Correlation and pulse techniques for identification of the paths of diffracted and penetrating waves through barriers

Abstract

This paper presents a theoretical analysis and the results of measurements aimed at distinguishing in the total energy transmitted by the barrier, the energy of a wave penetrating the barrier due to its limited insulation and the energy of a wave diffracted at the edge of the barrier. Correlation and pulse techniques have been used in the investigation, to com¬pare the resolution of the two methods for chosen kinds of acoustic signals, i.e. for band noise in the correlation method and for a pulse produced by a spark source in the pulse method. The calculated uncertainty products were the basis for the comparison of resolution agreement between the two methods.