A glass sensor study to estimate the corrosive stresses at stained glass windows of Santa Maria Del Mar, Barcelona

At the Gothic stained glass windows of Santa Maria del Mar, two models of Protective glazings (one with an internal and one with an external ventilation) realized. With so-called glass sensors the efficiency of different types of protective glazings was compared to each other and in contrast to the unprotected part of the window. The results show clearly that the efficiency of the externally ventilation protective is very poor. The combined impacts of climatic stresses, pollution and microbiological as well as synergetic effects are reflected in the glass sensor measurement. The corrosion progress of the sensor is determined by infrared spectroscopy and checked by microscopy.