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Piezoelectric Crystals

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Piezoelectric Crystals Powered By Docstoc
					    MEEN 3344
By: Matthew Kelso
   Crystals that generate a
    voltage when a stress is
    applied to them.
   The inverse effect is also
    true: a voltage causes
    deformation.
   This is due to complicated
    crystal structure that is
    unsymmetrical about the
    center.
   In these crystals, the positive
    and negative charges are
    separated, but symmetrical.
   When a stress is applied, the
    symmetry is disrupted and
    there is an uneven charge
    distribution.
   This uneven distribution
    generates a voltage across the
    system.
 Quartz is the most
  commonly used crystal.
 Natural Crystals: Quartz,
  Rochelle Salt, Topaz, Cane
  Sugar, Bone
 Some ceramics
 Polyvinylidene Fluoride
  (PVDF)
 Vibration
  Dampeners
 Energy farm
 Quartz Watches
 Guitar Pickups
 Lighters
 Sonar
 Phonographs
 Printers
   http://www.piezo.com/tech4history.html
   http://en.wikipedia.org/wiki/Piezoelectricity
   http://openlearn.open.ac.uk/mod/resource/view.php?id=257278
   Callister, W.D., Fundamentals of Materials Science and Engineering: An Integrated Approach,
    3rd ed. Wiley and Sons, 2008, Online
   http://www.treehugger.com/files/2006/08/japan_ticket_gates.php
   http://www.answers.com/topic/piezoelectricity
   http://www.slashgear.com/gibson-powertune-the-guitar-that-tunes-itself-047793/
   http://gemscollection.blogspot.com/2007/08/topaz-gemstone.html
   http://www.handsofhopedisasterreliefservices.org/b2b/confectionery_and_candy/1/
   http://flickr.com/photos/14833125@N02/2182032919
   http://www.mineralminers.com/images/phantom-quartz/polx/phqp271.jpg
   http://www.filterforge.com/filters/4802.html
   http://www.phonodoc.com/phono.htm
   http://www.global-b2b-network.com/b2b/26/37/858/157887/piezo_igniters.html
   http://en.wikipedia.org/wiki/Inkjet_printer
   http://www.explainthatstuff.com/insidequartzwatch.jpg

				
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posted:11/12/2011
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