Nondestructive Testing Of Deterioration For Yungang Grottoes Based On Thz-Tds

A new non-destructive test method based on terahertz time domain spectroscopy technology (THz-TDS) was used to analyze the hollowing deterioration of Yungang Grottoes in this paper. The hollowing samples are strictly prepared and a series of experiments were designed in order to ensure the representativeness of the experimental results. The results show that this method can obtain the hollowing deterioration states to a certain extent with high reliability. At the same time, it can freely adjust the severity of the judgment standards. In particular, the same delay time interval was about 5 ps for the same thickness difference for hollowing deterioration, which effectively and accurately characterized the thickness hollowing deterioration for 1 mm, 2 mm and 3 mm. We can also established the hollowing thickness model by using the thickness correlation coefficient k. Detecting the hollowing deterioration surface diseases with nondestructive testing method based on THz-TDS, which has very important practical significance for the repairing and strengthening of Yungang Grottoes.