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Theses

ETIQUETTES MAGNETIQUES INTERROGEABLES A DISTANCE.
APPLICATION A LA MESURE DE TEMPERATURE.

Abstract : This thesis focuses on contactless temperature measurement using magnetic labels and a remote interrogation system. Various soft magnetic, hard or semi hard alloys were used to realize the labels. Their operation is based on magnetic phenomena depending on the temperature, such as the ferromagnetic/paramagnetic state transition at Curie temperature, the demagnetization or the local saturation. The harmonic signature of the labels is remotely interrogated with an alternating excitation field in order to analyze the harmonic variations as a function of temperature. Innovative ideas of magnetic labels enabling the detection of crossing temperature thresholds have been studied on a theoretical basis (theoretical approach) and experimentally validated by measurements : a single NiFe label allows real-time detection ; and an association of NiFe and semi hard alloys provides the memorization of crossing temperature thresholds. Issues on distance between the label and the interrogation system, or on demagnetizing field have also been studied.
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https://tel.archives-ouvertes.fr/tel-00267076
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Submitted on : Wednesday, March 26, 2008 - 2:04:07 PM
Last modification on : Thursday, November 19, 2020 - 1:00:09 PM
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Diana Mavrudieva. ETIQUETTES MAGNETIQUES INTERROGEABLES A DISTANCE.
APPLICATION A LA MESURE DE TEMPERATURE.. Sciences de l'ingénieur [physics]. Institut National Polytechnique de Grenoble - INPG, 2007. Français. ⟨tel-00267076⟩

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