A non-contact eddy current inspection system provides for compensation for variations in the distance between the eddy current probe and the workpiece surface. Probe height from the surface is first determined for a scan using a vector analysis of the signals through inductive coils. Height compensated...http://www.google.com.au/patents/US5130651?utm_source=gb-gplus-sharePatent US5130651 - Method and apparatus for providing compensation for variations in probe-surface separation in non-contact eddy current inspection systems
