A Two-Microphone Method for the Estimation of the Mode Amplitude Distribution in Multi-Mode Broadband Sound Field in Finite-Length Ducts with Mean Flow

摘要

This paper describes a new measurement technique that allows the model amplitude distribution to be determined in ducts with mean flow and reflection based only measurements of the two-point coherence made at the duct wall. The technique is primarily applicable to broadband sound field in the high frequency limit and whose mode amplitdes are incoherent. The techniaue makes the assumptiuon that the relative mode amplitude distribution is independent of frequency.