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Briefs: Photonics/Optics
An apparatus that includes a pulsed electron gun and a high-resolution ultraviolet spectrometer has been developed for use in (1) pulsed electron-impact excitation of transitions among...
Briefs: Photonics/Optics
Infrared-sensor systems for real-time detection of accretion of ice on helicopter rotor blades are undergoing development. By providing early warnings of icing conditions, these systems...
Briefs: Photonics/Optics
Efforts are under way to develop back-surface-illuminated, thinned silicon charge-coupled devices (CCDs) with delta doping and integral optical filters to be used as image detectors...
Briefs: Photonics/Optics
Capture and Escape of Charge Carriers in Quantum Dots
A report describes an experimental investigation of effects of thermally induced intermixing of In0.6Ga0.4As and GaAs on the dynamics of photoexcited charge carriers in In0.6Ga0.4As/GaAs quantum dots. The quantum dots (nanometer-size islands of In0.6Ga0.4As surrounded by GaAs) were grown by...
Briefs: Photonics/Optics
Rayleigh-Scattering Measurements in Underexpanded Jets
A report describes experiments in which time-averaged and unsteady local variations in the densities of underexpanded supersonic free jets issuing from a choked circular nozzle were measured by laser-induced Rayleigh scattering. This study is part of a continuing effort to understand the...
Briefs: Photonics/Optics
Common-path heterodyne interferometers (COPHIs) have been proposed for measuring small variations in the heights of surfaces. A COPHI could be used, for example, to measure the deviation of the surface of...
Briefs: Photonics/Optics
Shared-aperture multiplexed holographic scanning telescopes have been proposed for use in lidar transceivers and other laser transmitters and receivers in remote sensing instruments....
Briefs: Information Technology
Coherent Phase Line Enhancer: a Method of Spectral Analysis
The term "coherent phase line enhancer" (CPLE) refers to a dual-transform method of spectral analysis that enhances the detection of periodic and quasi-periodic signals buried in wide-band noise. The CPLE is particularly useful for increasing the signal-to-noise ratios of spectral peaks...
Briefs: Information Technology
Software for Secure Distribution of Data
MECS is a computer program for the automated, secure, rapid, and efficient transfer of data between a central source and users at multiple distant locations. "MECS" signifies "Multi-mission Encrypted Communication System." MECS enables many users to collaborate securely on a shared plan or set of data.
Briefs: Software
Software for Real-Time Transfer of GPS Data Over the Open Internet
Real-Time Net Transfer (RTNT) software allows for efficient and reliable transport of raw, GPS (Global Positioning System) observables over the open Internet. Efficiency is achieved by editing and compressing the GPS observables at the remote site, and by using User Datagram...
Briefs: Electronics & Computers
A processing system has been developed to meet increasing demands for detailed noise measurement of aircraft in wind tunnels. Phased arrays enable spatial and amplitude measurements...
Briefs: Information Technology
Common Database Interface and Report Generator
The Common Database Interface and Report Generator is a computer program that serves as both (1) a single common interface for data-base application programs to gain access to local or remote data bases by use of Structured Query Language (SQL) operators and (2) a report generator.
Briefs: Software
Software for Displaying Coregistered Sets of Data
The DataSlate computer program is being developed to help educators and students gain access to, view, manipulate, and otherwise interact with sets of planetary and other scientific data via the Internet or via local data-storage facilities. DataSlate will be especially useful for displaying...
Briefs: Electronics & Computers
The Wireless Augmented Reality Prototype (WARP) is a system for personal access to a local area network with video, audio, and sensor data services. The center of the WARP system is a...
Briefs: Electronics & Computers
Multiple-quantum-well (MQW) AlxGa1-xAs/GaAs infrared photodetectors that are better suited [relative to prior AlxGa1-xAs/GaAs quantum-well infrared photodetectors (QWIPs)] for...
Briefs: Electronics & Computers
Airfield Wind Advisory Systems for General Aviation
An Airfield Wind Advisory System (AWAS) includes a self-contained weather station, located at an airfield, that measures speed and direction of the wind, the temperature, the barometric pressure, and the humidity. This ground station digitizes these measurements and transmits the measurement data...
Briefs: Software
Computing Radiation Fluxes, Power, and Temperature for TOPEX
A computer program performs a unified analysis of the radiation exposure, the temperatures, and the power generation and distribution for predicting the performance of the TOPEX satellite on orbit and during maneuvers. The unified analysis is needed because all aspects are...
Briefs: Software
Program for Updating Parameters of Thermal Models
Parameter Identification in Thermal Networks (PITN) is a computer program developed to satisfy a need to update parameters in mathematical models of thermal systems in order to make the temperatures computed by the models equal to the temperatures measured in tests of the corresponding real...
Briefs: Software
Program Tracks Operation of a Remote Solid-State Recorder
Solid State Recorder Pointer Tracker (SSRPT) is a computer program developed specifically to aid ground-based monitoring and control of two redundant solid-state recorders (SSRs) aboard the Cassini Spacecraft. The SSRs store telemetry data until downlink times, which are limited to a...
Briefs: Software
Library for Developing Spacecraft-Mission-Planning Software
The Platform Independent Software Components for the Exploration of Space (PISCES) software library provides for web-based, collaborative development of computer programs for planning trajectories and other trajectory-related aspects of spacecraft-mission design. The PISCES library...
Briefs: Mechanical & Fluid Systems
A lightweight, collapsible hyperbaric chamber/airlock system has been proposed as a portable unit for treating decompression sickness. Copies of the system could be stowed compactly and...
Briefs: Mechanical & Fluid Systems
A family of rugged, modular, reconfigurable, instrumented robotic vehicles has been proposed for use in exploration of the surfaces of Mars and other remote planets. These or similar vehicles could...
Briefs: Medical
Electrokinetically enhanced bioremediation (EEB) is a method of engineered bioremediation of soil contaminated by such organic compounds as solvents and petroleum products. As depicted...
Briefs: Medical
Microgravity Tissue Engineering
A continuing program of research and development focuses on engineering of functional cartilage and cardiac muscle for scientific research and for eventual use in transplants. The program involves the use of cells, polymer scaffolds, and bioreactor vessels. A polymer scaffold serves as a three-dimensional structure...
Briefs: Photonics/Optics
Experiments have demonstrated the feasibility of using flame-heated refractory dielectric solid bodies as wavelength-selective sources of light for special applications; in...
Briefs: Photonics/Optics
Arrays of photon-counting detectors and associated digital signal processors have been proposed for receivers in optical communication systems in which the optical signals...
Briefs: Motion Control
Proposed packages called "remote engineering units" (REUs) would contain all the electronic circuitry needed to implement a subset of the design of the motor-control system of a robot....
Briefs: Photonics/Optics
Pyramid-Shape Light Coupler for Multi-Quantum-Well Photodetectors
Wavelength-independent light couplers in the form of planar arrays of pyramids have been proposed for use on multiple-quantum-well infrared photodetectors. Wavelength-independent light couplers are needed for focal-plane arrays of QWIPs designed to operate in multiple and/or broad...
Briefs: Motion Control
An improved radiator has been designed to provide inexpensive and highly reliable thermal control for an extravehicular mobility unit (EMU) [basically, a space suit equipped with a portable life-support system...
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