes. The synthesized random noise is characterized by a series of digital composite frequency synthesizer output noise signal sample values. The digital means comprises a means for providing and for periodically changing a series of sets of shifted segment frequency values, each set of shifted segment frequency values having a controlled series of random frequency values. Each frequency value is a random digital number selected to be within a range corresponding to a segment frequency band and characterizes a shifted segment frequency value. A plurality of digital oscillators is included, each oscillator having a corresponding segment frequency band.

Abstract: A winding for a magnetic core is preformed as a flat conducting strip disposed in a helical coil configuration of circular shape, having elongated integral tabs at selectible angles to the coil from substantially tangential to substantially radial orientation for cooperation with the magnetic core exit slots, thereby maximizing core window utilization and adapting to conventional cores. The cross sectional area of the tabs is less than the cross sectional area of helix turns thereby further eliminating interference with smaller core exit slots.

Abstract: A passive ring resonator gyroscope comprising a single piece body having an integral first and second resonator cavity. The first resonator cavity contains a single frequency laser means to provide a sharply tuned single frequency light source to the second resonator cavity. The single frequency light source is sharply tuned and is split to form first and second sources. The second resonator cavity is a passive high Q cavity having a closed second optical path. The two light sources are fed to the second resonator and propagate as CW and CCW beams within the second resonator. A first servo channel tunes the frequency of the CW beam to a resonance peak. A second servo channel tunes the CCW beam to its resonance peak. By converting both servo error outputs into frequency, the relative frequency difference between the CW and CCW beams are recorded as the frequency shift in response to the body rate rotation about the sensitive axis.

Abstract: An apparatus and method for performing liquid phase epitaxy, mercury containment, substrate leveling, in situ annealing/doping and gas flushing in a liquid phase epitaxy growth of HgCdTe. The apparatus is a self contained unit comprising a transparent cover for providing access to the interior of the apparatus and for forming a gas impermeable seal between the apparatus and the cover. The apparatus also contains a leveling apparatus, a gas flushing apparatus, and an apparatus for the in situ doping/quench annealing of HgCdTe epitaxial films. The leveling apparatus comprising channels and leveling balls that travel therein which align themselves between scribe marks when the apparatus is in a level position. The gas flushing apparatus is comprised of a gaseous purge ball valve that opens and seals a flushing channel that lead from the interior of the invention to the external environment.

Abstract: A countermeasure method and apparatus for use by two mutually cooperating aircraft against a radar-homing anti-aircraft missile, and including the steps of transferring doppler shifted radar signals received at a respective one to the other of the two mutually cooperating aircraft, and retransmitting the transferred radar signals toward the homing missile, thus simulating a target having the doppler characteristics of each of the two aircraft and further having a centroid located between the two aircraft.

Abstract: A passive ring resonator gyroscope having an integral single piece body having first and second resonator cavities. A laser uses the first resonator cavity. The laser has a first cavity adjusting means (PZT1) responsive to a first control signal for providing a single frequency light source (F0). The second resonator cavity is a passive high Q evacuated cavity having a closed optical path tuned to resonate at substantially the light frequency of the first resonator cavity. A modulating means modulates the single frequency light source to form a frequency modulated light source having a center frequency equal to the single frequency light source (F0) and having upper and lower side bands at frequencies Fo+Fm and at F0-Fm, respectively. The frequency modulated light source is split into respective first and second frequency modulated rays. The first ray center frequency is shifted by a fixed offset frequency (F1) to form a propagating light beam (FCW) in the second resonator cavity.

Abstract: The invention comprises apparatus for forming nelical coils from conductive strip metal, counting the turns and cutting them to separate the turns into coils of desired numbers of turns, annealing the coils, tabbing the ends thereof, coating the coils with insulative coating and curing the coating by baking; compressing the so-insulated coils under extreme pressure to comprise a helical coil product, per se, or to fit conventional cores to comprise an inductor product.

Abstract: Windings for magnetic core devices are preformed as a flat conducting strip disposed in a helical coil configuration of circular shape, having elongated tabs at selectible angles to the coil from substantially tangential to substantially radial orientation for cooperation with the magnetic core exit slots, thereby maximizing core window utilization and adapting to conventional cores. The cross sectional area of the tabs may be substantially less than the cross sectional area of helix turns thereby further eliminating interference with smaller core exit slots. A plurality of such windings are stacked, one on top of the other, or interleaved or placed on torroidal core with flexible orientation of the tabs being available to facilitate access to each of multiple terminals and to isolate or group electrical functions.

Abstract: A multi-mode force control apparatus and circuit for applying a predetermined time dependent force to a workpiece having a variable compliance. The workpiece is supported by an anvil and an actuator is used for applying force to the workpiece. The multi-mode force control apparatus has a position mode sequence that provides a composite position command signal characterizing the predetermined time dependent position of the hammer. A position servo amplifier provides an input control signal to move the hammer from a retracted position to a predetermined first position close to the workpiece. The hammer is then moved slowly into contact with the workpiece. A force reference command signal representing the predetermined time dependent force is increased to a predetermined value. A force signal from a force transducer then rises to a value of voltage representing an ultimate actual force value. A force hold mode timing sequence provides a force hold mode time interval.

Abstract: A high-speed distributed-arithmetic realization of a second-order normal-form digital filter includes a filter input, a filter output, and a memory. The memory has a first input, a second input, and a third input. The first memory input is connected to the filter input. The memory also has a first output, a second output, and a third output. The digital filter additionally includes a first adder having an input connected to the first memory output, and having its output connected to the filter output. A second adder has an input connected to the second memory output, and has its output connected to the second memory input. A third adder has an input connected to the third memory output and has its output connected to the third memory input.

Abstract: A signal processor suitable for use as a discrete-time or sampled-data analog filter can be implemented by using only a few of the coefficient multipliers of a typical analog finite-impulse-response (FIR) filter, and expressing each coefficient multiplier as a multibit digital word. Each bit of the multibit word is formulated as a tap weight coupled to a delay element of an input-delay line. Factor elements are coupled to the outputs of the bit-tap-weights to multiply the outputs of those bit-tap-weights by factors representative of the significance of the bit represented by that weight. Bit-tap weight outputs from tabs that were lens delayed on the input line are delayed upon output so the outputs of all the bit-tap weights associated with a single multibit word are combined together to form a single output. The output signal is interpolated in an interpolator to recover the information lost by omitting some of the coefficient multipliers.

Abstract: A two source passive ring resonator gyroscope having a single piece body with integral first, second and third resonator cavities. A first laser means uses the first resonator cavity to provide a first single frequency light source. A second laser uses the second resonator for a second laser to provide a second single frequency light source. The third resonator cavity is a passive high Q evacuated cavity having a closed optical path tuned to resonate at substantially the light frequency of the first and second resonator cavities. The first signal frequency light source is split into a propagating light source and a first reference frequency light source. The propagating source is coupled into the third resonator cavity to form a propagating light beam. The second single frequency light source is split into a second frequency light source and into a second reference frequency light source.

Abstract: An accelerometer comprising a frame having an input axis (y) and a cross axis (x) orthogonal to and co-planar with the input axis. The accelerometer has a flexible beam coupled to a proofmass. The beam is supported at a pivot location. A rotator coupled to the frame provides a restoring force having a first or second polarity to the beam. The restoring force is applied in a direction parallel to the input axis (y) to restore the proofmass to a reference position in response to an absence of acceleration along the input axis. A position signal sensor provides an error signal proportional to the displacement of the proofmass from the reference position. A servo responds to the error signal by applying a drive signal to the rotator which applies a restoring force to the flexible beam to restore the proofmass to its reference position.