Roman Kozłowski

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The application of triangulation laser displacement sensors to the continuous in-situ monitoring of the response of wooden cultural objects to variations in temperature and relative humidity in their environment is reported. The sensors are robust, fast, and precise, provide non-contact measurements, and are capable of operating in the field. They have been(More)
Numerical modelling was used to follow the evolution of the moisture content gradient and the stress field resulting from the restrained differential dimensional response across a wooden cylinder, simulating sculptures, in response to variations in temperature (T) and relative humidity (RH). Material properties of lime wood (Tilia sp.) were used in the(More)
In the church of Santa Maria Maddalena in Rocca Pietore, Italy, the dimensional response of the wooden altarpiece to variations in indoor temperature and relative humidity (RH) was monitored between December 2002 and March 2005. Measurements demonstrated that only the external layer of wood, several millimetres thick, continually absorbs and releases water(More)
The Guggenheim-Anderson-de Boer (GAB) three-parameter sorption equation has been used to interpret the adsorption and desorption isotherms of water vapour measured for 21 important cultural heritage wood species used in the past for panel paintings and woodcarving. The equation is capable of describing the full shape of the isotherms and yields meaningful(More)
Acoustic emission (AE) monitoring was used to trace directly the fracture intensity in cylinders of lime wood subjected to variations in temperature and relative humidity (RH) in their environment. High-frequency components produced by mechanical fracturing were extracted from the raw AE signals using the wavelet transforms. The accumulated energy of these(More)
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