Thermal effects on artwork surfaces cleaned with laser ablation method

摘要

The work begins a short presentation of laser ablation method, together with exemplary results of artwork cleaning. Next parts show the application of dynamic infrared thermography for study thermal phenomenon induced by pulse laser radiation of various fluency and time duration. These investigations focused only on the results of irradiation, as both too short time and complexity of the ablation phenomena had made unable all measurements of pure ablation properties. Thermal data about pre- and post-ablation state were delivered by infrared thermographic system in the form of sequences of thermograms. Information of interest occurred on small parts of these images only, and study of thermal movies or typical graphs showed to be inconvenient. The paper presents applied transformation of every sequence to single synthesized images: temporal-spatial thermograms of the isolate fields only. Numerous examples of these images, named as field dynamic thermograms, presented for various laser ablation experiments prove the great informing potential of modern thermography and fa particular - signal processing for research and cleaning procedures optimizing works. Mentioned method of extracting useful information for dynamic of thermal distributions visualization can be of interest for other applications.