The optical theorem is proven for impenetrable targets without using the method of stationary phase. The proof depends upon the divergence theorem, the Helmholtz representation of the scattered field, and the law of cosines.
CITATION STYLE
Kriegsmann, G. A. (2006). Alternate proof of the optical theorem for impenetrable targets. The Journal of the Acoustical Society of America, 119(1), 31–32. https://doi.org/10.1121/1.2139071
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