Most modern technological processes measure the rate and flow of gas. For this purpose, ultrasound, especially pulsed time, has begun to be applied widely. The disadvantage of most pulsed temporal methods for measuring is that signal amplitude can vary only in strictly defined limits. Otherwise, the signals may be sent or received at the wrong moment. My 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. 

Article in Lithuanian