Abstract
Angular dependence of sound transmission through airborne plates, at frequencies above their critical frequencies (supercritical), is discussed. Experimental measurements of this angular dependence have been conducted using phased array methods. Theory governing the sound transmission through supercritical plates is already well developed; however, experimental results are known to depart from theory near grazing incidence. The details of the measurement apparatus and issues involved in making this type of measurement will be discussed. The results of the measurements will be compared to theory, focusing on the departure of experiments from theory.
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