Multichannel Wideband Mode-Selective Excitation of Ultrasonic Guided Waves in Long Cortical Bone

Ultrasonic guided waves have been proposed as a promising means to evaluate the long cortical bone. However, the complete extraction of all dispersion curves is still challenging. Aiming to enhance the signal-to-noise-ratio (SNR) and improving the ambiguity of mode identification, we propose a multichannel wideband mode selective excitation method. The method was tested on an aluminum plate and a bone-mimicking plate. The results illustrated that the proposed method allows the selective excitation of the desired modes and enhances the mode amplitudes, which could be helpful to the multimodal guided waves based assessment of long cortical bone.