Photo-acoustic detection is carried out on the laser-induced damage of fused silica glass. The Nd: YAG laser with the wavelength of 1064 nm, pulse duration of 10 ns and the maximum output energy of 7.0 J is used in the experimental. Results showed that: photo-acoustic could not be detected when damage has not occurred. Photo-acoustic signals containing high frequency components can be received after damage occurs. Compared with the sensor attached to the end surface and placed in the air, attaching the sensor to the side has the characteristics of high signal-to-noise ratio and does not affect the optical path. Above work provide a new technical idea for the photo-acoustic method in the damage detection.
The ability to remove the black crust from stone substrates has great research significance in Cultural Heritage. Laser cleaning has achieved good cleaning results in stone heritage in recent years. However, the extremely high light absorption and low melting point of biotite in the mineral composition of granite can easily cause damage during the cleaning process. In this study, the thermal stress generated by the laser action in the black crust was used to peel off the black crust. And a model of three-dimensional thermal stress was established under the movement of the laser heat source based on the experimental phenomenon of warping to peel off the black crust. The model agrees with the experimental results that the black crust is peeled off by tensile and shear stresses.
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