Periodic probe mapping

Details Periodic probe mapping Periodic probe mapping

1998-12-23

2000-06-20

Gregory, Bernarr E.

Communications: directive radio wave systems and devices (e.g.,

Determining distance

Material level within container

342 22, 342118, 73290R, 73291, 324629, 324637, 324642, 340603, 340612, 340618, 340620, G01S 1308

Patent

active

060782803

ABSTRACT:
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 of determining an appropriate time for updating the active reference signal, automatically computing an updated reference signal at the appropriate time, and overwriting the active reference signal with the updated reference signal for use in subsequent computations of the output result.

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