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Abstract

A method and apparatus for producing a color strip display of eddy current test data from a signal produced by an eddy current detector and which varies in amplitude and in phase relative to a reference signal as the detector is displaced relative to a test body. In order to produce the display, a signal representative of the relative displacement of the detector, a signal representative of the amplitude of the detector signal, and a signal representative of the relative phase of the detector signal are produced and the representative signals are supplied to a color display device for producing a strip display which extends along a path determined by the signal representative of the relative displacement of the detector, has an amplitude perpendicular to the path which is a function of the signal representative of the amplitude of the detector signal, and has a color the hue of which is a function of the signal representative of the relative phase of the detector signal.

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First Claim