The paper describes a general approach for processing data from a guided wave transducer array on a plate-like structure. The problem of finding optimal array element layout, which allows the number of elements and amount of measured data to be minimized without compromising array performance, is considered. It is shown that in the case of the far field imaging the image can be reconstructed using much fewer array elements than the classical Nyquist–Shannon sampling theorem requires. A new sampling criterion is derived and an optimised sparse array layout is proposed. The theory is validated experimentally using a guided wave array containing electromagnetic acoustic transducer elements for exciting and detecting the S 0 Lamb wave mode in a 3-mm-thick aluminum plate.
|Title of host publication||42nd annual review of progress in quantitative nondestructive evaluation|
|Subtitle of host publication||Incorporating the 6th European-American workshop on reliability of NDE|
|Publisher||American Institute of Physics (AIP)|
|Number of pages||9|
|Publication status||Published - 10 Feb 2016|
|Name||AIP Conference Proceedings|
|Publisher||American Institute of Physics|