1 Department of Micro- and Nanotechnology, Technical University of Denmark2 Silicon Microtechnology, Department of Micro- and Nanotechnology, Technical University of Denmark3 MEMS-AppliedSensors, Department of Micro- and Nanotechnology, Technical University of Denmark4 Experimental Surface and Nanomaterials Physics, Department of Physics, Technical University of Denmark5 Tongji University6 unknown7 Tongji University
We propose a polymer electret based energy harvesting device in order to extract energy from vibration sources with low acceleration. With MEMS technology, a silicon structure is fabricated which can resonate in 2D directions. Thanks to the excellent mechanical properties of the silicon material, the proof mass could be successfully driven by an external vibrations with acceleration as low as 0.014g (∼0.14 m/s2). A root mean square (RMS) power output of 1.17μW under 0.014g RMS acceleration at 75Hz is measured when an optimal load of 20.3 MΩ is applied. The frequency response of the device is also studied and a high Q factor of 250 is achieved.
Procedia Engineering, 2012, Vol 47, p. 770-773
MEMS; Micro generator; Energy harvesting device; Wireless sensor networks