Underwater sound transmitter-receiver

Abstract

Abstract PURPOSE:To convert acoustic energy into electric energy effectively by covering a piezoelectric sheet, which has positive and negative electrodes opposing in a thickness direction, with an acoustically-transmissive insulating material without containing bubbles and an air layer. CONSTITUTION:On both the sides of piezoelectric sheet 1 in its thickness direction, electrodes 2 and 3 are provided and then connected to terminals 2' and 3' via lead wires respectively. This sheet is covered with synthetic resin 7, whose acoustic impedance density is close to that of water, without leaving bubbles and an air layer. Here, when the thickness of the piezoelectric sheet is denoted by (t), pressure in the sheet is Pt and an output voltage in proportion to Pt is developed between electrodes 2 and 3 and terminals 2' and 3'.

Inventors

• 👤 Haimi Takasaki

Bibliographic Details