Briefs : Electronics & Computers
Circuits Control Test Power-Turn-On and -Turn-Off Transients

Two electronic circuits that generate controlled power-turn-on and power-turn-off transients have been developed. These circuits are parts of a suite of test equipment used to measure the responses, to power-bus transients, of power supplies and power-consuming electronic circuitry...

Briefs : Photonics/Optics
Stabilization and Registration of Sequential Video Images

A computational process converts a sequence of digitized video images of the same scene into stabilized, coregistered images of an area of interest within the scene. The process corrects for motion of the area of interest or of the camera (as manifested by rotation, translation, and/or...

Briefs : Photonics/Optics
Arrays of QWIPs With Spatial Separation of Multiple Colors

Focal-plane arrays of quantum-well infrared photodetectors (QWIPs) featuring adjacent pixels sensitive to different colors have been proposed. An array of this type would make it possible to image the same scene in multiple wavelength bands simultaneously on the same focal plane,...

Briefs : Physical Sciences
Making Three-Dimensional Holograms Visible From All Sides

A technique for projecting holographic images to make both still and moving three-dimensional displays is undergoing development. Unlike older techniques based on stereoscopy to give the appearance of three-dimensionality, the developmental technique would not involve the use of...

Briefs : Physical Sciences
Electrometer for Triboelectric Evaluation of Materials

An electrometer developed for measuring the triboelectric responses of soils on Mars is also potentially useful on Earth for identifying some materials via their triboelectric responses. In operation, an array of triboelectric sensors is rubbed against the material of interest for a...

Briefs : Information Technology
The Complexity of the Diagnosis Problem

A report presents a study of the complexity of an algorithm that performs model-based diagnosis of a complex hardware system. [In model-based diagnosis, an algorithm detects logical inconsistencies between observational data and a description (mathematical model) of the system.] In the study, the problem...

Briefs : Mechanical & Fluid Systems
Design Concepts for the ISS TransHab Module

Twelve reports present concepts for the design of structural and functional systems, subsystems, and components of the proposed TransHab module — an inflatable, lightweight habitation module that would be used by crewmembers of the International Space Station and would serve as a prototype of...

Briefs : Physical Sciences
Characteristics of Supercritical Transitional Mixing Layers

This report describes a study of threedimensional, temporal mixing layers between different fluids initially flowing at different velocities under supercritical conditions. The study involved direct numerical simulations by use of a validated mathematical model of high-pressurefluid...

Briefs : Physical Sciences
Infrared CO2 Sensor With Built-In Calibration Chambers

A proposed infrared CO2 sensor, operated in conjunction with suitable readout, data-processing, and control circuitry, could be calibrated repeatedly during operation to compensate for changes in sensor response induced by such phenomena as aging and changes in temperature. The...

Briefs : Physical Sciences
Solid-State Potentiometric CO Sensor

A solid-state sensor was developed that measures the concentrations of one or more gases of interest in a mixture of gases. This simple solid-state sensor produces a voltage signal that is sensitive to CO concentration from percent to ppm (parts per million) levels. It was intended originally for use in...

Briefs : Physical Sciences
Planetary Rover Absolute Heading Detection Using a Sun Sensor

A relatively inexpensive Sun sensor for determining the absolute heading of planetary rovers to within ± 3° using a monochrome charge-coupled device (CCD) camera is presented. The Sun sensor was developed for the Field Integrated, Design and Operations (FIDO) rover. This rover is an...

Briefs : Electronics & Computers
Concept for Utilizing Full Areas of STJ Photodetector Arrays

A method of designing improved monolithic planar arrays of superconducting tunnel junctions (STJs) for use as photodetectors has been conceived. These arrays would be suitable for detecting images at low light levels. They are for operation in the individual-photon- counting regime;...

Briefs : Electronics & Computers
Development of Cognitive Sensors

A technical report enunciates the concept of a hierarchy of sensor classes (meaning transducers, associated circuitry, and embedded software) that have different levels of intelligence, and discusses issues pertaining to the development of sensors of the highest level of intelligence, called cognitive. The other...

Briefs : Electronics & Computers
Enabling Higher-Voltage Operation of SOI CMOS Transistors

A “smart” back-gate driver circuit has been proposed to enable the operation, at voltages higher than were previously possible, of a silicon-on-insulator (SOI) complementary metal oxide/semiconductor (CMOS) integrated circuit that contains both low- and high-voltage transistors...

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