The self-noise response of a large-planar PVDF hydrophone to turbulent boundary layer pressure fluctuation

In this paper, the self-noise response of a large-planar PVDF hydrophone to turbulent boundary layer pressure fluctuation (TBLPF) is investigated. The general expression is deduced, in which TBLPF wave-number frequency spectrum and the response function of hydrophone are used to calculate the auto-spectrum of output voltage of hydrophone excited with TBLPF. The response function of hydrophone is calculated by transfer matrix method. The sensitivity of hydrophone and the power spectrum density for equivalent plane wave pressure of its response to TBLPF are also calculated. It is shown that both the sensitivity of hydrophone and its response to TBLPF have some peaks. These peaks are due to fie-cural vibration of hydrophone and they are difficult to be reduced by increasing the thickness of the coating. Some methods to avoid or reduce these peaks are discussed.