FIELD: nondestructive testing, detection of hidden flaws of joints of type of separation, poor bonding and so on in single and multilayer cellular and other structures composed of plastics, metals or their combinations. SUBSTANCE: pulse of forces continuous oscillations are periodically excited in matching system "converter-object" and amplitude and phase difference between radiated and received signals are measured and used to evaluate presence of defects. EFFECT: method displays high sensitivity and low consumption of energy for excitation of impedance converter; development of sensitive and energy-saving portable flaw detectors. 1 dwg
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