Phononic Crystal Waveguide Transducers for Nonlinear Elastic Wave Sensing.

ABSTRACT: Second harmonic generation is one of the most sensitive and reliable nonlinear elastic signatures for micro-damage assessment. However, its detection requires powerful amplification systems generating fictitious harmonics that are difficult to discern from pure nonlinear elastic effects. Current state-of-the-art nonlinear ultrasonic methods still involve impractical solutions such as cumbersome signal calibration processes and substantial modifications of the test component in order to create material-based tunable harmonic filters. Here we propose and demonstrate a valid and sensible alternative strategy involving the development of an ultrasonic phononic crystal waveguide transducer that exhibits both single and multiple frequency stop-bands filtering out fictitious second harmonic frequ

SUBMITTER: Ciampa F 

PROVIDER: S-EPMC5676704 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature