title: Probing the interior of a solid volume with time reversal and nonlinear elastic wave spectroscopy.
abstract: A nonlinear scatterer is simulated in the body of a sample and demonstrates a technique to locate and define the elastic nature of the scatterer. Using the principle of time reversal, elastic wave energy is focused at the interface between blocks of optical grade glass and aluminum. Focusing of energy at the interface creates nonlinear wave scattering that can be detected on the sample perimeter with time-reversal mirror elements. The nonlinearly generated scattered signal is bandpass filtered about the nonlinearly generated components, time reversed and broadcast from the same mirror elements, and the signal is focused at the scattering location on the interface.
authors.affiliation: Geophysics Group EES-17, MS D443, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. pylb@lanl.gov
authors.forename: P Y
authors.initials: PY
authors.lastname: Le Bas
authors.forename: T J
authors.initials: TJ
authors.lastname: Ulrich
authors.forename: B E
authors.initials: BE
authors.lastname: Anderson
authors.forename: R A
authors.initials: RA
authors.lastname: Guyer
authors.forename: P A
authors.initials: PA
authors.lastname: Johnson
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D000535:Aluminum; D003198:Computer Simulation; D004548:Elasticity; D004867:Equipment Design; D005898:Glass; D007834:Lasers; D009038:Motion; D017711:Nonlinear Dynamics; D012542:Scattering, Radiation; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography; D013997:Time Factors; D014159:Transducers; D014732:Vibration
chemical_list: D000535:Aluminum