APPARATUS FOR MEASURING SOUND ABSORBING RATE OF SOUND ABSORBING MATERIAL USED UNDERWATER AND HAVING SENSOR CORRECTING FUNCTION

摘要

PURPOSE: An apparatus for measuring a sound absorbing rate of a sound absorbing material is provided to effectively measure the sound absorbing rate of a sound absorbing material used underwater by forming an underwater environment in an impedance tube. CONSTITUTION: A sound absorbing rate measuring apparatus includes an impedance tube(10). A sound wave generator(11) is installed at one side of the impedance tube(10). A plurality of sensor attaching holes is formed in the impedance tube(10). A sensor compensating device is selectively coupled to an opening section of the impedance tube(10) so as to correct a frequency response function of a hydrophone(30). A test sample fixing device is selectively coupled to the opening section of the impedance tube(10) so as to obtain various measuring results by adjusting a distance between a sound absorbing material and the hydrophone(30). A CPU is provided to calculate a sounding absorbing rate of the sound absorbing material(1).