| 摘要 |
<p>An acoustic damper for substantially reducing the reverberation echoes at the junction (at 36) between an acoustic signal propagating fluid and a material having an acoustic impedance substantially different from that of the fluid is disclosed. The damper, which is particularly adapted for use in ultrasonic transducers, comprises a layer (38) of a material having an acoustic impedance which substantially matches the acoustic impedance of the fluid (19), such material preferably being a foam plastic material having sufficient hardness to be acoustically stable.</p> |
