In order to measure the thickness of the rusted bronze layer quickly and accurately, an active infrared thermal imaging technique is developed. Pulse flash lamp was used to excite the surface of the specimen, and infrared thermal imager was used to record the temperature decay of the specimen surface before and after flash. This paper presents a pulse thermal imaging multi-layer analysis method (PTI-MLA) which consists of a pulsed thermal imaging (PTI) system to acquire experimental data and a multilayer analysis (MLA) data-processing algorithm to derive parameters of the corroded bronze. This paper studies a bronze pot fragment from the China’s Spring and Autumn period excavated in Sujialong site, Hubei province. The corrosion thickness map of the fragment is calculated and analyzed by PTI-MLA method. Comparing the measured values with the CT scanning results, the error is less than 10%. The final result indicates that the PTI-MLA method can be used to measure the thickness of rust layer on the surface of bronze ware and obtain high-precision thickness images.
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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