Apparatus for measuring acoustic property to bubble-wake of a ship using a variable transmit signal

摘要

acoustic characteristic measurement apparatus for the bubble trajectory of the vessel using a variable transmission signal according to the present invention, sound transmission generates a transmission signal, and the noise from the initial trajectory measuring unit environment with no air bubbles so as to be fixed in frequency of the acoustic transmission signal for measuring the bubble trajectory through the acoustic reception signal sent back by the bubbles generated in accordance with the operation of the vessel is the minimum length of the primary signal effect "to search for a selected length of the acoustic transmission signal, the fundamental frequency, the optimum trajectory characteristic bubble that appears under basic signal length f ' _{c to retrieve} may include a measurement control section for selecting the frequency of the acoustic transmission signal. ; According to the present invention , but using a sound signal, adapting the length and frequency of the acoustic signal in the surrounding environment enemy Acoustic measurements are available for the bubble wake trusted by changing to.