Monitoring detaching murals in the Convent of Müstair (Switzerland) by optical metrology
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- 作者：Klaus D. Hinsch ; Konrad Zehnder ; Holger Joost ; Gerd Gü ; lker
- 关键词：Mü ; stair convent ; Holy Cross Chapel ; Murals ; Frescoes ; Plaster detachments ; Detachment mapping ; Percussion test ; TV-holography ; ESPI ; Vibration detection
- 刊名：Journal of Cultural Heritage
- 出版年：2009
- 出版时间：January-March 2009
- 年：2009
- 卷：10
- 期：1
- 页码：94-105
- 全文大小：873 K
文摘
The critical condition of detaching historical murals in the Convent of Müstair (Switzerland) prompted a series of investigations and conservation actions over the last 40 years. After percussion tests in 1984/1992, an advanced technology of time-average TV-holography has been applied in 2000 and 2005. The primary aim was to substantiate if and to which extent detaching is in progress. This case study explores characteristics and limits of traditional percussion tests and time-average TV-holography. Extensive mappings by both techniques are carried out on two different structures of wall paintings. The comparison shows that the so-called percussion test – when combined with a close experienced observation – reveals a holistic picture of the general condition of a threatened painting. Time-average TV-holography, on the other hand, yields highly accurate relative information on the spatial distribution of detached areas. Therefore, it is apt to provide an exact answer to the question if detachment is in progress or not.