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Forced Air-Cooled Enclosure

Extreme Engineering Solutions (X-ES) (Middleton, WI) is now shipping the XPand4200, a sub-1⁄2 ATR, forced air-cooled enclosure for conduction-cooled modules. The system measures 4.88" (W) × 6.0" (H) × 13.5" (D) and weighs 8.8 pounds. The XPand4200 has an optional removable memory module attachment that supports the XPort6191 Solid State Disk (SSD) removable storage module, with 64 GB of storage capacity. With the memory module attachment the height increases to 7.62" and the weight to 11.1 pounds. Up to six conduction-cooled, 0.8" pitch 3U VPX, 3U cPCI, or power supply modules can be configured into the XPand4200. Additionally, the XPand4200 can be configured to meet custom I/O requirements with conduction-cooled PMC / XMC modules available from X-ES or third parties.

Posted in: Products, Open VPX, Products, Electronics & Computers
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Two-Slot OpenVPX Development Platform

Elma Electronic Systems Division (Fremont, CA) has released a new two-slot VPX/OpenVPX test and development platform that accommodates both 3U and 6U boards via a shelf divider. The new E-Frame Series enables developers to power up one or more VPX blades under test and interconnect the J1 fabric connections to emulate the user’s application. The use of a standard VPX RTM (rear transition module) plugged into the back provides access to the J0, J2, J3, J4, J5 and J6 connectors, while simultaneously accessing high-speed signals in the J1 connector, routed out the side of the backplane. Each slot’s J1 “A” channel is broken out into 16 SMA connectors and the “B”, “C” and “D” channels into four SATA2 cable headers (12 total per slot).

Posted in: Products, Open VPX, Products, Electronics & Computers
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IPv4/IPv6 Gigabit Ethernet Switch

The new Kontron (Poway, CA) Gigabit Ethernet Switch VX3910 offers 3U VPX (VITA 46.x) and OpenVPX™ (VITA 65) platforms enterprise-class switching functionality with a total of 28 Gigabit Ethernet ports and advanced management features. The non-blocking fully managed L2/L3 Gigabit switch, Kontron VX3910, with its 20x Gigabit ports to the backplane, offers the highest port density for the implementation of various network topologies in 3U appliances. Four additional 2.5-Gigabit ports to the backplane simplify a redundant system architecture with multiple switches with no single point of failure. The four 1000 Base-T uplinks on the front panel, one dedicated for out-of-band management, expand the range to a total of 28 ports. The new Kontron Gigabit Ethernet Switch VX3910 is available in an air-cooled version for ambient temperatures from 0°C to +55°C and in a rugged conduction-cooled version for the extended temperature range from -40°C to + 85°C.

Posted in: Products, Open VPX, Products, Electronics & Computers
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Outdoor Synthetic Aperture Acoustic Ground Target Measurements

A novel outdoor synthetic aperture acoustic (SAA) system consists of a microphone and loudspeaker traveling along a 6.3-meter rail system. This is an extension of a prior indoor laboratory measurement system in which selected targets were insonified while suspended in air. Here, the loudspeaker and microphone are aimed perpendicular to their direction of travel along the rail. The area next to the rail is insonified and the microphone records the reflected acoustic signal, while the travel of the transceiver along the rail creates a synthetic aperture allowing imaging of the scene.

Posted in: Briefs, Physical Sciences, Measurements, Acoustics, Test equipment and instrumentation
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Portable, Rapid-Test Fuel Tank Leak Detection System

In 1988, the EPA issued Underground Storage Tank (UST) regulations for fuel storage in order to implement monthly monitoring and annual tightness testing. Monthly monitoring requires that the leak detection system be certified for a leak rate of 0.2 gallons per hour (GPH), and annual tightness testing requires a certified leak rate of 0.1 GPH, both with a probability of detection of at least 95%, and a probability of false alarm of no more than 5%. The DoD owns and operates hundreds of underground storage tanks that are less than 100,000 gallons. These tanks, commonly operating at base fuel farms, must comply with EPA, state, and local regulations, and require that either an annual tightness test with monthly inventory reconciliation or monthly monitoring tests be conducted in accordance with published performance standards. Existing technologies either cannot meet performance standards for the large 50-K to 100-K gallon USTs or do not provide a cost-effective solution. The Portable Rapid Test (PRT) is designed and recommended for testing tanks containing lower-volatile, heavier-type fuels such as diesel, JP-5, JP-8, etc.

Posted in: Briefs, Physical Sciences, Defense industry, Fuel tanks, Certification, Inspections, Test procedures
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Ballistic Filter for GPS and Accelerometer Measurements

Ballistic filtering describes the dynamic equations that can be used to form Extended Kalman Filters (EKF) for the estimation of a projectile’s trajectory. The steps associated with initialization and implementing an EKF are demonstrated through a specific task. The performance of an EKF processing Global Positioning System (GPS) observation is compared to the performance of an EKF processing both GPS and axial accelerometer observations. Hit point prediction error is used as the measure of effectiveness. Both filters use the same dynamics for state and covariance propagation.

Posted in: Briefs, Information Technology, Trajectory control, Mathematical models, Measurements, Global positioning systems, Global positioning systems (GPS), Military vehicles and equipment
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Procedure to Determine and Correct for Transmission Line Resistances for Direct-Current, On-Wafer Measurements

Resistances of tenths of ohms to several ohms in transmission lines have been measured in laboratory systems from the power supply to the device under test (DUT). High-current semiconductor devices may draw currents of several amps. In cases such as these, the voltage drop in the transmission lines may rise up to several volts. In order to properly characterize the DUT, the losses in the transmission line and the voltage drop across the line must be measured and accounted for. A procedure for measuring the transmission line resistances is described. Once these values are known, it is necessary to apply a transform to the raw measured data in order to determine the actual voltages on the device of interest. A simple MATLAB code for determining the DUT current and voltage behavior is presented when the raw IV data and the transmission line resistances are known.

Posted in: Briefs, Electronics & Computers, CAD / CAM / CAE, Measurements, Wiring, Semiconductors
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Channel Field Effect Transistors

Narrow bandgap semiconductors offer high carrier mobilities and low contact resistances, while wide bandgap semiconductors offer high breakdown voltages. A series of heterojunction transistors has been investigated and proved to be effective for improving both speed and power output. These devices include double heterostructure InP/InGaAs/InP bipolar transistors and composite-channel InAlAs/InGaAs/lnP/InAlAs high-electron-mobility transistors (HEMTs), which have taken full advantage of the matched lattice constant (or pseudomorphic growth).

Posted in: Briefs, Electronics & Computers, Architecture, Transistors, Semiconductors, Performance tests
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Self-Aware Computing

This project performed an initial exploration of a new concept for computer system design called Self-Aware Computing. A self-aware computer leverages a variety of hardware and software techniques to automatically adapt and optimize its behavior according to a set of high-level goals and its current environment. The heart of a complete self-aware system is a new “organic” operating system (OOS). The OOS acts as the ringleader, monitoring applications and making adjustments to hardware and software to increase performance, efficiency, and reliability automatically.

Posted in: Briefs, Electronics & Computers, Artificial intelligence, Computer software / hardware, Product development, Research and development
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Computational Photonics in Laser Communications Through Clouds

This work explored the concept of creating a partially coherent laser beam consisting of an array of spatially overlapping or separated Gaussian beams with possible individual control of each individual emitter’s wavelength. The idea was to test whether such a transmitter array could propagate more effectively through weak or strong atmospheric turbulence. It was proposed that a versatile, multi-wavelength, multi-emitter configuration could be realized via an array of optically pumped, vertical external-cavity surface emitting semiconductor lasers (VECSELs).

Posted in: Briefs, Photonics, Lasers, Semiconductors, Test procedures, Turbulence
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