The training laboratory bench consists of an experimental unit and a control unit. The bench is designed for the experimental determination of sound speed using the method of standing waves.
The experimental unit is a transparent plexiglas tube of 1m long, On one side of the tube a speaker is installed, on the opposite side – the plug that performs the role of a sound waves reflector. Along the entire length of the tube microphones are installed at regular intervals. Together with the speaker they are output to a socket and connected by means of a multicore cable to the control unit.
The structure of the control unit includes a power source, a power amplifier and a 28-channel meter. The control unit is connected to a PC (not included in delivery set) via USB-port. Sound control and display of measurement results are accomplished on the PC.
When the sound source is switched on, the waves passing through the tube are reflected from the plug and create counter fluctuations, which form a standing wave. The graphs of sound vibrations are displayed on the PC screen in real time mode. Along with the graphical representation of a real acoustic process, the program performs a theoretical plot of the standing wave, which is built with the help of mathematical modeling methods. When changing the radiation frequency between 0 and 500 Hz, the program registers various periods of the standing wave. The laboratory facility is equipped with a computer-animated model of the experiment, which is designed to render the wave effects that occur at different frequencies, and can be used to prepare for the laboratory work in the study of acoustic phenomena. Animation is synchronized with the experiment, which facilitates the perception of the physical processes and enhances the visibility of the processes.