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Briefs: Photonics/Optics
Pulse shepherding (defined below) can be exploited to impress synchronized amplitude-modulation pulses, with durations of the order of picoseconds, onto beams of light with...
Briefs: Photonics/Optics
A dynamic-light-scattering (DLS) method that reduces undesired contributions from multiply scattered photons has been invented. The method involves, among other things,...
Briefs: Photonics/Optics
Under a Phase 1 Small Business Technology Transfer (STTR) award of $99,000 with Goddard Space Flight Center, Advanced Optical Systems Inc. (AOS) has produced a 13.5-kg/m2 6-in.-diameter mirror flat...
Briefs: Information Technology
A class of finite-impulse-response (FIR) digital filters has been developed to perform certain frequency-limiting, decimation, and differentiation (with respect to time) functions on a time...
Briefs: Physical Sciences
Figure 1 schematically depicts an experimental setup in which Rayleigh scattering from molecules of a flowing gas is used to measure the temperature and one component of the velocity...
Briefs: Electronics & Computers
Integrated Optical Voltage-Measuring Apparatus
An integrated optical voltage-measuring apparatus based on a Mach-Zehnder interferometer has been designed and constructed. The main feature of this apparatus is that optical fibers link part of it to an optical sensor head placed at the source of the voltage to be measured, whether the source be a...
Briefs: Electronics & Computers
The Integrated Test and Operations System (ITOS) is a generic system of software for controlling spacecraft and components of spacecraft during development, testing, and operation in orbit. The ITOS...
Briefs: Physical Sciences
The ULTRA SON computer program is designed for use in precise ultrasonic contact scan measurements for nondestructive characterization of materials. This program performs major functions...
Briefs: Electronics & Computers
Apparatus Records Acceleration and Temperature
An apparatus records triaxial acceleration and temperature as a function of time, operating unattended for as long as 3 weeks on power supplied by two D cells. The apparatus, which has dimensions of only 3.5 by 4.5 by 2.2 in. (8.9 by 11.4 by 5.6 cm) and weighs only 28.5 oz (0.81 kg) is designed...
Briefs: Electronics & Computers
DRAM Circuit Tolerates Single-Event Upsets
A dynamic random-access memory (DRAM) circuit that tolerates single-event upsets (SEUs) has been developed. A single-event upset is a bit flip caused by ionizing radiation. In a DRAM, the state of each bit (0 or 1) is stored as charge on a buried capacitor. The impingement of an energetic charged particle...
Briefs: Electronics & Computers
Researchers are following two approaches in an effort to improve the low-noise performances of InP-based high-electron-mobility transistors (HEMTs) that could be used as front-end...
Briefs: Electronics & Computers
An improved three-dimensional (3-D) scheme for modular packaging and interconnection of electronic circuits has been proposed to overcome deficiencies of an older scheme and to obtain...
Briefs: Software
Software for Monitoring Remote Systems and Executing Plans
The Knowledge Server Tools (KST) computer program comprises a distributed set of software tools for monitoring remote systems. Part of KST implements a knowledge server for monitoring the status of a remote system (e.g., a computer-controlled instrumentation system, a robot, or a...
Briefs: Software
Monocoque Tank Analysis Spreadsheet System, Version 2.0
The Monocoque Tank Analysis Spreadsheet System (MONTASS) computer program is an integrated software system that incorporates Microsoft Excel worksheet software and Visual BASIC software. MONTASS was developed to enable rapid analysis and preliminary design of structural domes and...
Briefs: Software
Automated Planning and Scheduling for a Robotic Vehicle
A software system generates sequences of commands for the operation of a robotic vehicle. The system was adapted to control Rocky 7, a semiautonomous instrumented vehicle of the "rover" type used in scientific exploration of Mars. The software system was developed by integrating two software...
Briefs: Materials
Protective Shells for Composite Overwrapped Pressure Vessels
White Sands Test Facility (WSTF) scientists have developed an energy-absorbing laminated shell that is a prototype of lightweight, inexpensive, and removable covers to shield and otherwise protect carbon-composite overwrapped pressure vessels (COPVs). Although COPVs are superior to metal...
Briefs: Materials
Nonevaporable Getters To Maintain Vacuum in Sealed MEMS
Nonevaporable getters have been proposed for use in maintaining vacuum inside hermetically sealed microelectromechanical systems (MEMS) that rely on vacuum for proper operation. A vibratory microgyroscope is an example of such a MEMS. The proposed getters could also be used in such vacuum...
Briefs: Mechanical & Fluid Systems
The spherical-coordinates encoder module (SCEM) is a relatively simple and inexpensive electromechanical apparatus for quickly and easily measuring three-dimensional offsets between objects at distances of...
Briefs: Motion Control
Technological advances have driven the evolution of aircraft flight-control systems. In the dawn of 20th-century aviation, the Wright Brothers used cables and warping of wing surfaces to change...
Briefs: Medical
Improved miniature biotelemetric units resembling large pills have been proposed for use in physiological monitoring of the gastrointestinal tract. The broad principles of design, operation,...
Briefs: Electronics & Computers
Lightweight Reflector Dishes Would Be Made by Spin Casting
Lightweight reflector dishes for radio antennas would be mass-produced cheaply by spin casting of polymers, according to a proposal. These reflector dishes were conceived for compact stowage followed by deployment and operation aboard spacecraft, but might also be useful on Earth in...
Briefs: Electronics & Computers
Retroreflective Communication Systems
A retroreflective communication system (RCS), is a state-of-the-art system that provides (1) two-way optical communication using only one transmitter and (2) multipath communication among remote locations. RCSs were conceived for use in communication among stations on the ground and aboard spacecraft in...
Briefs: Medical
Urine-Sample-Collection Device for Use on the Space Shuttle
The in-flight urine collection absorber (IUCA) is a Johnson Space Center (JSC) breakthrough. It features a lightweight, compact design and is easy to use for collection of urine samples by male and female space shuttle crewmembers. The IUCA is superior to currently available hardware for...
Briefs: Motion Control
Adaptive variable bias control (AVBC) is an improved technique for controlling the currents supplied to the electromagnets in magnetic bearings. In AVBC, the bias currents are varied in such...
Briefs: Motion Control
The term "mechanical mirroring using controlled stiffness and actuators" ("MEMICA") denotes a developmental concept for reflecting contact forces, displacements, mechanical damping,...
Briefs: Electronics & Computers
A phased-array-fed cylindrical-reflector antenna with superquadric projected aperture has been designed to afford the ability to scan the beam over a wide angular range without having...
Briefs: Photonics/Optics
Open-cell silicon carbide foam coated with a ferrite-filled absorbing resin has been found to be useful for black-body absorbers at millimeter and submillimeter wavelengths. The...
Briefs: Motion Control
A commercial version of the NASA plasma-contactor hollow-cathode assembly (PC HCA) has been developed. The NASA PC HCA is a highly reliable hollow discharge cathode that is the most thoroughly...
Briefs: Photonics/Optics
Adaptive Filtering of SAR Interferograms
An algorithm for filtering synthetic-aperture-radar (SAR) interferograms has been developed which substantially improves the performance of subsequent phase-unwrapping. It accomplishes this task by filtering the interferogram strongly in areas where the scene contains little detail, and weakly where the...
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