LASER VIBRATION DEFEKTOSOKOPY OF MULTILAYER SHELLS USING FEEDBACK EFFECTS IN SEMICONDUCTOR LASERS

Composite materials with a unique set of physical and mechanical properties, are wide used in aerospace branch. Since conventional methods for detecting defects are not always sufficiently productive and sensitive, the actual task is to develop methods and control products from composite materials. It is advisable to use the methods of vibroacoustic diagnostics, which allows not only to detect defects, but also to recognize them. To eliminate the drift performance of the measuring system and increasing its sensitivity is expedient to combine the functions of the radiation source and the receiver in a single element using laser avtodyne systems based on semiconductor laser.. The use of higher spectral harmonics autodyne signal allows to determine the distance to the object and the amplitude of movements and vibrations.