Stott Abstract Applications of the Causality Condition to Acoustic Sensing in Noisy Environments Prof. J. Gregory McDaniel, Boston University Acousticians often sense the dynamics of submerged objects and sediments by ensonifying them with short pulses and examining the reflected sound in the frequency domain. However, inhomogeneities in the acoustic medium as well as ambient noise conspire to corrupt the phase of the reflection coefficient while its magnitude is relatively unaffected.
Analogous difficulties occur in biomedical ultrasound and electromagnetic imaging.
This lecture will describe a methodology for overcoming these difficulties using the causality condition. In particular, the reflection coefficient phase is reconstructed from its magnitude using frequency-domain causality relationships. The methodology will be demonstrated on simulation data and on a rich set of experimental data from the Naval Research Laboratory.