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Journal Articles Geomechanics and Geophysics for Geo-Energy and Geo-Resources Year : 2022

Pulsed-laser source characterization in laboratory seismic experiments

Abstract

The present study aimed to characterize the properties of a laser-generated seismic source for laboratory-scale geophysical experiments. This consisted of generating seismic waves in aluminum blocks and a carbonate core via pulsed-laser impacts and measuring the wave-field displacement via laser vibrometry. The experimental data were quantitatively compared to both theoretical predictions and 2D/3D numerical simulations using a finite element method. Two well-known and distinct physical mechanisms of seismic wave generation via pulsed-laser were identified and characterized accordingly: a thermoelastic regime for which the incident laser power was relatively weak, and an ablation regime at higher incident powers. The radiation patterns of the pulsed-laser seismic source in both regimes were experimentally measured and compared with that of a typical ultrasonic transducer. This study showed that this point-like, contact-free, reproducible, simple-to-use laser-generated seismic source was an attractive alternative to piezoelectric sources for laboratory seismic experiments, especially those concerning small scale, sub-meter measurements.
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Dates and versions

hal-03494134 , version 1 (18-12-2021)

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Chengyi D Shen, Daniel Brito, Julien Diaz, Federico Sanjuan, Clarisse Bordes, et al.. Pulsed-laser source characterization in laboratory seismic experiments. Geomechanics and Geophysics for Geo-Energy and Geo-Resources, 2022, 8 (1), ⟨10.1007/s40948-021-00315-9⟩. ⟨hal-03494134⟩
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