Airway Area by Acoustic Reflection: A Corrected Derivation for the Two-Microphone Method

[+] Author and Article Information
K. L. Poort

Harvard University-Massachusetts Institute of Technology, Division of Health Sciences and Technology, and Research Laboratory of Electronics & Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Rm. 36-587, 50 Vassar St., Cambridge, MA 02139

J. J. Fredberg

Harvard School of Public Health, Physiology Program, Department of Environmental Health, 665 Huntington Avenue, Boston, MA 02115-6021

J Biomech Eng 121(6), 663-665 (Dec 01, 1999) (3 pages) doi:10.1115/1.2800872 History: Received April 30, 1998; Revised June 03, 1999; Online October 30, 2007


A corrected derivation is provided for the relationship between the impulse response of a wave tube termination and pressure signals measured at two different locations within the tube. This derivation yields exactly the same final result as was reported previously by Louis et al. (1993), despite the omission of the active source term in that earlier derivation. This technique has become the basis of an important medical diagnostic technology. This report revises and corrects the earlier theory upon which that technology rests.

Copyright © 1999 by The American Society of Mechanical Engineers
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