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2011 AAPT Summer Meeting
July 30-August 3, 2011
Omaha, Nebraska

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AD02:

Dynamic Interferometric Measurements: Acoustical/Mechanical Resonators and Changing Magnetic Fields
  Location: SS 105
  Date: Monday, Aug.1
  Time: 8:30 AM -9:00 AM
  Author: Richard Peterson, Bethel University
703-292-4629, petric@bethel.edu
  Co-Author(s): Keith Stein
  Abstract: Physical optics combines with computational physics to make three experimental project areas especially rich in experimental breadth (optics, electronics, acoustics, fluid dynamics, along with structural and magnetic properties of materials), in addition to facilitating year-to-year student/faculty creativity. Stroboscopic holography techniques with a high (130 - 160) dB gas resonator allow real-time imaging of sound patterns at resonance as gas density variations impact the index of refraction and produce quantifiable fringe motions at pressure antinodes. A steel tuning fork is rich in torsional and transverse modes that yield to spectral analysis and computational FFT work with COMSOL. Stroboscopic holography produces quantifiable video images of these modes that may be compared to spectral and COMSOL predictions. Rapidly changing magnetic fields in a material produce Faraday-effect induced interferometric phase shifts between circularly polarized beams, and real-time fringe readouts can measure rapidly changing fields at the level of a few gauss in TGG.
  Footnotes: Supported in part by the MN NASA Space Grant and the Carlsen-Lewis Endowment at Bethel University.
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