Monte Carlo simulation of false alarms and detection reliability in magnetic flux leakage inspection of steel tubes
- Fundacion para el Desarrollo Tecnologico, Buenos Aires (Argentina)
- TECHINT, Buenos Aires (Argentina)
The same flaw gives rise to different signals when inspected by the same nondestructive testing (NDT) equipment under closely similar circumstances. A laboratory example involving six identical cracks is shown. This is a consequence of unavoidable fluctuations in the parameters that influence the detection process and is illustrated using a Monte Carlo simulation based on a numerical model of crack detection in steel pipes by magnetic flux leakage. The effects of these uncertainties on the fault detection reliability and on the appearance of false alarms are analyzed. The occurrence of Type I errors (lack of detection of unacceptable defects) and Type II errors (false alarms) is studied as a function of the detection threshold, and guidelines for improving detection efficiency are suggested.
- OSTI ID:
- 413376
- Journal Information:
- Materials Evaluation, Vol. 54, Issue 9; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
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