Briefs : Electronics & Computers
PCI Bridge to Instruments and Telecommunication Systems

A report describes a prototype system interface assembly (SIA) that performs the functions of a compact, radiation-hard application-specific integrated circuit (ASIC) to be built subsequently. The SIA ASIC would be installed in a spacecraft, where it would function as a peripheralcomponent...

Briefs : Physical Sciences
Effect of Gravitation on Noninteracting Trapped Fermions

A report presents a theoretical study of the thermodynamics of an ultralow-temperature gas of fermions that interact with a gravitational field and with an externally imposed trapping potential but not with each other. The gravitational field is taken to define the z axis and the trapping...

Briefs : Mechanical & Fluid Systems
Improvements in a Piezoelectrically Actuated Microvalve

A report discusses the continuing development of a normally closed, piezoelectrically actuated valve fabricated mostly by micromachining of silicon. The design and operation of the microvalve as described in the instant report are basically the same as those of the version described in...

Briefs : Mechanical & Fluid Systems
Low-Energy Transfer From Near-Earth to Near-Moon Orbit

A report presents a theoretical approach to designing a low-energy transfer of a spacecraft from an orbit around the Earth to ballistic capture into an orbit around the Moon. The approach is based partly on the one presented in “Low-Energy Interplanetary Transfers Using Lagrangian...

Briefs : Photonics/Optics
Testing Grazing-Incidence Mirrors at Nearly Normal Incidence

An optical system that utilizes visible light at nearly perpendicular incidence has been invented for use in testing the surface figures of nominally axisymmetric (paraboloidal, ellipsoidal, or conical) mirrors designed to function at grazing incidence. Such mirrors can be used as the...

Briefs : Photonics/Optics
Making Digital Composite Images for Technical Illustration

A method of generating three-dimensional composite digital images can serve multiple purposes in technical illustration. The method was devised to accelerate and facilitate the design of new electric lights and receptacles for large buildings, and can just as well be applied to the...

Briefs : Photonics/Optics
Phase-Retrieval Camera for Optical Testing

A portable instrument denoted a phase-retrieval camera (PRC) is designed to enable the testing of large, lightweight optics in the presence of vibrations and atmospheric turbulence. The development of the PRC was prompted by the fact that conventional optical-testing techniques are not sufficiently...

Briefs : Photonics/Optics
Liquid-Crystal Phase-Shifting Shearing Interferometer

The liquid-crystal phase-shifting shearing interferometer is a common-path interferometer based partly on a lateral-shear-plate interferometer. It bears a partial similarity to the liquid-crystal point-diffraction interferometer (LCPDI), which is also of the common-path type. The...

Briefs : Photonics/Optics
Fiber-Optic Phase-Locked Loop Sensitive to Local Strain Only

The figure schematically depicts an apparatus for measuring strain at only one designated location on a structure. The apparatus is a fiber-optic phase-locked loop, wherein strain in a multimode optical fiber gives rise to a change in the phase of modulation of a laser beam that...

Briefs : Photonics/Optics
Light Recycling and Color Scrolling for Brighter Displays

The efficiencies and thus the brightnesses of flat-panel projectors based on liquid-crystal devices (LCDs) and digital mirror devices (DMDs) would be increased by the combination of a color-scrolling technique and a light-recycling technique, according to a proposal. These techniques...

Briefs : Photonics/Optics
Multi-Screen-Image- and Catalog-Viewing Program

A computer program enables the single- or multi-screen display of multispectral, multiresolution images — especially astronomical ones — stored as sets of data that range upward in size from hundreds of gigabytes. In cases of multi-screen displays, the software synchronizes the screens so that...

Briefs : Photonics/Optics
Software Automates Processing of SAR Image Data

The Automated SAR Image Processor (ASIP) computer program increases the efficiency of production of scientifically useful imagery from raw synthetic-aperture-radar (SAR) image data. In the absence of ASIP, the processing of SAR data is a labor-intensive task, often involving supporting personnel,...

Briefs : Photonics/Optics
Compact, Stiff, Lightweight, Quick-Release Clamp

The term "COSMOWRAP" denotes a compact, stiff, remotely actuatable, lightweight, quick-release clamp that could be substituted for the larger, heavier, and more-difficult-to-use toggle-action clamp now used in the space shuttle orbiter docking system (ODS) to perform contingency separations. In...

Briefs : Electronics & Computers
Ground-Traffic Information-Management System for an Airport

A computer-based system, and a method built around the use of the system, have been developed to automate the acquisition, integration, and management of data that have been generated at different rates by multiple, heterogeneous, incompatible sources. The system [hereafter denoted the...

Briefs : Electronics & Computers
Mixed-Signal Driver ASIC for IEEE 1394 and I²C Buses

The IEEE 1394 and I2C Mixed-Signal Driver is one of two application-specific integrated circuits (ASICs) designed to function together as an interface among the following three digital-signal buses:

A peripheral component interface (PCI) bus; A high-speed serial data bus that...

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