Pseudorandom binary sequence apparatus and method for in-line inspection tool
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United States of America Patent
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Dec 4, 2012
Grant Date -
Nov 18, 2010
app pub date -
Aug 7, 2009
filing date -
Aug 8, 2008
priority date (Note) -
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Abstract
An in-line inspection tool is disclosed for inspecting the wall of a pipeline while traveling therethrough. The in-line inspection tool may include a transmitter, a signal generator, one or more receivers, and a decoder. The signal generator may generate a pseudorandom signal, generate an inspection signal, and drive the transmitter with a convolution of the pseudorandom signal and the inspection signal. The transmitter may transmit the convoluted signal to the wall of the pipeline. One or more receivers may receive from the wall of the pipeline a received signal comprising at least one of the convoluted signal and a reflection of the convoluted signal. The decoder may identify the inspection signal within the received signal by cross correlating the received signal and the pseudorandom signal.
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