In the article dealt the speed-flow meters, they are classified according to the working of the principle, discussed the advantages, disadvantages, a comparative review. The examination of all possible flow measurement methods, they can be sort into five major groups.
The aim was to review the different approaches used to measure the voltage amplitude value of a signal and to describe the capabilities of a projected instrument system. The most modern technological processes take measurement of flowing gas flow rate and flow. For this purpose, ultrasound, especially pulsed time are widely stared to apply. The most pulsed temporal method for measuring disadvantage is that a signal amplitude can vary only in strictly defined limits. Othewise, the signals may not be given or taken in wrong moment.

Article in Lithuanian