Stories
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Briefs: Mechanical & Fluid Systems
Levitated Duct Fan (LDF) Aircraft Auxiliary Generator
This generator concept includes a novel stator and rotor architecture made from composite material with blades attached to the outer rotating shell of a ducted fan drum rotor, a non-contact support system between the stator and rotor using magnetic fields to provide levitation, and an integrated...
Briefs: Electronics & Computers
Microwave heating is an important process for many commercial, industrial, and household applications. Industrial microwave ovens are widely used for chemical processing, agri-food, medical products, and consumer...
Briefs: Photonics/Optics
Miniature Laser Magnetometer
A conceptual design has been developed for a miniature laser magnetometer (MLM) that will measure the scalar magnitude and vector components of near-Earth magnetic fields. The MLM incorporates a number of technical innovations to achieve high-accuracy and high-resolution performance while significantly reducing the size...
Articles: Materials
The Hall effect can be observed when the combination of a magnetic field through a sample and a current along the length of the sample create an...
Briefs: Electronics & Computers
Coupling Between Waveguide-Fed Slot Arrays
Coupling between two waveguide-fed planar slot arrays has been investigated using full-wave analysis. The analysis employs the method-of-moments solution to the pertinent coupled integral equa- tions for the aperture electric field of all slots. In order to compute coupling between two arrays, the input...
Articles: Electronics & Computers
Data communications in industrial environments can present special problems. Lines must be run over long distances, often ranging from thousands of feet to several miles, indoors and...
Briefs: Manufacturing & Prototyping
Development of Position-Sensitive Magnetic Calorimeters for X-Ray Astronomy
Metallic magnetic calorimeters (MMC) are one of the most promising devices to provide very high energy resolution needed for future astronomical x-ray spectroscopy. MMC detectors can be built to large detector arrays having thousands of pixels. Position-sensitive magnetic...
Briefs: Energy
A design of a highly efficient and lightweight space magnetic cooler has been developed at Goddard Space Flight Center that can continuously provide remote/distributed cooling at temperatures in the range of 2 K with a heat sink at about 15 K. The innovative design uses a cryogenic circulator that enables the cooler to operate at a high cycle frequency to achieve a large cooling capacity.
Briefs: Information Technology
Higher Order Mode Coupling in Feed Waveguide of a Planar Slot Array Antenna
A simple technique was developed to account for the higher order mode coupling between adjacent coupling slots in the feed waveguide of a planar slot array. The method uses an equation relating the slot impedance to the slot voltage and a reaction integral involving the...
Application Briefs: Robotics, Automation & Control
At Concordia Station in Antarctica, there is a telescope mount that has been operating for a few years. Recently, there was a new record temperature at the Dome C site: -84.6...
Briefs: Photonics/Optics
Radius of Curvature Measurement of Large Optics Using Interferometry and Laser Tracker
The determination of radius of curvature (ROC) of optics typically uses either a phase measuring interferometer on an adjustable stage to determine the position of the ROC and the optics surface under test. Alternatively, a spherometer or a profilometer are used...
Briefs: Physical Sciences
A²⁰¹Hg⁺ Comagnetometer for ¹⁹⁹Hg⁺ Trapped Ion Space Atomic Clocks
A method has been developed for unambiguously measuring the exact magnetic field experienced by trapped mercury ions contained within an atomic clock intended for space applications. In general, atomic clocks are insensitive to external perturbations that would change...
Briefs: Physical Sciences
Fiber-Optic Magnetic-Field-Strength Measurement System for Lightning Detection
A fiber-optic sensor system is designed to measure magnetic fields associated with a lightning stroke. Field vector magnitudes are detected and processed for multiple locations. Since physical limitations prevent the sensor elements from being located in close proximity...
Briefs: Mechanical & Fluid Systems
Cryogenic Scan Mechanism for Fourier Transform Spectrometer
A compact and lightweight mechanism has been developed to accurately move a Fourier transform spectrometer (FTS) scan mirror (a cube corner) in a near-linear fashion with near constant speed at cryogenic temperatures. This innovation includes a slide mechanism to restrict motion to one...
Briefs: Electronics & Computers
High-Performance Wireless Telemetrye
Prior technology for machinery data acquisition used slip rings, FM radio communication, or non-real-time digital communication. Slip rings are often noisy, require much space that may not be available, and require access to the shaft, which may not be possible. FM radio is not accurate or stable, and is limited...
Briefs: Photonics/Optics
Method for Implementing Optical Phase Adjustment
A method has been developed to mechanically implement the optical phase shift by adjusting the polarization of the pump and probe beams in an NMOR (nonlinear magneto-optical rotation) magnetometer as the proper phase shift is necessary to induce self-oscillation. This innovation consists of mounting...
Briefs: Mechanical & Fluid Systems
A proposed apparatus for generating hydrogen by means of chemical reactions of magnesium and magnesium hydride with steam would exploit the same basic principles as those discussed in...
Briefs: Manufacturing & Prototyping
Process To Produce Iron Nanoparticle Lunar Dust Simulant Composite
A document discusses a method for producing nanophase iron lunar dust composite simulant by heating a mixture of carbon black and current lunar simulant types (mixed oxide including iron oxide) at a high temperature to reduce ionic iron into elemental iron. The product is a...
Briefs: Electronics & Computers
Magnetic field response sensors are a class of sensors that are powered via oscillating magnetic fields, and when electrically active, respond...
Briefs: Electronics & Computers
Differential Resonant Ring YIG Tuned Oscillator
A differential SiGe oscillator circuit uses a resonant ring-oscillator topology in order to electronically tune the oscillator over multi-octave bandwidths. The oscillator’s tuning is extremely linear, because the oscillator’s frequency depends on the magnetic tuning of a YIG sphere, whose...
Briefs: Software
Dayside Ionospheric Superfountain
The Dayside Ionospheric Superfountain modified SAMI2 code predicts the uplift, given storm-time electric fields, of the dayside near-equatorial ionosphere to heights of over 800 kilometers during magnetic storm intervals. This software is a simple 2D code developed over many years at the Naval Research Laboratory,...
Briefs: Physical Sciences
Universal Millimeter-Wave Radar Front End
A quasi-optical front end allows any arbitrary polarization to be transmitted by controlling the timing, amplitude, and phase of the two input ports. The front end consists of two independent channels — horizontal and vertical. Each channel has two ports — transmit and receive. The transmit signal is...
Briefs: Physical Sciences
A system for wirelessly measuring the volume of fluid in tanks at non-horizontal orientation is predicated upon two technologies developed...
Briefs: Physical Sciences
An improved magnetic levitation apparatus (“Maglev Facility”) has been built for use in experiments in which there are requirements to impose variable gravity (including zero gravity) in order...
Briefs: Mechanical & Fluid Systems
A proposed direct-current electromagnetic pump for circulating a molten alkali metal alloy would be smaller and lighter and would demand less input power, relative to currently...
Briefs: Physical Sciences
Sensors for monitoring surface wear and/or temperature without need for wire connections have been developed. Excitation and interrogation of these sensors are accomplished by means of a...
Briefs: Physical Sciences
The temperature dependence of fluxoid quantization in a superconducting loop. The sensitivity of the device is expected to surpass that of other super-conducting-based bolometric devices, such as...
Articles: Motion Control
In this age of environmental consciousness, OEMs around the world are competing to build better, safer, and greener machines. In striving toward such lofty goals, many industries are rediscovering a fundamental...
Application Briefs: Medical
BioConnect® bag and tubing assemblies Cole-Parmer Instrument Vernon Hills, IL 800-323-4340 www.coleparmer.com
BioConnect custom bag and tubing assemblies supplied the materials and...
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Webcasts
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