TY - JOUR AU - D Xiang AU - Gerald Blessing AU - Nelson Hsu C2 - Ultrasonics DA - 1996-01-01 00:01:00 LA - en M1 - 34 PB - Ultrasonics PY - 1996 TI - The design, construction and application of a large aperture lens-less line-focus PVDF transducer ER -