The electromagnetic pulses are propagated by means of a waveguide that focuses the Electrical power and yields a technique often times extra productive than Non-Speak to Radar. D — فاصله بین سطح سنج رادار و سطح ماده C — سرعت نور T — مدت زمان پالس در غیاب مواد، https://mokhatab.org/what-is-a-radar-level-gauge-and-how-does-it-work/