Monchenko O. Phase method ultrasound thikness of multilayer materials products

The thesis is devoted to issues of control of the thickness of layers of multilayer objects and environments, such as composite materials, etc. bimetals. In the thesis a new way to control the thickness of layers of multilayer media based on the echo-pulse ultrasonic method thickness measurement, which is based on the analysis phase characteristic of the signals. As an informative parameter determines the time position of the time jump of phase characteristic, which is due to the imposition probing and reflected signals. If analytical expressions determining the thickness of layers of multilayer objects of control and accuracy of measurement indicators in the proposed method, taking into account the acoustic properties of environments. Investigated the sensitivity of the method, as the dependence of the ratio of amplitudes and phases of incoming signals based on a claim to the measurement channels thickness devices phase charactiristic to implement this method. Shown that the high measurement accuracy is achieved with a broad band pass piezoelectric transducer. A software package for computerized ultrasound thickness devices, which can significantly expand their functionality.