Advanced design level-measuring radars have been developed and installed at Bethlehem Steel's Bums Harbor Plant to measure burden height in operating blast furnaces. Modern signal processing techniques are used in conjunction with a self-calibrating wideband swept-frequency dual-antenna radar to enhance measurement accuracy and better differentiate true surface returns from extraneous reflections. Provisions have been included to monitor and record critical parameters of the radar and various installation accessories to improve maintainability and instrumentation accuracy. A ruggedized personal computer is used to perform the signal processing calculations, determine the distance in terms related to the furnace dimensions, sequence the remote monitoring elements, provide graphic displays of the realtime and historic burden height and monitor data, and operate the complete system from a basic keyboard.
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