Probe mapping diagnostic methods

Details Probe mapping diagnostic methods Probe mapping diagnostic methods

G - Physics

01

S

G01S 13/02 (2006.01) G01F 23/284 (2006.01) G01S 7/40 (2006.01) G01S 7/41 (2006.01) G01S 13/10 (2006.01)

Patent

CA 2295330

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 a reference signal along a probe in the vessel, establishing a first fiducial reference point, a reference end of probe location, a measuring length and a maximum probe length. The method also includes the steps of periodically detecting a TDR signal along the probe, establishing a second fiducial reference point, a detected end of probe location, an end of probe peak to peak amplitude, and attempting to determine a process variable reflection on the TDR signal. The method indicates a broken cable condition, a loss of high frequency connection, a low amplitude reflection condition, an empty vessel condition. Distances and locations, on the reference signal are computed in relation to the first fiducial reference point, and distances and locations on the TDR signal are computed in relation to the second fiducial reference point.

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