Etude et conception d'un dispositif de détection de fines particules métalliques

Abstract : This thesis synthesizes the study and the realization of a disposal which purpose is the detection and the elimination of fine metallic, magnetic or non-magnetic particles that may be troublesome if they are included in some manufactured materials. The device is specially designed for purifying granular, powdered or liquid materials that are conveyed t1u'oughout one to several dozen centimeter diameter pipes using a fluid carrier the speed of which is in the range of one to ten meters per second. It is built around two modulus. The first one of them issues an analog signal based on the absorption of energy due to eddy current induction phenomenum when the particle passes through the variable magnetic field of a coil. It makes possible to reach the desired sensitivity without affecting the stability and the fidelity of long term working. The second one, based on Byvaikov algorithm digitally filters the former signal and gives to the disposal all its quality of robustness against electrical, magnetic and/or mechanic disturbances.
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Guy Zaloylo. Etude et conception d'un dispositif de détection de fines particules métalliques. Autre. Université Henri Poincaré - Nancy 1, 1992. Français. ⟨NNT : 1992NAN10037⟩. ⟨tel-01748578⟩

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