Briefs : Mechanical & Fluid Systems
Gear Bearings and Gear-Bearing Transmissions

Gear bearings are conceptual mechanical components so named because they function as gears and as roller and/or thrust bearings. Gear bearings will be essential components of the next generation of compact, large-mechanical- advantage gear drives.

Briefs : Mechanical & Fluid Systems
Linear Dynamometer With Variable Stroke and Frequency

An improved linear dynamometer has been developed for testing linear alternators that are to be used to convert mechanical power to electrical power in free-piston Stirlingcycle engines. Both the frequency and the length of the stroke of this dynamometer can be varied continuously, even...

Briefs : Photonics/Optics
Adaptive Multiplexing for Free-Space Optical Communication

"Laser-based adaptive wavelength division multiplexing and code division multiplexing" (LAWDM-CDM) is the name of a method that has been proposed to increase security, signal-to-noise ratios (SNRs), redundancy, and adaptability in free-space optical communications. The need for this or...

Briefs : Photonics/Optics
Magnetically Suspended Optical Chopper Wheel

A magnetically suspended, motor-driven light-chopping wheel has been developed as an alternative to a traditional light-chopping wheel suspended on ball bearings. This chopper (see figure) is designed to satisfy application-specific requirements to fit into a small volume, dissipate relatively little...

Briefs : Photonics/Optics
Fiber-Optic Rotary Joint for Passing High-Definition Video

A video camera has been integrated with a tracking pedestal (see figure) for tracking of aircraft and spacecraft. The camera is of a high-definition (1,280 × 720 pixels), progressive-scan, 60-frame-per-second digital type that conforms to NASA Standard 2818 (Digital Television...

Briefs : Photonics/Optics
Mesoscopic Steerable Mirror

A proposed lightweight, micromachined, multiaxis-steerable mirror would have mesoscopic dimensions. Its steering function would involve mesoscopic positional excursions of its support points and would be characterized by rapid slewing and moderate angular precision.

Briefs : Physical Sciences
Electrochemical Systems Generate Ozone and Ozonated Water

Improved electrochemical systems for generating ozone (in gaseous form and/or dissolved in water) have been invented for use in disinfection and in industrial processes in which the unique, highly oxidizing chemical properties of ozone are needed. More accurately, these systems generate...

Briefs : Electronics & Computers
Parallel-Processing High-Rate Digital Demodulator ASIC

An all-digital demodulator has been developed for receiving radio signals with multigigahertz carrier frequencies phase-modulated with digital data signals at bit rates of hundreds of millions of bits per second. The phase modulation could be either binary phase-shift keying (BPSK) or...

Briefs : Electronics & Computers
Reusable Software for Autonomous Diagnosis of Complex Systems

A software system designed to provide a purely signal-based diagnosis of virtually any time-varying system has been developed. This software is part of an overall concept called “Beacon-based Exception Analysis for Multimissions,” or BEAM. This concept provides for real-time...

Briefs : Electronics & Computers
TAXI Direct-to-Disk Interface Demultiplexes Proprietarily Formatted Data

The TAXI Direct-to-Disk interface is a special-purpose interface circuit for demultiplexing of data from a Racal Storeplex (or equivalent) multichannel recorder onto one or more hard disks that reside in, and/or are controlled by, a personal computer (PC). [The name...

Briefs : Software
Program Improves Transfer of Data From CAD to Machine Shops

The EMNet computer program has been developed to overcome the difficulties and reduce the errors that, heretofore, have been encountered in transferring data from computer-aided design (CAD) systems to computer numerically controlled (CNC) machines. EMNet could improve operations in...

Briefs : Information Technology
Compensating for Motion Errors in UWB SAR Data

A method of processing data acquired by ultra-wide-band (UWB) syntheticaperture radar (SAR) provides for suppression of those errors that are caused by the undesired relative motion of the radar platform and the targets. This method involves, among other things, processing of data in the wave-number...

Briefs : Software
Program for International-Temperature-Scale Calculations

A computer program implements several aspects of the International Temperature Scale of 1990 (ITS90).

Briefs : Software
Updated Global Atmospheric Reference Model Computer Programs

The 1999 version of the NASA/Marshall Space Flight Center Global Reference Atmospheric Model (GRAM-99) and version 3.8 of the Mars Global Reference Atmospheric Model (Mars- GRAM) are the latest in two series of computer programs for calculating selected physical properties of the...

Briefs : Software
Gyroscope Automated Testbed

The Gyroscope Automated Testbed (GAT) is a fully automated inertial device characterization testbed. Rotational response parameterization and shortterm noise stability analysis are the fundamental principles behind the system. Complete response characterization, bias stability, sensitivity, and range are supported...

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