Tubular acoustic pressure wave generator

摘要

A pressure wave generator comprises an acoustic tube 1, and a driving device 3 connected to one end of the tube for generating acoustic waves toward the interior of the tube 1. A plurality of Helmholtz resonators 2 each having a channel through which the cavity is connected with the interior of the acoustic tube 1 are arranged on the tubular wall of the acoustic tube 1 with suitable axial spacing. Each of the Helmholtz resonators 2 comprises a throat 21 having a narrower in diameter than the acoustic tube 1 and joined at a base end thereof to the tubular wall of the acoustic tube 1, and a cavity 22 joined at the one end of the throat 21 and having a suitable volume. The generator suppresses the generation of shock waves, and generates shock-free larger pressure amplitude than the ones conventionally achieved.