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Behaviour of Electromagnetic Waves in Different Media and Structures Part 6

Tham khảo tài liệu 'behaviour of electromagnetic waves in different media and structures part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 138 Behaviour of Electromagnetic Waves in Different Media and Structures It is shown in the interpretation results Fig. 27 Fig. 28 Fig. 29 that the delamination in wall paintings in the detection region is mainly located at the lower left corner which is in consistence of the area where the loss of mural plasters is serious. In addition delamination is also serious in the lower right corner and the upper part of detection area. Taking into account that the vertical resolution of RAMAC ground penetrating radar is about 5 mm delamination in detection area should be more serious Fig. 30 . Fig. 28. Presentation of GPR profile H5 Fig. 29. Presentation of GPR profile V1 Detection of Delamination in Wall Paintings by Ground Penetrating Radar 139 Fig. 30. Comprehensive interpretation of delamination in wall paintings marked by arc 4. Conclusion Focusing on the propagation of high frequency pulse electromagnetic waves in layered lossy and dispersive medium and after the physical forward modeling experiment this chapter has successfully located delamination in polished wall paintings by wall coupling antennas using RAMAC ground penetrating radar. It is shown that the ultra-wide band ground penetrating radar is capable of detecting delamination in vertical resolution of about 5 mm when it is equipped with a transmitting antenna of 1.6 GHz central frequency. 5. Acknowledgment This project is jointly sponsored by State Administration of Cultural Heritage People s Republic of China in Cultural Heritage Conservation Science and Technology Foundation No.200101 . The author wishes to thank Dr. Tao YANG of Lanzhou University and Xuebing BAI of Beijing Xing Heng Yun Science Trade Co. Ltd. China for their collaboration and support with the case work. The author is also indebted to Professor Yi SU of National University of Defense Technology China and Professor Zheng ou ZHOU of University of Electronic Science and Technology of China for their kind and helpful comments in the .