Abstract
The wave structure is the theoretical displacement and energy distribution of a specific guided wave mode on cross-sections of a medium. It would be of significant meaning in selecting guided wave modes and exciting a single mode guided wave if the wave structures can be measured directly, but hard to accomplish in opaque media due to its physical constraints. This paper proposes a method to measure the wave structure of non-dispersive guided waves by changing the excitation position and frequency. This method avoids directly measuring the displacement of the cross-section and only needs to receive signals at one position on the surface. The feasibility of such a method is proved by applying the reciprocity theorem. Then, a detailed scheme for measuring wave structure of non-dispersive guided waves is given. According to this scheme, the wave structure of the Rayleigh wave in aluminum is measured. Experimental results show agreement with the theoretical expectations. The measurement method is verified. This work could be a guide to practical guided wave applications in the future.
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