Diffuse Reflection : Scattered incoherent reflections caused by rough surfaces or associate interface reflections of ultrasonic waves from irregularities of the same order of magnitude or greater than the wave length. (RP 2X)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}