[en] A model of an ultrasonic waveguide with a cos junction and optimization of the bolt attachment point and the length of the reflector was proposed. A numerical simulation of the proposed waveguide design was carried out in the Comsol Multiphysics program. According to the results of numerical simulation, the resonant frequency of the waveguide with the cos junction was found, the optimal length of the reflector and the point of attachment of the bolt ensuring its minimum deformation. Also the design of this waveguide was simulated in a developed program that provides parallel computations using OpenCL technology. (paper)

[en] It is proposed generator of power ultrasonic signal with digital feedback and digital control of generating signal. Such approach will allow for the implementation of a rather complex control algorithm that is not feasible by circuit engineering means. A functional diagram of the layout of the control unit and generating a powerful ultrasonic signal has been developed. The digital microcontroller generates periodic pulses that trigger the generator at an appropriate frequency and controls the voltage at the output of the regulated power supply. The voltage level of the power source is set according to required power of the generated signal. The algorithm and software for the control of the signal generator with digital feedback has been developed. (paper)

[en] The work is devoted to the problem of obtaining images using radio and ultrasonic waves. These waves are not originally carriers of images, unless they carry a phase. In the simplest examples, it is theoretically and experimentally shown that waves with phase can be used to restore images of objects. (paper)