Effects of Phase Cancellation on the Scattering Measurements.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
Pagination or Media Count:
Piezoelectric transducers are used for converting between electrical energy and acoustic energy in such diversified fields as medical imaging, underwater acoustic propagation, and non-destructive material testing. This type of transducer when used as a receiver is sensitive to the phase of the received pressure wave. The effect of phase cancellation on the measurements of attenuation coefficients of heterogeneous materials with piezoelectric transducers has been studied extensively. However, the fact that the phase cancellation effect may also produce considerable error in scattering measurements has only recently been recognized. In this thesis, a mathematical model for interpretation of error arising from the phase cancellation effect on backscattered waves is developed. Computer simulation has been performed to elucidate the influence of phase cancellation on the average received pressure in terms of transducer aperture size, number of scatterers, target range and frequency for five different scattering configurations a single point scatterer linear, rectangular and random arrays and random volume distributions of point scatterers. Author
- Acoustic Detection and Detectors