title: Diffraction effects in hydrophone measurements.
abstract: Theoretical and experimental methodology are presented for accurately determining the effective radii of unfocused, circular plane piston transducers as well as using tone burst hydrophone measurements to verify steady-state theoretical calculations. Experiments using two specially fabricated unfocused, composite piezoelectric transducers demonstrate the validity of the methodology. For spherically focused circular transducers, a simple model is used to estimate the transient diffraction encountered in co-axial flat hydrophone measurements.
authors.affiliation: Dept. of Radiol., Detroit Receiving Hosp., Detroit, MI.
authors.forename: A
authors.initials: A
authors.lastname: Goldstein
authors.forename: D R
authors.initials: DR
authors.lastname: Gandhi
authors.forename: W R
authors.initials: WR
authors.lastname: O'Brien