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Acoustic resonances in gas-filled spherical bulb with parabolic temperature profile
John P Koulakis1, Seth Pree1, Seth Putterman1
1Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA.
Abstract:
Acoustics is used to probe the temperature profile within a sulfur plasma lamp. A spherically symmetric temperature profile is assumed that drops with the square of the radius, consistent with a constant volumetric heating model. Acoustic resonance frequencies are calculated exactly in the case of an ideal gas. Experimental measurement of a few resonant frequencies allows determination of the temperature profile curvature. This technique can be viewed as an extension of ultrasonic resonant spectroscopy to systems that are highly non-uniform due to off-equilibrium energy flow.
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