Direct Identification of Elasticity from Attenuated Spectrum in Resonant Ultrasound Spectroscopy

Resonant ultrasound spectroscopy (RUS) is an experimental measurement method for obtaining stiffness coefficients from the free resonant frequencies of a sample. The resonant frequencies are commonly extracted from the swept spectrum in a RUS experiment, which is not a trivial task for the high damping materials with broad and overlapped resonant peaks. Though several specific signal processing methods could help find resonant peaks, manual operation is a requisite for identifying the true-positive peaks, laboriously and empirically. To overcome these challenges, we proposed to obtain the elasticity from attenuated spectrum directly without explicit peak extraction. The feasibility of the method was assessed using the spectrum of a cortical bone specimen. The stiffness coefficients calculated by the proposed method showed a good agreement with the reference value (errors less than 4%).