Non-destructive control device using eddy currents

G - Physics – 01 – N

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G01N 27/90 (2006.01)

Patent

CA 2058522

Non-destructive Foucault-current control device, including a generator composed of a quartz oscillator and programmable frequency dividers; a power amplifier, providing a periodic excitation signal, square in shape; two coils electromagnetically coupled with a metallic control piece; means of measurement comprising two synchronous detectors to measure the real and the imaginary parts of the difference in complex impedances of the coils. The generator's frequency stability leads to an amelioration of the precision of the impedance measurements, when these measurements are made at various frequencies. The invention is meant to be applied in the non-destructive control of metallic parts by Foucault currents, at various frequenciees.

Dispositif de contrôle non destructif à courants de Foucault, incluant un générateur constitué d'un oscillateur à quartz et de diviseurs de fréquence programmable; un amplificateur de puissance, fournissant un signal périodique d'excitation, de forme carrée; deux bobines couplées électromagnétiquement à une pièce métallique à contrôler; des moyens de mesure comportant deux détecteurs synchrones pour mesurer la partie réelle et la partie imaginaire de la différence des impédances complexes des bobines. La stabilité en fréquence du générateur procure une amélioration de la précision des mesures d'impédance, lorsque ces mesures sont faites à différentes fréquences. L'invention trouve une application dans le contrôle non destructif de pièces métalliques par courants de Foucault, à différentes fréquences.

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