A feature-based eddy-current imaging system for personal computers: Final report

Technical Report · Wed Mar 01 04:00:00 EST 1989

OSTI ID:6330693

Elmo, P M; Shankar, R

Imaging eddy current nondestructive evaluation (NDE) data on low-cost, field-deployable personal computer (PC) systems is now possible. This report describes the modification of a previously developed feature-based ultrasonic (UT) testing system for automatic eddy current (EC) inspection. This EC system was applied to flat plate and circular geometries. The PC system manipulates the eddy current probe around the part to be inspected; acquires multi-frequency, dual-channel digital data and displays images of an operator-selected channel; and utilizes advanced signal processing software to generate and display impedance-plane trajectories for all frequencies. Laboratory experiments using this eddy current test system on flaw calibration standards, induced intergranular-stress-corrosion-cracking (IGSCC) in retaining ring material coupons, and induced cracks in full size retaining rings have demonstrated the system's capability to detect surface damage. Future efforts will incorporate other problem-relevant signal processing algorithms to aid in detecting and characterizing surface-damage, such as pitting and cracking. 6 refs., 20 figs.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (USA); Jones (J.A.) Applied Research Co., Charlotte, NC (USA)
• OSTI ID: 6330693
• Report Number(s): EPRI-NP-6167
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420500* -- Engineering-- Materials Testing
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
ACOUSTIC TESTING
CALIBRATION
COMPUTER ARCHITECTURE
COMPUTERS
CURRENTS
DATA ANALYSIS
DIGITAL COMPUTERS
DOCUMENT TYPES
EDDY CURRENTS
ELECTRIC CURRENTS
IMAGE PROCESSING
MATERIALS TESTING
MICROCOMPUTERS
NONDESTRUCTIVE TESTING
PROCESSING
PROGRESS REPORT
TESTING
ULTRASONIC TESTING