Eddy-current probe characterization
- Jones (J.A.) Applied Research Co., Charlotte, NC (USA)
Characterization of various eddy current coil configurations was accomplished using state-of-the-art digital testing equipment. Program objectives were twofold: (1) to determine optimal detection frequencies for different probe diameters and coil configurations with emphasis on the bobbin-coil; and (2) to identify probe types most sensitive to volumetric and planar tube wall degradation. Optimal signal response for flaw detection was obtained at a frequency near the probe resonance which is determined by the combined electrical characteristics of the eddy current coil and probe cable length. Adding unnecessary lengths of extension cables resulted in poor flaw detection performance. The degraded performance was attributed to change in the probe resonance and the associated reduction in the received signal amplitude. Probe sensitivity tests were conducted with samples containing volumetric and planar flaws using the measured resonant frequency as a primary detection frequency for each probe type. In general, pancake coils offered the highest sensitivity for both volumetric and planar flaws. This report summarizes the results of probe characterization and probe sensitivity tests. 3 refs., 18 figs., 1 tab.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (USA); Jones (J.A.) Applied Research Co., Charlotte, NC (USA)
- Sponsoring Organization:
- EPRI
- OSTI ID:
- 6530182
- Report Number(s):
- EPRI-NP-6990
- Country of Publication:
- United States
- Language:
- English
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42 ENGINEERING
426000 -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
BOILERS
CURRENTS
DESIGN
EDDY CURRENT TESTING
EDDY CURRENTS
ELECTRIC COILS
ELECTRIC CURRENTS
ELECTRIC IMPEDANCE
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC TESTING
EQUIPMENT
FUNCTIONS
IMPEDANCE
IN-SERVICE INSPECTION
INSPECTION
MATERIALS TESTING
NONDESTRUCTIVE TESTING
PROBES
PWR TYPE REACTORS
REACTORS
RESPONSE FUNCTIONS
STEAM GENERATORS
TESTING
TUBES
VAPOR GENERATORS
WATER COOLED REACTORS
WATER MODERATED REACTORS