A Resonance Tube Apparatus for Absorption Measurements

摘要

A theoretical model of atmospheric absorption of sound previously has been proposed which more accurately accounts for molecular relaxation of the various constituents in air. Rate constants for these relaxation processes in binary gas mixtures and the concentration of each component are required in the calculations than room temperature, it is necessary to know these rate constants as a function of temperature. Such information can be extracted from sound absorption measurements with binary gas mixtures at various temperatures. This report presents preliminary information the design of an experimental program directed towards obtaining these rate constants by sound absorption measurements at low frequencies. The study is part of a continuous basic research program on sound absorption in air. (Author)