The deterioration of sandstone cultural relics,such as surface weathering,soluble salt enrichment and microbial erosion,is common.Take Mount Longduo Rock Carvings as an example,the surface weathering are related to the water erosion and circulating soluble salt crystallization.Infrared thermal imaging helps to obtain surface water distribution images instantly,especially completing the detection of water seepage point and surface flow distribution of stone carvings in the heating process quickly and nondestructively.With the help of microwave moisture measurement technology,water distribution can be scanned at different levels,which supports the deep-level research of disease mechanism,so as to provide support and reference for the conservation of such cultural relics.Both infrared thermal imaging and microwave moisture measurement reflect certain water content information of sandstone relics.The combined analysis of microwave moisture measurement and infrared thermal imaging can effectively detect the distribution of water,the location of water seepage,the source of water seepage and the law of water activity on the surface and depth of sandstone cultural relics.Infrared thermal imaging can also detect the temperature distribution on the surface of stone relics,and it should be noted that it's necessary to conduct the detection in proper weather to ensure the detection data is accurate.Microwave moisture measurement analysis can be used to study the distribution of water at different heights and depths.Infrared thermal imaging and microwave moisture measurement in situ analysis technology are used for the detection of water,hidden cracks,seepage points and other conditions of sandstone cultural relics.Compared with the traditional visual observation,their advantages of being efficient,accurate,non-destructive and non-contact are definite.Instant information feedback provides a basis for real-time decision-making.The application of infrared thermal imaging and microwave moisture measurement is worth promoting in the investigation of sandstone cultural relics.
Sandstone cultural relicsWeatheringInfrared thermal imagingMicrowave moisture measurementNondestructive in-situ testing
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