EFFECTS OF FEEDBACK PHASE IN AN EDDY-CURRENT FLAW DETECTOR ON THE RESPONSE TO DISPLACEMENT AND EFFECTS.

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Milyaev, D.V.
Panasyuchenko, A.M.
Nesterov, A.M.
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ELECTRIC MEASUREMENTS - Frequency - ELECTRONIC CIRCUITS - Tuning;
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摘要
The effects of feedback phase are examined for an oscillator whose tuned circuit contains an eddy-current probe, with particular emphasis on the sensitivity to radial displacements and longitudinal defects in nonmagnetic components. It is shown that the influence of displacements can be eliminated. A method is given which is called phase-frequency selection. Two types of flaw detectors are compared which use phase-amplitude and phase-frequency selection, respectively.
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页码:356 / 358
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