RF Energy Harvesting System for Autonomous Respiratory Sensor in MRI
Megdouda BENAMARA1,2, Asma Bakkali2, tania-del-socorro Vergara Gomez2,3, Camille Raynard2, Christophe Vilmen3, Pierre Jomin2, Amira Trabelsi2,3, Djamel Berrahou1, Marc Dubois1, Yann Le Fur3, Frank Kober3, David Bendahan3, Emmanuel Bergeret4, Matthieu Egels4, Stefan Enoch2, and Redha Abdeddaim2
1Multiwave Imaging, Marseille, France, 2Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France, 3Aix Marseille Univ, CNRS, CRMBM, Marseille, France, 4IM2NP - UMR 7334 CNRS, Aix-Marseille University, Marseille, France, Marseille, France
The energy harvesting system was developed for preclinical 4.7 T MRI scanners. The system is composed of a commercial birdcage coil tuned and matched at 200.1 MHz, a harvesting coil and an RF-DC rectifier. The collected energy was used to power a respiratory pressure sensor. The efficiency of the harvesting system was optimized as function of the angular positioning of the harvesting coil in the birdcage. The experiments were carried out with a water phantom and a mouse in vivo. A peak voltage of 1.5V was harvested for 45V input voltage and delivered to a load of 350 Ω.
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