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18 April 2022 Nonreciprocal guided wave steering via a space-time elastic phased array
Mohammadreza Moghaddaszadeh, Revant Adlakha, Mohammadali A. Attarzadeh, Amjad J. Aref, Mostafa A. Nouh
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Proceedings Volume PC12048, Health Monitoring of Structural and Biological Systems XVI; PC120480H (2022) https://doi.org/10.1117/12.2612865
Event: SPIE Smart Structures + Nondestructive Evaluation, 2022, Long Beach, California, United States
Abstract
Phased arrays have been a cornerstone of non-destructive evaluation, structural health monitoring and medical imaging for years due to their unique beam steering and focusing capabilities. Despite the recent advances in parallel beamforming and nonlinear imaging, such arrays are bounded by reciprocal symmetry which significantly limits the scope of their operation and applicability. Unlike band gap structures where nonreciprocity is often associated with a unidirectional diode-like behavior, a breakage of reciprocity in phased arrays manifests itself in the form different and independently tunable wave transmission (TX) and reception (RX) patterns. In this work, we present a combined analytical and experimental realization of an elastic phased array which operates within multiple frequency channels and is capable of simultaneous steering of multiple beams. To achieve this, we devise a class of phase shifters which augment a dynamic phase modulation on top of the conventional static phase gradient along the array transducers. As a result, the emergent array exhibits non-identical TX and RX profiles. The system’s performance is fully demonstrated via scanner laser vibrometer measurements of the displacement field and confirms the array’s ability to guide incident waves within frequency channels which are commensurate with the modulation rate and along the intended directional channels.
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Mohammadreza Moghaddaszadeh, Revant Adlakha, Mohammadali A. Attarzadeh, Amjad J. Aref, and Mostafa A. Nouh "Nonreciprocal guided wave steering via a space-time elastic phased array", Proc. SPIE PC12048, Health Monitoring of Structural and Biological Systems XVI, PC120480H (18 April 2022); https://doi.org/10.1117/12.2612865
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KEYWORDS
Phased arrays
Waveguides
Imaging arrays
Phase shift keying
Modulation
Nondestructive evaluation
Phase modulation
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