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VOLUME 4, ISSUE 1...

JANUARY 2008...

Acoustics Today...

Time Reversal Ultrasonic Probes Sound System Design Animal Bioacoustics and more...

A publication of the Acoustical Society of America...

Time Marches Backwards...

Acoustics Today...

A Publication of the Acoustical Society of America...

Volume 4, Issue 1 January 2008...

Cover The cover shows a photograph of a rectangular aluminum plate used in a Time Reversal (TR) experiment with the resulting image (inserted above) obtained at the focal time (specifically, the spatial distribution of the magnitude of the out-of-plane velocity). Note the welldefined peak in the inserted image that corresponds to the original source location. Note also that other energy exists elsewhere at the focal time. This is due to the fact that the experimental TR focusing process is never perfect due to a variety of factors that lead to energy leakage to other locations. Articles 5 Time Reversal--Brian E. Anderson, Michael Griffa, Car ne Larmat, Timothy J. Ulrich, Paul A Johnson Time reversal is a method of focusing energy onto a specific location in space and time, with potential applications in nearly every field of acoustics. 17 Resonances and Time-of-Flight Ultrasonic Probes of Condensed Matter Go Digital--Albert Migliori Both resonance and time-of-flight techniques for elastic modulus measurement are now accessible to everyone. Both methods have deep similarities based on the most precisely measured quantities in all of science, frequency and time, but advances in digital signal acquisition and processing have transformed these techniques into something no longer recognizable by the pioneers. 23 Sound System Design--Marshall Long "But the computer said it would be OK." Departments 31 Standards Animal Bioacoustics Subcommittee Debuts--David K. Delaney and Susan B. Blaeser For the first time ever, one of ASA's ANSI-Accredited Standards Committee has formed a Subcommittee-- Animal Bioacoustics. 35 National News--Elaine Moran Acoustical news from around the country. 39 International News--Walter G. Mayer Acoustical news from around the world. 43 Books and Publications--Dick Stern New and recent publications, reports, and brochures on acoustics. 45 Instrumentation--Dick Stern New and recent acoustic instrumentation and news about acoustic instrument manufacturers. 46 The Business of Acoustics--Dick Stern 47 Passings--Dick Stern A farewell to colleagues--D.F. Muster, L.H. Sibul Business Directory 49 Business card advertisements 51 Classified Cl...

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Acoustics Today source orgs ees ees11 geophysics timerev 2010 anderson acousts today

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