Application Briefs

Vibration Sensors Monitor Engine Health in Latest Space Shuttle Launch

Model 7704M7 vibration sensors Endevco Corp. San Juan Capistrano, CA 949-493-8181 www.endevco.com On August 8, 2007, three Space Shuttle Main Engines (SSMEs) from Pratt & Whitney Rocketdyne lifted the space shuttle Endeavor into orbit and on its way to the International Space Station. The three SSMEs were fitted with Advanced Health Management (AHMS) controllers, using Endevco Model 7704M7 vibration sensors, to actively monitor engine health and performance.

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Signal Processing System Supplied For NASA’s SCaN Program

VXS-based satellite communications development system TEK Microsystems Chelmsford, MA 978-244-9200 www.tekmicro.com TEK Microsystems’ first VXS-based satellite communications development system has been ordered by NASA’s Glenn Research Center in Cleveland, OH. The system will be used for Tracking and Data Relay Satellite System (TDRSS) compatibility test sets as part of NASA’s Space Communications and Navigation (SCaN) Program. Responsible for providing communications and navigation services to flight missions, the SCaN Program also supplies terrestrial communication needs.

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Improving Lens Performance With Transmitted Wavefront Error Testing

During design and manufacturing, optical systems and lenses are toleranced and tested to ensure the smallest possible performance error. Matching most optics manufacturing companies’ capabilities, lenses are traditionally toleranced with individual surface specifications — surface power and irregularity, or form, error. These tolerances and the associated tests control performance of a single surface, not the entire lens. Because lens designs are built around transmission characteristics such as spot size and RMS wavefront error, the performance of the entire lens, not the individual surfaces, is the true target. Transmitted wavefront error (TWE), which is the error in transmission of light through a lens, is the true target. For aspheric surfaces, traditional single-surface, three-dimensional surface form metrology is not easy. Aside from testing the true target, it may be easier and faster to make use of TWE for aspheric lenses. Using innovative metrology and developing a feed-forward manufacturing strategy, tolerancing and testing TWE can reduce risk in optical designs, improve performance and reduce cost and lead time.

Posted in: ptb catchall, Applications, Photonics, Application Briefs

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Brake System Development Accelerated With 3D Modeling

Tractair Ltd., based in Brough, UK, designs, manufactures and installs air and hydraulic brake systems for special applications. The company works closely with the design engineers of major international tractor manufacturers and other OEMs to ensure that the braking systems are fully integrated. The company has been closely involved in the development of air brakes for agricultural and other off-road vehicles since 1985 and continues to adapt available technologies to meet the demands of increasing loads and speeds handled by agricultural and construction vehicles, both on and off the highway.

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Motor System Enables Elevators to Ride Smoothly

Many factors have contributed to the fact that in the past five years, home elevator sales have doubled. These include the aging of the affluent baby-boom generation. In the next five years, an estimated 70 million people will be of retirement age; many of them will be looking at retaining their independence by staying in their own homes and adding features such as elevators to make living more accessible, or moving to customized homes that already include such advantages. According to a Florida State University study, a home elevator can add 10% to the selling price of a home.

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Spectrometer Selected for NASA Mission to Search out Lunar Water

QE65000 spectrometer Ocean Optics Dunedin, FL 727-733-2447 www.oceanoptics.com Scheduled to launch from NASA’s Kennedy Space Center (KSC) in Florida in October of 2008, the LCROSS (Lunar Crater Observation and Sensing Satellite) mission will venture to the Moon’s south pole. The mission will carry equipment from Ocean Optics named ALICE to help analyze the makeup of the lunar craters, with the goal of locating water below the Moon’s surface. The LCROSS mission will send a rocket crashing into the Moon at twice the speed of a bullet in order to study the resulting ejecta cloud. The impact is expected to generate a 2.2-million-pound plume of matter, which another spacecraft carrying ALICE will fly through, looking for signs of water and other compounds. Measuring the reflectivity of the plume, ALICE will enable scientists to distinguish between water vapor, water ice, and hydrated minerals with molecularly bound water.

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NASA Advanced Life Support Systems Group Uses Water Reclamation Prototype

DynaJets® and DynaSwirl® cavitating jet technologies DynaFlow Jessup, MD 301-604-3688 www.dynaflow-inc.com Water is a critical product of any life support system. An estimated 12,000 kg of expendables are required to sustain a single person in space for one year, of which water comprises 86%. It is therefore imperative that water be recycled in an efficient manner. Technology used on the International Space Station consisting of conventional physico-chemical processes has a water recovery efficiency of 80 to 90%. But the level of resupply and use of expendables remains too large for longduration remote space applications.

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