Author(s)

Peter Meinlschmidt & Lutz Mehlhorn

Abstract

Two nondestructive testing measurement techniques, namely video holography and thermography are used for the inspection of modern and historical replacement materials (mortars and pigments). Test objects of sandstone or tuff, such as would have been used in a medieval church of Northern Germany, including replicas of historical frescoes, are specially prepared for these measurements. Aim of this test is to observe the reaction of frescoes to temperature changes produced by short heat impacts. Furthermore the quality of the bonding between historical and modern replacement materials and the surrounding historical substance should be measured. Using transient thermography it is possible to separate modern and historical materials as well a

Keywords