Vibro-Acoustic Modulation method for detection and characterization of various structural material flaws has been actively researched the last two decades. Most studies focused on monitoring macro-cracks requiring well established baseline (no-damage) value modulation index. The is specific a particular structure, measuring setup, other factors can't be in many practical situations without long...

A new approach for image reconstruction in THz computed tomography (THz-CT) is presented. Based on a geometrical optics model containing the signal amplitude and phase, novel algorithm extracting an average phase from measured signals derived. Applying results phase-contrast sinogram, which further used reconstruction. For experimental validation, fast time-domain spectrometer (THz-TDS) transmi...