ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

3pSA3. Laser interferometry for structural acoustics.

Yves H. Berthelot

Jacek Jarzynski

Hyun-Gwon Kil

Lance Wills

Ming Yang

School of Mech. Eng., Georgia Inst. of Technol., Atlanta, GA 30332-0405

Laser interferometry offers the possibility of measuring in real time instantaneous surface velocities in the (mu)m/s range by noninvasive measurements. It can also be used to measure the three components of the surface vector velocity at several points simultaneously and, therefore, it is a promising way of measuring structural intensity and power flow in arbitrarily complex structures under laboratory conditions. Three different laser interferometric probes are currently being used at Georgia Tech for research in structural acoustics. The advantages and disadvantages of each system will be discussed within the context of structural intensity measurements. [Work supported by the Office of Naval Research, Code 332 SM.]