Monchenko, O.V.2017-02-282017-02-282014-09-24http://er.nau.edu.ua/handle/NAU/25036The new multi-layer materials widely be used in aircraft. In the article present the new method of multi-layer material thickness measurement, which is based on the digital Hilbert transformation and the signal unwrapped phase analysis and offered uncertainly estimation for two-layers materials.enThesis