James H. McQuaid and Anthony D. Lavietes
Ambient Temperature Cadmium Zinc Telluride Radiation Detector and Amplifier Circuit
U.S. Patent 5,757,227
May 26, 1998
A low-noise, low-power-consumption, compact, ambient-temperature signal amplifier for a cadmium-zinc-telluride radiation detector that allows efficient, high-resolution detection; isotopic analysis; and identification of radionuclides in the field. The circuit stages of this amplifier use integrated circuit amplifiers, rather than discrete components, and include a very-low-noise, high-bandwidth, dual-part preamplification stage; an amplification stage; and a filter stage. By using integrated circuits and a single 12-volt power supply and ground, this amplifier saves significant power; is well suited for prolonged, portable, in-field use; and does not require a heavy, bulky power supply.
Thomas E. McEwan
Short Range, Ultra-wideband Radar with High Resolution Swept Range Gate
U.S. Patent 5,757,320
May 26, 1998
A radar range finder and hidden-object locator based on ultrawideband radar with a high-resolution swept range gate. The device generates an equivalent time-amplitude scan with a typical range of 4 inches to 20 feet and an analog range resolution as limited by a jitter of about 0.01 inch. A differential sampling receiver is used to effectively eliminate ringing and other aberrations induced in the receiver by the near proximity of the transmit antenna. As a result, a background subtraction is not needed, thus simplifying the circuitry while improving performance.
Steven J. Deteresa and E. Groves
Interface Structure for Hub and Mass Attachment in Flywheel Rotors
U.S. Patent 5,758,549
June 2, 1998
An interface structure for hub and mass attachment in flywheel rotors. The interface structure efficiently transmits high radial compression forces and withstands both large circumferential elongation and local stresses generated by mass-loading and hub attachments. The interface structure is composed of high-strength fiber, such as glass and carbon, woven into an angle pattern that is about 45 degrees with respect to the rotor axis. The woven fiber is bonded by a ductile matrix material that is compatible with and adheres to the rotor material. This woven fiber is able to elongate in the circumferential direction to match the rotor growth during spinning.
Anthony M. McCarthy
Silicon on Insulator with Active Buried Regions
U.S. Patent 5,760,443
June 2, 1998
A method for forming patterned buried components, such as collectors, sources, and drains, in silicon-on-insulator devices. The method is carried out by epitaxially growing a suitable sequence of single- or multiple-etch stop layers (ending with a thin silicon layer) on a silicon substrate, masking the silicon such that the desired pattern is exposed, introducing and activating dopant in the thin silicon layer to form doped regions, and then bonding the silicon layer to an insulator substrate and removing the silicon substrate. The method also involves forming electrical contact regions in the thin silicon layer for the buried collectors.
Daniel M. Makowiecki, John A. Kerns, Kenneth L. Blaedel, J. Colella, Pete J. Davis, and Robert S. Juntz
Precision Replenishable Grinding Tool and Manufacturing Process
U.S. Patent 5,762,660
June 9, 1998
A reusable grinding tool consisting of a replaceable single layer of abrasive particles bonded to a precisely configured tool substrate and a process for manufacturing the grinding tool. The manufacturing process involves coating the ceramic or metal tool substrate with layers of metal, such as titanium, copper, and titanium by vapor deposition; applying diamond or cubic boron nitride abrasive particles to the coated surface by a slurry technique; and brazing the abrasive particles to the tool substrate by alloying the metal layers. The precision control of the composition and thickness of the metal layers enables the bonding of a single layer or several layers of micrometer-size abrasive particles to the tool surface. Incorporation of an easily dissolved metal layer in the composition allows the removal and replacement of the abrasive particles.
Amorphous Diamond Films
U.S. Patent 5,763,087
June 9, 1998
A method for coating a substrate with an amorphous diamond film by biasing the substrate to be coated and depositing carbon ions on it under controlled temperature conditions. The method significantly reduces the intrinsic stress on the film and improves adhesion.
Thomas E. McEwan
Body Monitoring and Imaging Apparatus and Method
U.S. Patent 5,766,208
June 16, 1998
A nonacoustic pulse-echo radar monitor is employed in the repetitive mode, whereby a large number of reflected pulses are averaged to produce a voltage that modulates an audio oscillator to produce a tone that corresponds to the heart's motion. The antenna used in this monitor generally comprises two flat copper foils, thus permitting the antenna to be housed in a substantially flat housing. The monitor converts the detected voltage to an audible signal with both amplitude modulation and Doppler effect. It also uses a dual time constant to reduce the effect of gross sensor-to-surface movement. The monitor detects the movement of one or more internal body parts (heart, lungs, arteries, vocal chords) and includes a pulse generator for simultaneously inputting a sequence of pulses to a transmit path and a grating path. The device has applications in medicine and rescue operations.