Patent ID: 9243883
Filing Date: 2016-01-26
CPC Classification: G01B,G01N

Claim Text:
1. An eddy current system for measuring conductivity or thicknesses of test objects of different categories, comprising: a plurality of standard test blocks matching categories of the test objects, the blocks all having corresponding standard testing points, each with target values of conductivity and thickness; a probe configured to excite eddy current into one of the blocks, one of testing points at a time, to sense response signals and to produce an electrical output representative of the response signals; a data acquisition unit producing amplitude and phase values based on the response signals; a computation unit configured to produce values of un-calibrated values of conductivity or thickness for the corresponding testing point of the corresponding block, a calibration module configured to provide conductivity or thickness correction data specific to the probe, based on the target values and the un-calibrated values of conductivity or thickness; wherein the computation unit is further configured to be calibrated according to the correction data, and is configure to conduct tests by using the probe on the test objects of corresponding category of the one of the blocks.