Development of a system for acoustic measurements of bistatic target strengths

Abstract

A digital data acquisition system was implemented for the study and collection of scattered waveforms from various objects. Reflected waveforms were extracted from interference with other signals by a simple subtraction technique. Backscattered and bistatic reflections were observed and and recorded. Various effects on scattered waveforms, including target composition, pulse length, and frequency, were experimentally observed. Bistatic scattering results from a styrofoam sphere at a ka value of 10 were in agreement with theoretical predictions for a rigid sphere. Bistatically measured data at 70 kHz from a styrofoam cylinder of length 20 cm and diameter 2.5 cm followed a trend for bistatic angles up to 150 degrees but became amorphous as the bistatic angle approached 180 degrees. Keywords include: Bistatic target strength, and Sound scattering. Theses