Hyperspectral Imaging as a Non Destructive Technique to Control the Laser Cleaning of Graffiti on Granite
Source abstract
Abstract
The progress of the laser cleaning of two graffiti paints on coarse-grained granite was in situ followed up by the hyperspectral imaging technique, through the calculation of a quantitative index based on a linear spectral mixture analysis model, which provided an estimation of the cleaning level attained along the process. The laser used was a nanosecond pulsed Nd:YVO $$4$$ source, at 355 nm wavelength and, in order to validate the results of laser cleaning, conventional analytical techniques as optical microscopy, scanning electron microscopy with energy dispersive X-ray spectrometry, Fourier transform infrared spectroscopy and spectrophotometer colour measurements were also implemented. The results indicated that hyperspectral imaging technique is a reliable tool to in situ control the process of laser cleaning of graffiti in coarse-grained granites in order to determine the laser scans enough to achieve the best possible cleaning without modifying the granitic substrate.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Laser Material Processing Techniques · Laser-induced spectroscopy and plasma · Surface Roughness and Optical Measurements
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References (27)
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