Multidimensional Data Analysis of Scanning Laser Doppler Vibrometer Measurements: An Application to the Diagnostics of Frescos at the US Capitol

Abstract

A large-scale survey (~700 m2) of frescoes and wall paintings was undertaken in the US Capitol Building in Washington DC to identify regions that may need structural repair due to detachment, delamination, or other defects. A common approach for postprocessing time series called proper orthogonal decomposition, or POD, was adapted to frequency-domain data in order to extract the essential features of the structure. The authors present a POD analysis for one of these panels, pinpointing regions that have experienced severe substructural degradation.