Direct Absolute Measurement of Acoustic Impedance

Publisher Website
Google Scholar
Abstract
The uniqueness of this method of measuring acoustic impedance (ratio of pressure to volume-current, lies in the fact that it involves the measurement of no other mechanical impedance, such as that of a telephone diaphragm. The computations involve values of the acoustic frequency and of the density of an sound velocity in the medium (air in this instance), and these are assumed to be known with sufficient accuracy. The only observations actually made are the readings of a centimeter scale and of relative resistances, and the disappearance of audible intensity. All measurements can thus be referred to units of mass, length and time. The method is based upon the knowledge of the effect of acoustic impedance upon the incident wave when inserted as a branch of an acoustic conduit.

This publication has 4 references indexed in Scilit: