 Applied Acoustics Lectures 12–14 by Peter H. Dahl

Author lecture notes, University of Washington: oalib-acoustics.org/website_resources/xxeducation/ME525_2024/Lectures%2012-13-14.pdf

Lecture 13, printed pp. 6–8 (PDF pp. 15–17), distinguishes hydrodynamic and geometric near/far fields. Lecture 14, printed pp. 1–3 (PDF pp. 19–21), derives the Fraunhofer distance expansion and aperture Fourier transform, with quadratic phase error k L squared/(8 r). Lecture 14 retains a Winter 2022 heading; the compilation footer is 2024. Names and affiliation verified on the lecture title pages.