AN EXPERIMENT WHICH MEASURES RESONANT MODE CONVERSION IN He II
Domain: Physics
The results of an experiment to observe the non-linear conversion of second sound to first sound within a waveguide are described. The non-linear term which dominates the coupling between the two modes arises from the Galilean invariant ([MATH])2. Measurements show that the resonant mode conversion occurs precisely at the predicted frequency. Unique procedures were used to get absolute calibration of the first sound transducers and using these calibrations we find the amplitude of the mode converted first sound has its theoretically predicted value.
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The results of an experiment to observe the non-linear conversion of second sound to first sound within a waveguide are described. The non-linear term which dominates the coupling between the two modes arises from the Galilean invariant ([MATH])2. Measurements show that the resonant mode conversion occurs precisely at the predicted frequency. Unique procedures were used to get absolute calibration of the first sound transducers and using these calibrations we find the amplitude of the mode converted first sound has its theoretically predicted value.
Article published online by
EDP Sciences
and available at
http://dx.doi.org/10.1051/jphyscol:19786101
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Publié le :
29/06/2012
Langue :
Français
Nombre de pages :
2
Type de la publication :
Rapports et thèses
Thème :
Savoirs >
Science de la nature
Source :
Journal de Physique Colloques
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