DEVICE FOR DETERMINATION AND CONTROL OF VELOCITIES OF SURFACE AND LONGITUDINAL ACOUSTIC WAVES IN MATERIALS UNDER QUASI-STATIC AND CYCLIC LOADS

摘要

The invention relates to the field of methods for nondestructive material testing and can be used to investigate and control physico-mechanical characteristics of materials and elements of structures, their internal structure and changes of geometric dimensions under different loads. The technical result of the proposed device consists of enhancing informativeness of the optical-acoustic method for investigation and control of mechanical and structural properties of materials and elements both in free state and under quasi-static or cyclic load due to registration of not only acoustic longitudinal waves in the material but also surface waves. The technical result is achieved by the fact that in the device containing pulse-modulated laser connected to an optic-acoustic transducer by means of optic fiber, and also piezoelectric receiver connected to an analog-to-digital converter connected to a computer, where the controlled object is located between the optic-acoustic transducer and piezoelectric receiver, the second piezoelectric receiver is included additionally, where the said piezoelectric receiver is made in the form of a flat ring combined axiosymmetrically with the optic-acoustic transducer and connected to an analog-to-digital converter.