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Getting rid of bad vibrations
Date:3/18/2014

Whether you're looking at hairy spider legs, the alien-like faces of ants, or the spiky-looking surfaces of pollen a scanning electron microscope delivers high-resolution images that are rich in detail. But you can't get perfect images unless you protect the microscope from vibration. If someone walking across the room or an elevator going up and down between nearby floors makes the table shake, you're unlikely to get good results. The simplest way to quell vibrations is to put the microscope on a granite base a stone so heavy that it dampens vibrations occurring at high frequencies from two to three Hertz. Placing a microscope on granite will make it far less susceptible to interference, but not necessarily those vibrations occurring at lower frequencies. When scientists wish to protect sensitive measuring devices from interference, they turn to active damping or, more specifically, an isolation platform. Each of the platform's four integrated swivel-mount modules contains a sensor that measures any vibrations in all three directions and an actuator that counterbalances them in three dimensions.

More cost-effective and compact without compromising performance

Researchers at the Fraunhofer Institute for Structural Durability and System Reliability LBF in Darmstadt have now come up with the first vibration control table of its kind to incorporate function-integrated components. "So instead of using non-adjoining sensors and actuators that are built into the table legs, we have integrated these functional elements directly into the platform's mounting modules," says engineer Torsten Bartel from Fraunhofer LBF. This has the advantage of making the vibration control table considerably more streamlined and cheaper to produce. And practical tests have already shown that the system works. The table dampens interfering vibrations just as well as its traditional counterparts. From April 7-11, the scientists will present their pro
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Contact: Torsten Bartel
torsten.bartel@lbf.fraunhofer.de
49-615-170-5497
Fraunhofer-Gesellschaft
Source:Eurekalert  

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