Measuring and testing – Instrument proving or calibrating – Apparatus for measuring by use of vibration or apparatus for...
Reexamination Certificate
2007-03-08
2009-11-03
Raevis, Robert R (Department: 2856)
Measuring and testing
Instrument proving or calibrating
Apparatus for measuring by use of vibration or apparatus for...
C073S631000, C073S598000
Reexamination Certificate
active
07610791
ABSTRACT:
Systems and methods are described that carry out an intelligent, variable, time-gain control (TGC) of signal amplification in a long-range, guided-wave inspection and monitoring system. The systems and methods compensate for signal attenuation over the longer distances that guided-wave inspection techniques are capable of operating with. The sensor signal received is divided into relevant frequency bands that are each subjected to a variable TGC through separate variable gain amplifiers (VGAs). The gain selection is processor controlled through the use of a digital look-up table (LUT) stored with predetermined gain functions and/or data that are both time and frequency specific. The signal components are re-combined and digitized for further signal analysis and defect detection. The LUT is established through one or more methods including a weld signal amplitude equalization approach and a background noise equalization approach.
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Kwun Hegeon
Peterson Ronald H.
Kammer Browning PLLC
Raevis Robert R
Southwest Research Institute
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