Bottom reflector for a radar-based level gauge

摘要

How to calculate the transmission of the microwave signal towards the surface of the liquid from the top of the tank, receiving the microwave signal reflected against the surface of the liquid, and the water level of the liquid, a tank stored from the propagation time of the transmitted and the microwave signal received in the bottom reflector (15) for a liquid level meter (11) based on the radar to measure the water level 71 of the liquid stored in the tank 12 by the bottom reflector (15) is as close to the bottom of the tank when being installed, when the water level of the liquid above the reflecting structure is lower than the first reflection coefficient and the water level is the reflective structure of the liquid of the microwave signal has a second reflection coefficient for said microwave signal, wherein the first reflection coefficient is the second low-reflection structure than a reflection coefficient (23-24; 25; 23, 26; 27; 29; 32; 33; 32, 35; 36; 37; 41, 42; 43, 44; 51-52; 55-56 ; 61,72), characterized in that the bottom reflector made. ; Level gauge, radar, a bottom reflector, the resonant structure, polarization turning structures, absorbent structure