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Etude, conception et réalisation d'un capteur de micro et nano-forces. Application à la mesure d'élasticité des ovocytes.

Abstract : In the microrobotic field, the handling of small objects is needed. In order to characterize interactions in the considered working dimensions, force measurements is necessary. Accordingly, we developed a force sensor which uses a passive magnetic levitation principle. Thus, we did not need control loop to ensure the levitation. Total dimensions of the sensor did not exceed a volume of 170 mm x 100 mm x 60 mm. The sensor is formed of a polymeric material leg, being used as effector, on which two permanent magnets are fixed. The leg unit and permanent magnets levitate between two graphite plates using a particular configuration of magnetic bearing. Force measurements with the developed sensor can be done mainly along three directions. The use of this sensor makes it possible to perform force measurements in the range of a few tens of nanonewton (nN) to several milliNewton (mN) with a nanNewton resolution. Both of the magnetic and diamagnetic modeling make it possible to calculate forces according to the position of the suspended magnets. This sensor is currently used for determination of the mechanical characteristics of human cells such as oocyte. This work is undertaken in close cooperation with fertilization team of the CHU of Besançon.
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https://tel.archives-ouvertes.fr/tel-00259349
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Submitted on : Wednesday, February 27, 2008 - 4:30:41 PM
Last modification on : Thursday, November 12, 2020 - 9:42:34 AM
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  • HAL Id : tel-00259349, version 1

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Mehdi Boukallel. Etude, conception et réalisation d'un capteur de micro et nano-forces. Application à la mesure d'élasticité des ovocytes.. Automatique / Robotique. Université de Franche-Comté, 2003. Français. ⟨tel-00259349⟩

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