Abstract
Remote laser-induced fluorescence of stone materials was performed with application towards cultural heritage. Fluorescence was induced in targets ∼60 m from a mobile lidar laboratory by ultraviolet laser light, either from a frequency-tripled Nd:YAG laser or from an optical parametric oscillator system. Analysis was performed on combined spectra from the different excitation wavelengths and it was noted that important additional information can be gained when using several excitation wavelengths.
Highlights
Laser-induced fluorescence (LIF) can be used to distinguish different areas on surfaces in numerous applications, for example, tissue diagnostics [1]
Remote laser-induced fluorescence, known as fluorescence lidar [3], has earlier been applied by our group to aquatic monitoring [4], studies of vegetation status [5] and surfaces of historical buildings [6, 7]. In these measurements, performed with single wavelength excitation, we have illustrated that chlorophyll-rich areas, regions previously exposed to chemical treatment, as well as different stone types can be demarcated
The measurements presented in this paper are from a campaign with brick samples measured in Lund, Sweden, a field campaign at Ovedskloster castle in southern Sweden and a field campaign at Coliseum in Rome, Italy
Summary
Laser-induced fluorescence (LIF) can be used to distinguish different areas on surfaces in numerous applications, for example, tissue diagnostics [1]. By studying details in the fluorescence spectra from different parts of a building, it may, for example, be possible to assess surface damage and detect traces of chemicals previously used for restoration purposes, which are often unnoticed in visual inspections These signals can aid in understanding the effects of earlier restoration techniques and could form a basis for future maintenance and intervention. Remote laser-induced fluorescence, known as fluorescence lidar [3], has earlier been applied by our group to aquatic monitoring [4], studies of vegetation status [5] and surfaces of historical buildings [6, 7] In these measurements, performed with single wavelength excitation, we have illustrated that chlorophyll-rich areas, regions previously exposed to chemical treatment, as well as different stone types can be demarcated. We discuss different analysis methods for extracting useful information from huge fluorescence data sets
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