Transfer matrix modeling of a recessed microphone for unsteady surface pressure measurements

摘要

Recessed microphones are commonly used for unsteady surface pressure measurements, either due to space limitations or to satisfy performance requirements. A technique is developed using transfer matrices to design a configuration by modeling its frequency response. This.technique is beneficial since it provides guidance to optimize the recessed configuration prior to fabrication. The recessed nature also allows for utilization of closely-spaced pressure ports on a surface, thus providing an inexpensive means for measuring unsteady surface pressures with high spatial resolution. A tube-branch design capable of achieving a 10-kHz bandwidth is presented and validated experimentally using an acoustic plane wave tube. Published by Elsevier Ltd.