Abstract
A method is described for the measurement of the acoustic extinction cross section of an object underwater. Use is made of the forward-scattering theorem which directly relates the extinction cross section of an object to the quadrature component of the scattered field in the forward direction. In the measurement technique the forward-scattered field is separated from the incident field by a simple cancellation process. The extinction cross section of a number of spheres and discs have been measured and the results are shown to be in good agreement with theoretical predictions. It is anticipated that this measurement technique could be extended to irregularly shaped bodies, such as fish.
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