Damage monitoring in historical murals by speckle interferometry
Klaus D. Hinsch|Gerd Gülker|Holger Joost
In the conservation of historical murals it is important to identify loose plaster sections that threaten fall off. Electronic speckle interferometry in combination with acoustic excitation object has been employed monitor areas. To avoid disadvantages high sound irradiation complete building a novel directional audio-sound source based on nonlinear mixing ultrasound introduced. The optical system was revised for optimum performance new environment. Emphasis placed noise suppression increase sensitivity. Furthermore, amplitude and phase data response over frequency-range inspected are gain additional information state or paint. Laboratory studies sample specimen supplement field campaigns at sites.
Proceedings of SPIE