MEMs

Compact Superconducting Power Systems for Airborne Applications

In the development of future airborne megawatt-class power generation, it is important to minimize both the size and the weight of the system. The primary means of increasing the power density within the generator, as for all rotating machinery such as motors and alternators, is to maximize the magnetic flux density. This can be achieved by using a higher current-carrying capacity wire to increase the ampere-turns in the windings without adding more turns via a longer length of wire. This has already been accomplished through the incorporation of superconducting wire in magnetic resonance imaging (MRI) magnets used in the medical field.

Posted in: Briefs, Electronics & Computers, Avionics, Electric cables, High voltage systems, Magnetic resonance imaging (MRI), Semiconductors
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Development and Test of a Medium-Voltage Converter for Ocean Observatories

A critical component in regional-scale undersea power systems is the medium-voltage converter (MVC). The MVC is a DC-DC converter in the primary network infrastructure that receives a medium-voltage power input from the shore-based power feed equipment (PFE) via the telecom cable, typically at 1-10 KVDC, and provides down-conversion to one or more lower-voltage outputs, typically 300-600 VDC, to feed power to science nodes and instrumentation in the secondary network infrastructure.

Posted in: Briefs, Electronics & Computers, Architecture, Voltage regulators, Electric power, Marine vehicles and equipment
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Two-Phase Electronics Cooling for Vehicle Applications

Replacing many of the traditional mechanical power and control systems with electronic equivalents will enable significant improvements by reducing weight, lowering fuel usage, increasing design flexibility, and enhancing overall functionality. This trend is apparent in “drive-by-wire” and “fly-by-wire” system designs. The past few iterations of Army vehicle programs have focused on increasing the use of electrical systems throughout the vehicle for many of the same reasons. Some of these programs have focused on new fully hybrid vehicles, while others have looked at improvements that can be made to legacy systems.

Posted in: Briefs, Electronics & Computers, Electrical systems, Electronic equipment, Cooling, Hybrid electric vehicles, Military vehicles and equipment
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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 Raman spectroscopy, and photothermal cancer therapy. Plasmons also affect the spontaneous emission dynamics of optical emitters positioned in the vicinity of metal nanoparticles. The luminescence intensity can either be enhanced or quenched, depending on the geometry. Since the associated enhancements can potentially be several orders of magnitude, plasmon-enhanced luminescence is the subject of intense research. This project focused on plasmon-enhanced luminescence of silicon quantum dots (Si QDs) and optically active erbium ions. Both these emitters are compatible with silicon processing technology, and are therefore of great technological interest.

Posted in: Briefs, Photonics, Light emitting diodes (LEDs), Gases, Materials properties, Nanomaterials
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Fundamental Interaction Between Gold Nanoparticles and DNA

Quantum dots (QDs) and nanoparticles (NPs) are made of metal and/or semiconductor materials with diameters ranging from 5 to 100 nm. The properties of these nanomaterials, which depend on their size and the material they are made from, are usually completely different than the properties of their corresponding bulk materials. There may be anywhere from 1 to 1,000 electrons in a single QD, providing numerous possibilities for their opti-

cal and electrical properties.

Posted in: Briefs, Materials, Composite materials, Materials properties, Metals, Nanomaterials, Semiconductors
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High Critical Current in Metal Organic Derived YBCO Films

High-temperature superconducting (HTS) YBCO wire is a versatile technology for a number of military and commercial applications. However, anticipated military applications such as energy-dense electric propulsion systems (including motor and adjustable speed motor drives), directed-energy weapons (including the gyrotron magnet and power supply), and commercial applications such as motors, generators, transformers, and power transmission lines require improvement in the performance of such wires before these applications are broadly realized.

Posted in: Briefs, Materials, Electric cables, Materials properties, Industrial vehicles and equipment, Military vehicles and equipment
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Dense Transducer Array

A dense transducer array is an acoustic transducer with relatively high operational bandwidth. It includes a cable harness component that provides and organizes various conductors within piezocomposite substrates to form transducer arrays with minimum impact on electroacoustic performance. Several underwater sonar applications exist for high-frequency wideband transducer arrays having individual elements. In order to form and steer acoustic beams with an array of individual elements, the array elements must be spaced not more than one-half the acoustic wavelength at the highest frequency of interest. This implies, for square-shaped elements at least, that the elements' lateral dimensions are inversely proportional to frequency. Therefore, for fully populated radiating apertures, the number of elements increases exponentially as the spacing decreases.

Posted in: Briefs, Electronics & Computers, Electronic equipment, Acoustics, Marine vehicles and equipment
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ARM-Based 32-Bit MCUs

STMicroelectronics (Geneva, Switzerland) has announced that the roadmap for its breakthrough STM32 family of 32-bit MCUs based on ARM® Cortex-MT processor cores will include new devices centered on the Cortex-M4 and the Cortex-M0 cores from ARM. In addition, ST also announced the availability of its new STM32 F-2 series MCUs that unleash the performance of the Cortex-M3 core. The Cortex-M4 from ARM is an upwardly compatible version of the Cortex-M3, offering DSP instructions and a Floating Point Unit (FPU). The core will be used in new high-performance variants of STM32 products to be sampled in 2011. ST's new STM32 F-2 microcontroller series combines ST's advanced 90nm process technology with the company's innovative Adaptive Real-Time memory accelerator (ART AcceleratorT) to unleash the Cortex-M3 core's maximum processing performance.

Posted in: Products, Products, Electronics & Computers
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3-Axis Acceleration Sensor

Saelig Company, Inc. (Pittsford, NY) has introduced JoyWarrior24F14, a high-resolution USB-connected 3-axis acceleration sensor with 125μg sensitivity. The new USB-powered JoyWarrior24F14 offers acceleration resolution down to 125μg. JoyWarrior24F14 modules are based on a MEMS sensor and measure with 14-bit resolution in the ranges ±1g, ±1.5g, ±2g, ±3g, ±4g, ±8g, or ±16g, delivering 125 results per second. Because JoyWarrior24F14 enumerates and works as a joystick, accessing the data can be easily done via the operating system's joystick API without installing any specific drivers. The included software operates on Windows and MacOS X platforms and contains a configuration tool to set the sensor parameters, with tilt angle measuring, a calibration tool, and a simple data recorder. Small size (30 x 33 x 5mm) and a low mass (

Posted in: Products, Products, Electronics & Computers
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PCIe/104 Single Board Computer

Kontron (Poway, CA) has introduced the world’s first PCIe/104™ embedded single board computer (SBC) based on the Intel® Atom™ E600C processor series, pairing an Intel Atom E600 series processor with an Altera Field Programmable Gate Array (FPGA) in a single package. The Kontron PCIe/104 MICROSPACE(R) MSMST is equipped with the Intel Atom E600C processor series ranging up to 1.3 GHz with up to 2 GB onboard DRAM system memory. All components are validated for the extended temperature range from -40 °C to +85 °C. The power optimized Intel Graphics Media Accelerator (Intel GMA 600) with up to 128 MByte, 18/24 Bit LVDS and SDVO interface is integrated in the processor. Video signals are carried out by optional media boards for VGA or DVI. Optional SPDIF (out) and two analog stereo connections for line-out and mic-in take care of the high-definition audio signals.

Posted in: Products, Products, Electronics & Computers
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