In order to determine the effects of low frequency underwater sound on small animal models, it is desirable to expose them to well characterized fields which closely simulates the (locally) plane wave open ocean stimulus. It is also desirable to produce pure pressure and acceleration stimuli to isolate the effects of the individual components of the acoustic p]ane wave. It is necessary to produce sufficiently strong signals to enable damage thresholds to be determined. The range of frequencies over which such stimuli must be produced is quite broad since it must include the actual band of interest (100-500 W) to examine damage on the cellular and tissue level. as well as at scaled frequencies (-l-5 W) to examine the effects of organ structure. The problem is subtler than one might imagine because of the high compliance of the test animals due to the high compliance of the test animals due to air in their lungs. Careful consideration is required to ascertain what is required of the chamber to assure valid measurements and to determine the true effective sound pressure level.
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