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A system for a high precision multi target level measurement based on guided microwave pulses is presented. A wide-band technique based on time-domain reflectometry (TDR) in combination with a TEM-waveguide as the probe fulfils the requirements of mm-precision level measurements in tanks. The coaxial waveguide provides very low dispersion for wide-band signals. Inside the coaxial waveguide the different fluids with their specific dielectric constants influence the waveguide's characteristicdoi:10.5194/ars-1-27-2003 fatcat:jmwo7jbxwvezvk7exaexgpprnm