Measures shear wave velocity (Vs) of soil at very small strains to calculate initial shear modulus (Gmax). Non-destructive measurements can be made repeatedly during saturation, consolidation, or staged loading.
Uses piezo-ceramic bender elements mounted in the triaxial pedestal and top cap (or in oedometer caps) to transmit and receive S-waves across the specimen; optional P-wave transducers support Vp measurements.
Supports multiple interpretation methods time-domain first arrival, cross-correlation, and frequency-domain phase slope with automated and manual picking to validate arrivals and reduce user bias.
Integrated software coordinates excitation waveforms, high-speed acquisition, travel-distance handling from specimen geometry, and produces Vs, Gmax, and damping estimates vs. effective stress with exportable plots/tables.
Compatible with common specimen sizes and drainage configurations; operates under drained/undrained states with confining and back pressure, enabling stress–stiffness relationships and modulus degradation baselines.
