Piezoelectret-based hydrophone: an alternative device for vibro-acoustography - Medeiros, Leandro José de; Kamimura, Hermes Arytto Salles; Altafim, Ruy Alberto Pisani; Carneiro, Antonio Adilton Oliveira; Amorim, Mardson Freitas de; Altafim, Ruy Alberto Corrêa (Measurement Science and Technology, 2015)