Peter R. Stepanishen
Dept. of Ocean Eng., Univ. of Rhode Island, Kingston, RI 02881
Stephen V. Letcher
Univ. of Rhode Island, Kingston, RI 02881
A combination of a schlieren system and a polarimetric fiber-optic detection system is used to obtain line integrals of transient acoustic fields a distance z in front of a planar source. The x,y dependence is obtained from a tomographic reconstruction algorithm. The signal is then forward projected away from the source or back-projected toward the source using wave vector/time domain and frequency methods. Numerical results will be presented to illustrate the projection methods for a number of different transient signals from planar sources with separable and nonseparable space/time velocity distributions. Experimental results for selected source distributions from pulsed ultrasonic transducers will then be presented and discussed.