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Small Strength



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Current Attractions

Each month, NTB highlights tech briefs related to a particular area of technology in a special section called Technology Focus. Here are some of the technologies featured in the October issue focus on Sensors. Wirelessly Interrogated Position or Displacement Sensors Researchers at NASA's Langley Research Center have developed two simple position or displacement sensors based on inductance-capacitance resonant circuits. The sensors are both powered and interrogated wirelessly, and without making contact with other objects. Their mode of operation doesn't depend on maintenance of environmental conditions, so they can be used in harsh conditions such as cryogenic temperatures and radioactivity. (Page 20)

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Techs of the Week

The Jettison D® is an ionizer that works in conjunction with a diesel engine's emission control system to decrease the amount of pollutants emitted while improving fuel economy, reducing maintenance, and enhancing engine performance. It changes unburned oil droplets and vapors emitted from the engine into light, burnable hydrocarbons and returns them to the engine's intake manifold to be burned. The small size, light weight, and easy installation make it suitable for use on a wide range of diesel engines. Click here for more info.

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High-Tech Helmets



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Coming Attractions

This monthly review lets you "meet" the new advertisers appearing in Defense Tech Briefs (DTB). Here's a sneak peek at the products, services, and offers available from October's first-time advertisers. AVX Corp. (Myrtle Beach, SC) offers products for defense, aerospace, and space applications, including ceramic capacitors, resistors, filters, integrated passive components, timing devices, and connectors.

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Using Ethernet for Process Automation

The use of Ethernet communications in industrial applications is growing because it enables the real-time exchange of information between processing equipment and companies' Ethernet-based management systems. Some of the factors encouraging the use of Ethernet technology include: the speed advantages over lower baud rate protocols the number of tools available for troubleshooting and optimizing a network, the broad base of competitive vendor support and solution options and the large pool of trained personnel who are familiar with the technology. In addition, the ability to bridge existing proprietary communications schemes makes it possible to phase in the use of Ethernet rather than having to replace everything at once.

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Opto-Electronic Oscillator Using Suppressed Phase Modulation

Phase noise would be much lower than in prior OEOs. A proposed opto- electronic oscillator (OEO) would generate a microwave signal having degrees of frequency stability and spectral purity greater than those achieved in prior OEOs. The design of this system provides for reduction of noise levels (including the level of phase noise in the final output microwave signal) to below some of the fundamental limits of the prior OEOs while retaining the advantages of photonic generation of microwaves. Whereas prior OEOs utilize optical amplitude modulation, this system would utilize a combination of optical phase modulation and suppression thereof. The design promises to afford, in the opto-electronic domain, the low-noise advantages of suppression of carrier signals in all-electronic microwave oscillators.

Posted in: Information Sciences, Briefs

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