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Corrosion Monitoring & Inspection Glossary - A
Aboveground Marker (AGM): A portable device placed on the ground above a pipeline that both detects and records the passage of an in-line inspection tool or transmits a signal that is detected and recorded by the tool.
AC impedance: see Electrochemical impedance spectroscopy (EIS).
Acoustic emission (AE): Corrosion monitoring with AE is based on measuring acoustic sound waves that are emitted during the growth of microscopic defects, such as stress corrosion cracks.
Anomaly: Any kind of imperfection, defect, or critical defect that may be present in a system or material. An indication may be generated by nondestructive examination, such as in-line inspection for pipeline.
Applied Magnetic Field: The strength of the magnetization field that is produced in a pipe wall by a magnetizing system in an in-line inspection tool.
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