title: A high amplitude, time reversal acoustic non-contact excitation (trance).
abstract: This paper describes the principle behind a high amplitude non-contact acoustic source based on the principle of time reversal (TR), a process to focus energy at a point in space. By doing the TR in an air filled, hollow cavity and using a laser vibrometer in the calibration of the system, a non-contact source may be created. This source is proven to be more energetic than an off the shelf focused ultrasound transducer. A scaled up version of the proposed source has the potential to allow nondestructive evaluation processes that require high amplitude, such as nonlinear elastic wave spectroscopy (NEWS) techniques.
authors.affiliation: Geophysics Group EES-17, MS D446, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. pylb@lanl.gov
authors.forename: Pierre-Yves
authors.initials: PY
authors.lastname: Le Bas
authors.forename: T J
authors.initials: TJ
authors.lastname: Ulrich
authors.forename: Brian E
authors.initials: BE
authors.lastname: Anderson
authors.forename: J James
authors.initials: JJ
authors.lastname: Esplin