CHAPTER 1: Background
1.5 Thesis Outline
This thesis concentrates on research into pulse compression and metamaterials. Each has the potential for improving the quality of measurements in various materials. Chapter 2 reports the mathematical background of several kind of coded excitations, as well as algorithms to perform pulse compression technique and filtering. Moreover, numerical simulations results are shown with the aim to give a guideline on the optimal choice of a coded excitation for a specific purpose. Chapter 3 is focused on the historical and theoretical background to acoustic metamaterial and phononic crystals. Chapter 4 shows the finite element simulation results for several exotic acoustic metamaterial structures. Numerical results on the use of acoustic metamaterial for sub-wavelength acoustic imaging are also shown. Experimental results on the use of acoustic metamaterials for sub-wavelength imaging purpose are given in Chapter 5, together with a path toward the realization of a broad-band acoustic metamaterial device. Chapter 6 reports the use of coded signals and advanced signal processing techniques for the non-destructive testing of several highly attenuating materials. Furthermore, it also shows the realization of a portable device for real time pulse compression, as well as its application on the investigation of concrete structure. An advanced application of the combined use of coded signals and pulse compression for thermography is shown in Chapter 7. Finally, Chapter 8 gives overall conclusions and ideas for further work.
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