METHOD FOR ULTRASONIC INSPECTION OF ARTICLES MADE OF POLYMER COMPOSITE MATERIALS Russian patent published in 2017 - IPC G01N29/04 

FIELD: electronics.

SUBSTANCE: use: to assess quality of structures of a closed loop with an internal cavity made of polymer composite materials, for example, coal-plastic or fiber-glass coal-plastic. Essence of the invention consists in the fact that excitation and reception of ultrasonic vibrations pulses are performed by roller transducers, arranged on one side of controlled article, wherein the tilt angles of roller blocks and the rollers axes positions are equal. In the method at first the amplitude value of the bottom signal of the S_o adjusting sample in a specific point and the average amplitude value of the bottom signal of the S_os adjusting sample in adjacent points are determined. By constructed influence curve of the amplitude values of the S_o bottom signal on the distance passed by transducers, minimum value of the bottom signal amplitude being S_A rejected criterion is determined. By constructed influence curve of the difference between values of S_o and S_os from the distance passed by transducers, minimum value of difference between values of S_o and S_os, being S_R rejected criterion is determined. Further, the amplitude value of the bottom signal of the S_i article in a specific point and the average amplitude value of the bottom signal of the S_is article in adjacent points are determined, obtained values are analyzed by comparing them with S_A and S_R rejection criteria, and if S_i<S_A and/or S_i-S_is<S_R, stating the defect.

EFFECT: technical result is provision of high sensitivity and reliability of defects detection in articles made of polymer composite materials.

1 cl, 5 dwg