Underwater characterizations of monolithic piezoceramic and 1–3 composite using a self-designed transducerMuhammad Saleem Mirza, Tariq Yasin, Masroor Ikram, Muhammad Altaf, Zahir Mushtaq and Muhammad Nasir KhanEur. Phys. J. Appl. Phys., 73 3 (2016) 30101DOI: https://doi.org/10.1051/epjap/2016150243