Amplitude and Phase Measurements of Vibrations of Radiating Surfaces in Order to Determine the Emitted Sound Field
A good knowledge of the velocity distribution on a vibrating surface permits computing the near field from this surface correctly. A method is described which determines the amplitudes and phases of the displacement at each point on a source (here a loudspeaker diaphragm) with harmonic excitation. At first the vibrations of the shell are visualized and the amplitudes measured by means of time-averaged optical holography interferometry. Once the amplitude distribution of the displacement of the surface has been thus obtained, a capacitive transducer is used in such a way that the relative phases of the displacement from one point to another can be determined.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members, $5 for AES members and is free for E-Library subscribers.