Abstract
Nonlinear interaction between high and low frequency sound fields in water has long been modeled as phase modulation of the higher frequency by the lower frequency. For the modulation indices usually predicted, this implies the generation of side bands symmetric about the higher frequency having equal amplitudes but opposite phases. Simultaneous but independent measurements of the sidebands resulting from the interaction of a 65-kHz signal with low frequency signals from 100 Hz to 1 kHz now permit a direct comparison of the side bands for verification of the theory. Results are given for various frequencies, sound levels, and interaction geometries. [This research was supported by the Advanced Research Projects Agency of the Department of Defense and was monitored by the Naval Electronic Systems Command under Contract N00039-76-C-0231.]
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