Dynamic thresholding for automated analysis of bobbin probe eddy current data
نویسندگان
چکیده
An automated algorithm is presented for the analysis and classification of eddy current bobbin probe data obtained from nuclear power plant steam generator tubes (SGT). This algorithm attempts to find a balance between the two seemingly conflicting requirements of SGT eddy current data analysis, namely, detecting and identifying as many of the actual defects as possible, whilst limiting the number of false alarms to a minimum. Initial results presented in this paper look very promising.
منابع مشابه
Automated Analysis of Eddy Current Signals in Steam Generator Tube Inspection
Accurate and consistent determination of flawed regions in steam generator tubing is becoming increasingly important as nuclear power plants age and repair costs increase. The general problem of assessing the structural integrity of steam generator tubing using eddy current inspection is rather complex due to the presence of noise and interference signals under different inspection conditions. ...
متن کاملA Generalized Likelihood Ratio Technique for Automated Analysis of Bobbin Coil Eddy Current Data
This paper presents a generalized likelihood ratio technique for detection of defect locations from bobbin coil eddy current data. First a Neyman±Pearson (NP) decision rule for detection of known random signals (in presence of noise) is discussed. The result is then generalized to the problem of detection of unknown random signals that are commonly found in bobbin coil eddy current data. The pe...
متن کاملBobbin Eddy Current Signal Analysis of Alloy 600 TT Steam Generator Tube Scale Thickness Based on Electromagnetic Characteristics
A steam generator is the major component of a nuclear power plant and its integrity is crucial for the nuclear safety. Steam generator tube eddy current bobbin inspections are periodically performed for utility to detect tube degradation. Scaled deposits on the steam generator tubes cause the performance degradation problem and the thickness of the outer diameter tube surface can be measured us...
متن کاملComputer-aided Analysis of Eddy Current Rotating Probe Data*
Eddy current (EC) estimate of flaw size obtained from inservice inspection is often the primary means of assessing the structural integrity of steam generator tubes. Reliable prediction of failure pressure and leak rate in tubes with complex cracking requires more detailed information about the geometry and extent of degradation than is generally available from conventional bobbin coil examinat...
متن کاملExperimental Validation of an Eddy Current Probe Dedicated to the Multi-frequency Imaging of Bore Holes
This paper deals with the experimental characterization of an array probe dedicated to the eddy current imaging of sub-millimetric surface breaking defects appearing in bore holes of metallic parts. The probe is constituted of a large inducer generating an uniformly oriented EC flow within the inspected material, and a sensing array probe featuring bobbin coils to sense the radial component of ...
متن کامل