Briefs : Photonics/Optics
High-Performance Processor of Hyperspectral Images

The Remote Sensing Hyperspectral Engine (RSHE) is a special-purpose, portable computer that performs high-performance processing of hyperspectral image data collected by a remote-sensing optoelectronic apparatus. Typically, the remote-sensing apparatus is airborne or spaceborne, the images are...

Briefs : Electronics & Computers
Lateral-Current-Collection HgCdTe Infrared Detectors

Arrays of HgCdTe infrared photodetectors have been developed to satisfy stringent performance requirements for use in NASA’s Tropospheric Emission Spectrometer. The design of these detectors improves (relative to prior such arrays) manufacturing yield, current-versus-voltage characteristics,...

Briefs : Photonics/Optics
Portable Airborne Multispectral-Imaging System

A portable instrumentation system that includes an airborne and a ground-based subsystem acquires multispectral image data over swaths of terrain ranging in width from about 1/2 to 1 km. The system was developed especially for use in surveying coastal environments; it is also well suited for...

Briefs : Electronics & Computers
Lossless Image-Compression Algorithm Implemented in an FPGA

A lossless image-compression algorithm that can be executed entirely in electronic hardware has been developed. This algorithm yields about 15 percent more compression than does the Rice algorithm, which is a lossless-compression algorithm commonly used for transmitting images from...

Briefs : Physical Sciences
A Multifunctional Active-Excitation Spectral Analyzer

A highly sensitive, low-power, low-noise multifunctional active-excitation spectral analyzer (MAESA) that would span the wavelength range of 0.5 to 2.5 µm and would operate near room temperature is undergoing development. The fully developed MAESA is expected to be a portable and highly...

Briefs : Photonics/Optics
Hardware and Software for Air-to-Air Schlieren Imaging

Software and electronic hardware are being developed to provide cockpit guidance and camera control for an air-to-air schlieren photography system that is to be used to take high-resolution pictures of shock waves generated by a full-scale airplane (see Figure 1). For success in schlieren...

Briefs : Information Technology
Multirover Coordination Based on Contract Net Protocol

A computer program coordinates operations of multiple cooperating rovers (small exploratory robotic vehicles deployed from a lander spacecraft), each of which is equipped with computer hardware and software that schedule the tasks assigned to it. The program implements a contract net...

Briefs : Physical Sciences
Development of Sensors for Detecting Leaks of O2 and H2

The Propulsion group at Dryden Flight Research Center is performing analyses of the effectiveness of chemical-species sensors for detecting and assessing leakage. The group is also studying relationships between (1) rates at which high-energy species leak from the propellant-feed systems of...

Briefs : Physical Sciences
Micromachined Emitter/Bolometer Structures for Infrared Gas Sensors

Infrared gas sensors that could be mass-produced at relatively low cost have been proposed for a variety of applications — for example, detecting carbon monoxide in air inside houses. A sensor of this type would include a housing into which ambient air could diffuse. The gas...

Briefs : Electronics & Computers
Radiation-Tolerant CMOS Image Sensors

Complementary metal oxide semiconductor (CMOS) integrated-circuit image sensors that are highly tolerant of high-energy radiation ("radiation hard") are undergoing development. These devices are sensitive to visible light, yet are insensitive to diverse types of highly energetic radiation, including protons...

Briefs : Physical Sciences
Deployable Shell Structures With Shape-Control Actuators

Advanced control systems that include built-in smart-material elastic-deformation structural actuators have been proposed for deployable thin-shell structures that are required to be maintained in precise shapes once deployed. This approach to structural shape control was conceived to...

Briefs : Mechanical & Fluid Systems
"Smart" Actuators for Alleviating Buffet of Aircraft

An active-control surface modal (ACSM) device has been developed as an improved means of alleviating buffet of an aircraft. The ACSM device is a "smart" actuator system that includes an array of antagonistic piezoelectric actuators installed within a rudder or other aircraft control surface...

Briefs : Electronics & Computers
Low-Sidelobe Microwave Reflector Antennas and Dichroic Plate

The figure depicts the basic geometric features of an antenna system designed to be part of a miniature atmosphere-sounding passive microwave radiometer to be flown at high altitude aboard a remotely piloted aircraft. The system includes (1) a scanning flat reflector; (2) a dichroic...

Briefs : Electronics & Computers
Simple Phase Shifter for a Scanning-Beam Antenna

A simple, inexpensive device has been conceived for shifting the phase of a signal in a feed line of a scanning-beam microstrip antenna in order to change the direction of the beam. Heretofore, phase shifters used for this purpose have been relatively bulky and expensive.

Briefs : Electronics & Computers
High-Capacity Nickel-Hydrogen Cells

Nickel-hydrogen electrochemical cells with capacities of 350 ampere-hours have been developed. These cells are intended primarily for use in government and commercial satellites; they have been fully qualified to satisfy performance requirements for operation in geosynchronous satellites for as long as 15...

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