The potential use of plume imaging for real-time monitoring of laser ablation cleaning of stonework |
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Authors: | A Khedr V Papadakis P Pouli D Anglos M A Harith |
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Institution: | (1) Decontamination and Decommissioning Technology Development Division, Korea Atomic Energy Research Institute, 1054 Daedeokdaero, Yuseong Gu, DaeJeon, 305-353, Korea;(2) Korea Atomic Energy Research Institute, Chung-Nam National University, 1054 Daedeokdaero, Yuseong Gu, DaeJeon, 305-353, Korea;(3) Environmental Engineering Department, Chung-Nam National University, 220 Gung-dong, Yuseong Gu, DaeJeon, 305-764, Korea |
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Abstract: | In this work, the potential of plume imaging was investigated as a real-time monitoring technique for the control of the laser
cleaning process in cultural heritage objects with emphasis on encrusted stonework. Optical pulses generated by Nd:YAG laser
were used to remove a high absorbing layer of crust from the surface of a lower absorbing marble substrate. Two regimes of
operation have been employed for laser cleaning test, Q-switched ns mode, and short free running μs mode. Laser induced breakdown
spectroscopy (LIBS) was also employed to study the stratigraphy of the cleaned surfaces, and thus to confirm the validity
of the suggested monitoring technique. The tests proved the prospective of introducing plume imaging techniques as a straightforward
and inexpensive tool for the real-time monitoring of laser ablation and the determination of the critical point for a safe
surface cleaning intervention. |
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