Acoustic measurement of aerosol particles

Abstract

Measurements of the motion of aerosol particles in an acoustic field were made on particles covering two orders of magnitude (0.3 μm–30 μm) in diameter and one order of magnitude in density. The measurements of both velocity magnitude and phase agree well with the theoretical model presented by König in 1891. As a result, the diameter and the density of spherical aerosol particles can be determined simultaneously from the measurement of the particle velocity. The phase and magnitude of the acoustic velocity can be determined by indirect methods, allowing particle sizing to be performed without the use of precision particles for calibration standards. © 1993 Elsevier Science Publishing Co., Inc.