Journal
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
Volume 59, Issue 11, Pages 2843-2853Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2010.2046598
Keywords
Corrosion monitoring; maximum-likelihood estimation (MLE); temperature compensation; ultrasound
Funding
- Norwegian Research Council
- Smart Pipe project
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A novel approach for combined corrosion monitoring and temperature compensation (CMTC) using permanently installed immersion ultrasound probes with a well-defined standoff is presented. Combining subsample delay estimation with knowledge of how the sound speed in the immersion fluid and the steel varies with temperature enables us to simultaneously estimate the temperature variations and the changes in wall thickness using a linearized maximum-likelihood estimator (MLE). The results show that submicrometer changes in the wall thickness are detected and that the corrosion rates are predicted in good accordance with theory, also in the presence of temperature variations.
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