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Test with a micro-fothometer at weathering stone sculpture of Yungang Caves

Huang Kezhong;Zhong Shihang;Institute of Conseruation;China Academy of Railway Sciences;  
The paper introduce the successful application of the Micro-fothometer,a transtformed electrical news survey instrument used in geophysical exploration,to the conservation of weathering stone sculptures in Yungang Caves.It has solved the problem of nondestructive examination of the weathering depth of stone sculptures and the permeated depth of spray coating.The paper explains the principle,the method and the analysis of the test with a micro-fothometer,which has opened a new way for the study of the conservation work on weathering stone relics both in China and abroad.
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