PROCESSOR APPARATUS AND METHOD FOR A PROCESS MEASUREMENT SIGNAL

摘要

A method and apparatus for processing a time domain reflectometry (TDR) signal to generate an output result corresponding to a valid process variable. The method comprises processing the TDR signal using at least two different techniques for detecting a valid reflection pulse generated by the process variable to calculate an independent result using each of the two of the at least two techniques, applying a weighted factor to the independent results from each of the at least two different techniques to provide weighted output results, comparing the weighted output results and selecting the valid output result from the weighted output results based on the comparing step. The apparatus comprises a primary detector for detecting the reflection pulse generated by the process variable and calculating a primary output, a secondary detector for detecting the reflection pulse generated by the process variable and calculating at least one secondary output result, a comparator for comparing the primary result with the at least one secondary result to check the primary result and to select the valid output result based on the comparison. The present invention provides an apparatus and method for accurately providing information as to the location of an interface between a first medium and a second medium in a vessel.