Modeling of a new SMA micro-actuator for active endoscopy applications.

Joël Abadie (1) , Nicolas Chaillet (1) , C. Lexcellent (1)

1 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)

Shape memory alloys (SMA) are good candidates to actuate endoscope heads but the cooling problem must be solved particularly in confined situations. For these reasons, a new SMA micro-actuator specially designed for active endoscopy applications has been developed in our laboratory. This work is a new step in the approach of using integrated thermoelectric cooling with SMA actuators. In fact, the Peltier effect is very attractive in such a case because this reversible phenomenon reduces the overheating of the external environment and provides forced cooling that decreases the response time. In this paper the actuator design and its working principle are presented. A fine modeling of the coupled mechanical and thermal behaviors gives a better understanding of the physical phenomenon involved in the actuator. Finally an experimental prototype has been developed and tested in order to verify the model predictions.

Mots clés: Shape memory alloys; active endoscopy; thermo-electricity; modeling.; modeling

Domaines: Micro et nanotechnologies/Microélectronique

Joël Abadie, Nicolas Chaillet, C. Lexcellent. Modeling of a new SMA micro-actuator for active endoscopy applications.. Mechatronics, 2009, 19 (4), pp.437-442. ⟨10.1016/j.mechatronics.2008.11.010⟩. ⟨hal-00380883⟩