G - Physics – 01 – F
Patent
G - Physics
01
F
G01F 23/284 (2006.01) G01S 7/28 (2006.01)
Patent
CA 2362636
A method and apparatus for processing a time domain reflectometry (TDR) signal having a plurality of reflection pulses to generate a valid output result corresponding to a process variable for a material in a vessel. The method includes the steps of determining an initial reference signal along a probe, storing the initial reference signal as an active reference signal, periodically detecting a TDR signal along the probe in the vessel, and computing the output result using the TDR signal and the active reference signal. The method also includes the steps for automatically or manually updating the active reference signal. The method of updating the active reference signal includes the steps of detecting a sample TDR signal for the probe in the vessel; establishing at least one transition point on the sample TDR signal and the active reference signal; combining a portion of the sample TDR signal on one side of the at least one transition point with a portion of the active reference signal on the other side of the at least one transition point to establish an updated reference signal; means for overwriting the active reference signal with the updated reference signal for use in subsequent computations of the output result.
Cummings Donald D.
Mccarthy William Patrick
Perdue Kenneth L.
Wartmann Gerd
Endress + Hauser Gmbh + Co.
Smart & Biggar
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