Abstract of the paper ``Acoustic microscopy of rough surfaces'' with Brian P. Bonner and Steven E. Benson

We have examined water-saturated lightly sintered packs of nearly spherical glass particles with nominal radii (a) ranging from ~30 to ~110 micrometers over a wide frequency range (21-90 MHz) with the focused reflecting acoustic microscope (FRAM). We therefore can compare back scattered images for a wide range of 2(pi)a/lambda, from ~5 to 30, where lambda is the wavelength of the incident wave. The images are digital, and are analyzed with image processing techniques. Assuming that the bulk porosity is representative of the imaged surface, two and three-point spatial correlation functions can be computed from the FRAM data. We then compare these measurements qualitatively to exact calculation results for arrays of impenetrable spheres.

Electronic copies of this paper are not available.