Tech Briefs

Real-Time Data Display


RT-Display is a MATLAB- based data acquisition environment designed to use a variety of commercial off-the-shelf (COTS) hardware to digitize analog signals to a standard data format usable by other post-acquisition data analysis tools. This software presents the acquired data in real time using a variety of signal-processing algorithms. The acquired data is stored in a standard Operator Interactive Signal Processing Software (OISPS) data-formatted file.

Posted in: Briefs, TSP, Software, Computer software / hardware, Computer software and hardware, Data acquisition and handling, Computer software / hardware, Computer software and hardware, Data acquisition and handling, Displays, Displays

Collaborative Resource Allocation

Collaborative Resource Allocation Networking Environment (CRANE) Version 0.5 is a prototype created to prove the newest concept of using a distributed environment to schedule Deep Space Network (DSN) antenna times in a collaborative fashion. This program is for all space-flight and terrestrial science project users and DSN schedulers to perform scheduling activities and conflict resolution, both synchronously and asynchronously. Project schedulers can, for the first time, participate directly in scheduling their tracking times into the official DSN schedule, and negotiate directly with other projects in an integrated scheduling system.

Posted in: Briefs, Software, Antennas, Computer software / hardware, Computer software and hardware, Antennas, Computer software / hardware, Computer software and hardware

Electroform/Plasma-Spray Laminates for X-Ray Optics

Properties of lightweight components can be optimized.

Electroform/ plasma-spray laminates have shown promise as lightweight, strong, low-thermal-expansion components for x-ray optics. The basic idea is to exploit both (1) the well-established art of fabrication of optical components by replication and (2) plasma spraying as a means of reinforcing a thin replica optic with one or more backing layer(s) having tailorable thermomechanical properties. In x-ray optics as in other applications, replication reduces the time and cost of fabrication because grinding and polishing can be limited to a few thick masters, from which many lightweight replicas can thereafter be made.

Posted in: Briefs, ptb catchall, Tech Briefs, Photonics, Optics, Optics, Forming, Spraying, Parts, Radiation

Preventing Raman Lasing in High-Q WGM Resonators

Raman-lasing threshold power is increased through suitable choice of dimensions.

A generic design has been conceived to suppress the Raman effect in whispering-gallery-mode (WGM) optical resonators that have high values of the resonance quality factor (Q). Although it is possible to exploit the Raman effect (even striving to maximize the Raman gain to obtain Raman lasing), the present innovation is intended to satisfy a need that arises in applications in which the Raman effect inhibits the realization of the full potential of WGM resonators as frequency-selection components. Heretofore, in such applications, it has been necessary to operate high-Q WGM resonators at unattractively low power levels to prevent Raman lasing. (The Raman-lasing thresholds of WGM optical resonators are very low and are approximately proportional to Q–2.)

Posted in: Briefs, TSP, ptb catchall, Tech Briefs, Photonics, Amplifiers, Lasers, Optics, Amplifiers, Lasers, Optics

Procedures for Tuning a Multiresonator Photonic Filter

A desired high-order filter function can be established and maintained.

Two procedures have been devised for tuning a photonic filter that comprises multiple whispering-gallery-mode (WGM) disk resonators. As used here, “tuning” signifies locking the filter to a specific laser frequency and configuring the filter to obtain a desired high-order transfer function.

Posted in: Briefs, TSP, ptb catchall, Tech Briefs, Photonics, Optics, Optics, Acoustics, Acoustics

Extended-Range Ultrarefractive 1D Photonic Crystal Prisms

Practical applications could include miniature spectrometers and wavelength-division multiplexers.

A proposal has been made to exploit the special wavelength-dispersive characteristics of devices of the type described in “One-Dimensional Photonic Crystal Superprisms” (NPO-30232) NASA Tech Angle of Incidence Briefs, Vol. 29, No. 4 (April 2005), page 10a. A photonic crystal is an optical component that has a periodic structure comprising two dielectric materials with high dielectric contrast (e.g., a semiconductor and air), with geometrical feature sizes comparable to or smaller than light wavelengths of interest.

Posted in: Briefs, TSP, ptb catchall, Tech Briefs, Photonics, Lasers, Waveguides, Lasers, Waveguides

Robust Mapping of Incoherent Fiber-Optic Bundles

Images scrambled by the bundles can be unscrambled.

A method and apparatus for mapping between the positions of fibers at opposite ends of incoherent fiber-optic bundles have been invented to enable the use of such bundles to transmit images in visible or infrared light. The method is robust in the sense that it provides useful mapping even for a bundle that contains thousands of narrow, irregularly packed fibers, some of which may be defective.

Posted in: Briefs, ptb catchall, Tech Briefs, Photonics, Architecture, Fiber optics, Imaging, Imaging and visualization, Architecture, Fiber optics, Imaging, Imaging and visualization, Test equipment and instrumentation

Using G⁴FETs as a Data Router for In-Plane Crossing of Signal Paths

Cross-talk is low enough that integrity of signals could be preserved.

Theoretical analysis and some experiments have demonstrated that siliconon- insulator (SOI) 4-gate transistors of the type known as G4FETs could be efficiently used for in-plane crossing of signal paths. Much of the effort of designing very-large-scale integrated (VLSI) circuits is focused on area-efficient routing of signals. The main source of difficulty in VLSI signal routing is the requirement to prevent crossing, in the same plane, of wires that are meant to be kept electrically insulated from each other. Consequently, it often becomes necessary to design and build VLSI circuits in multiple layers with vias (connections between conductors in different layers at selected locations). Suitable devices that would prevent, or at least sufficiently suppress, undesired electrical coupling (cross-talk) between wires crossing in the same plane would enable compact, simpler implementation of complex interconnection networks with in-plane crossings that, heretofore, have not been possible in VLSI circuitry. The use of G4FETs as in-plane signal-crossing devices or routers, in combination with the use of G4FETs as universal programmable logic gates, would create opportunities for reducing complexity in VLSI design.

Posted in: Briefs, Electronics & Computers, Architecture, Integrated circuits, Transistors, Architecture, Integrated circuits, Transistors

Radiation-Tolerant Dual Data Bus

Dedicated hardware and software would detect radiation induced upsets on either of two buses.

An architecture, and a method of utilizing the architecture, have been proposed to enable error-free operation of a data bus that includes, and is connected to, commercial off-the-shelf (COTS) circuits and components that are inherently susceptible to single-event upsets [SEUs (bit flips caused by impinging high-energy particles and photons)]. The architecture and method are applicable, more specifically, to data-bus circuitry based on the Institute for Electrical and Electronics Engineers (IEEE) 1394b standard for a high-speed serial bus.

Posted in: Briefs, Electronics & Computers, Architecture, Architecture

Program Merges SAR Data on Terrain and Vegetation Heights

X/P Merge is a computer program that estimates ground-surface elevations and vegetation heights from multiple sets of data acquired by the GeoSAR instrument [a terrain-mapping synthetic-aperture radar (SAR) system that operates in the X and P bands]. X/P Merge software combines data from X- and P-band digital elevation models, SAR backscatter magnitudes, and interferometric correlation magnitudes into a simplified set of output topographical maps of ground-surface elevation and tree height.

Posted in: Briefs, Software, Computer software / hardware, Computer software and hardware, Radar, Computer software / hardware, Computer software and hardware, Radar, Terrain

The U.S. Government does not endorse any commercial product, process, or activity identified on this web site.