Ключевые слова: angle, assurance, block, calibration, control, defect, defects, destructive, detect, dimension, echo, education, equipment, factory, flaw, gate, gauge, imperfection, industrial, industry, inspection, inspector, inspectors, internal, machinery, material, measurement, metal, ndt, non, outside, peak, plate, probe, pulse, quality, signal, sound, steel, structure, surface, technology, test, testing, ultrasonic, ultrasound, uncertainty, ut, velocity, verification,