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Articles RF & Microwave Electronics
System Could Detect Concealed Person-Borne Bombs at a Distance
The recent tragic events at the Boston Marathon illustrate the growing and critical need for the detection of person-borne improvised explosive devices (PBIEDS). Such systems, in...
Articles Aerospace
Point-of-Load Power Management
The requirements for smaller size, lower weight, and reduced cost in space and defense systems are driving demands for improved power-management solutions. Integrated DCto- DC converters that are designed for...
Articles Electronics & Computers
Tips for Selecting or Designing a Membrane Switch
Membrane switches are known for standing up to tough environmental conditions. Flexible and durable, the membrane switch can be customized with embossing, backlighting, sealing, and...
Articles RF & Microwave Electronics
Simulation Optimizes Safety and Performance When Integrating an Antenna Onto a Platform
Successful integration of an antenna onto a vehicle platform poses many challenges. Vehicle features impact antenna performance by blocking, reflecting, or...
Briefs Information Technology
Thermal-to-Visible Face Recognition
For nighttime surveillance, acquisition of visible light imagery is impractical due to the lack of illumination. Thermal imaging, which acquires mid-wave infrared or long-wave infrared radiation naturally...
Briefs Physical Sciences
Component Identification in Multi-Chemical Mixtures with Swept-Wavelength Resonant-Raman Spectroscopy
The utilization of ultraviolet resonance Raman spectroscopy for the detection and identification of chemical, biological, and nuclear hazards is of great interest due to the sensitivity and specificity afforded by this technique. Detection by means...
Articles RF & Microwave Electronics
Expanding the Use of Aerial Downlinks
Today, airborne downlinks are no longer limited to strategic command applications. More and more, first responders, fire departments, EMS personnel, and others are employing airborne downlinks to meet a...
Articles RF & Microwave Electronics
An Advanced Circuit Protection Approach for RF Interfaces
One aspect that sets circuit protection for radio frequency (RF) apart from other types of applications is the range of frequencies in which RF circuits operate. With abbreviated clock...
Briefs Physical Sciences
Nonlinear Acoustic Metamaterials for Sound Attenuation Applications
An acoustic crystal composed of tightly packed spherical particles can exhibit a wide spectrum of acoustic properties with responses varying from linear to highly nonlinear...
Articles RF & Microwave Electronics
Using Modeling and Simulation to Assess Antenna Performance During Vehicle Platform Integration
Successful integration of an antenna onto a vehicle platform poses many challenges. Vehicle features impact antenna performance by blocking,...
Application Briefs RF & Microwave Electronics
Impact of Materials on Microwave Cable Performance
The environments in which microwave cable assemblies are being used today are becoming more challenging with exposure to such conditions as extreme temperatures, chemicals, abrasion, and...
Briefs Photonics/Optics
Room-Temperature Sub-Diffraction-Limited Plasmon Laser
Lasers present the means to deliver powerful, coherent, and directional high-frequency electromagnetic energy. However, the diffraction limit of light imposes fundamental constraints on how...
Articles Aerospace
Automating Radiation Effects Mitigation with FPGA Synthesis
FPGA designers of aerospace and defense applications have long wrestled with radiation effects. More recently, due to shrinking technology nodes, concerns have arisen about...
Briefs Photonics/Optics
Surface Plasmon-Enhanced Si:Er Infrared Light-Emitting Diodes
Plasmons are collective oscillations of the free electrons in a metal or an ionized gas. Plasmons dominate the optical properties of noble-metal nanoparticles, which enables a variety of applications including electromagnetic energy transport at nanoscale dimensions, single-molecule...
Articles RF & Microwave Electronics
Microwave Energy Transmission for Aircraft
Unmanned aerial vehicles, or UAVs, are used in many applications to gather intelligence without risking human lives. These aircraft, however, have limited flight time because of their reconnaissance...
Briefs Materials
Fire Resistance of Geopolymer Concretes
Geopolymer concrete has been proposed as an alternative to Portland cement concrete in applications requiring high degrees of fire resistance, because the intrinsic chemistry of the geopolymer binder does...
Briefs Physical Sciences
Uncooled Tunable LWIR Microbolometers
Uncooled infrared detectors have significant potential capabilities that have been little explored. Micro-machined uncooled detectors with tunable spectral characteristics across the long-wave infrared...
Articles Data Acquisition
CAT Scanner Provides 3D View Inside Nuclear Weapon Components
The Department of Energy’s (DoE) National Nuclear Security Administration (NNSA) is pursuing a smaller, safer, more secure, and less expensive nuclear weapons complex. Meeting that...
Briefs Photonics/Optics
Power Enhancement of a Rubidium Vapor Laser with a Master Oscillator Power Amplifier
The concept of alkali lasers was first suggested by Schalow and Townes in the late 1950s. In the 1970s, photo-dissociation of several of the alkali salts produced lasers with wavelengths ranging from the visible to the far infrared. Thirty years later, diode-pumped...
Briefs Electronics & Computers
Low-Power Circuit for an Electromagnetic Warning System Sensor
Low-power sensors are important to the Army for monitoring infrastructure of the lifecycle of an operation. Isotope batteries can power and operate compact, low-power sensors for...
Briefs Materials
RF Polymer Composites for Electromagnetic Systems
Design of polymer composites with specific engineered electromagnetic properties are of use in a variety of physical electromagnetic systems above 100 MHz. In physical electromagnetic systems such as GPS, radomes, WiFi, etc., proper choice of the material can be transformative in that it can yield...
Briefs Physical Sciences
Imaging and Spectral Measurements of Explosions
A document describes experiments performed to investigate rates of delivery of energy onto targets from different explosive formulations. The experiments were designed to measure relative positions of blast fireballs and leading shock fronts; determine whether different explosive formulations exhibit...
Briefs Electronics & Computers
Heterogeneous System-on-a-Chip for Self-Powered Wireless Sensor Networks
A new dimension of system architecture design is emerging where hundreds to thousands of ultralight (
Briefs Electronics & Computers
Asynchronous Architectures for Large-Integer Processors
New architectures have been developed for cryptographic hardware that offer high throughput, algorithm flexibility, radiation hardness, and low power. The asynchronous (clockless) architecture combines a dedicated large-integer processor (LIP), a field programmable gate array (FPGA), and a...
Briefs Mechanical & Fluid Systems
Water Mist System for Shipboard Machinery Space Fires
Water mist has been determined to be a preferred alternative to Halon 1301 total flooding to extinguish fires occurring in ship machinery spaces and pump rooms, because it is toxicologically...
Articles Sensors/Data Acquisition
Man-Wearable Control Units for Military Robotics
It is no secret that robots are rapidly asserting themselves in today's military applications. For the duration of the Iraq War, robots have roamed the streets of Baghdad, Fallujah, and other...
Briefs Electronics & Computers
Effects of High-Power Microwave Pulses on Electronic Systems
A five-year program comprising several coordinated research efforts was devoted to increasing understanding and developing capabilities for computational modeling of the effects of...
Briefs Materials
Electrochromic Devices for Controlling Infrared Emissivity
Electrochromic devices that exhibited adjustable infrared emissivity were developed in a research program that was part of a larger effort to develop adaptive infrared camouflage....
Briefs Physical Sciences
Detecting Explosives by Use of LIBS
Laser-induced breakdown spectros - copy (LIBS) has been investigated for potential utility as a means of detecting trace amounts of chemical explosives and residues thereof in lawenforcement, forensic...
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