An Arc PVDF Hydrophone with Adjustable Beam Width

Generally, the beam width of planar hydrophone is limited by its wavelength size, that is, when the receiving aperture is fixed, the beam width at a certain frequency is also fixed. When the working frequency is increased, in order to meet the beam width index, the receiving area of the hydrophone must be reduced accordingly, which reduces the capacitance value of the hydrophone and the ability of anti-interference and anti-current noise of the hydrophone. Large area receiving is one of the biggest advantages of PVDF hydrophone, so how to improve the beam width without reducing the receiving area is an important problem to be solved. Therefore, a circular arc backed PVDF hydrophone is proposed in this paper, which can improve the directivity of the hydrophone and make the beam width no longer limited by its wavelength size. The beam width can be adjusted by changing the shape and radian of the arc backing, so that it can be applied to different frequencies.