In this work, the stepped heating thermography was used to detect the ancient tomb murals in the early Yuan Dynasty. During the experiment, the heating and cooling processes were collected at the same time. The collected data will be post-processed using methods such as: Thermal Signal Reconstruction, Pulsed Phase Thermography, Principal Component Thermography, Thermal Tomography Method. By comparing the thermal images and results of different processing methods, it is found that different methods have different effects when facing different types of defects in the murals.
The Thermal Tomography Method can reflect the depth information of the defects to a certain extent. Each method has its own advantages and disadvantages. In view of the complicated murals, various methods can be combined to more accurately and clearly identify the type of disease and the location and other information, while providing effective scientific means for the protection of cultural relics.
The manufacture and use of bronze ritual vessels, as far back as the second and the first millennium BC, is an essential tool in maintaining social order and political structure in China’s Shang and Zhou periods, yet the casting techniques that made them have not been well discussed. The core issue is the manufacturing and use of clay moulds. Not only their design and positioning, archaeological studies show that their material property is also a key to the success of casting such products. The present work, among a series research, is mainly focused on the thermal property analysis of the ancient bronze casting moulds and two other contemporary moulds for comparison. Thermal diffusivity is measured with pulsed thermography as a non-destructive method. The results prove that the thermal diffusivity of ancient bronze casting moulds are relatively low which allows liquid bronze to flow for an extended duration, filling all fine patterns and corners. The difference between the three types of moulds are discussed.
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