Title :
Ultrasonic Energy Transmission and Conversion Using a 2-D MEMS Resonator
Author :
Zhu, Y. ; Moheimani, S.O.R. ; Yuce, M.R.
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Univ. of Newcastle, Callaghan, NSW, Australia
fDate :
4/1/2010 12:00:00 AM
Abstract :
This letter reports a novel ultrasonic-based method to power biosensors. Compared with commonly used radio-frequency radiation methods, ultrasonic power transmission is relatively safe for the human body and does not cause electronic interference. To extract ambient kinetic energy with arbitrary motion directions, a novel 2-D microelectromechanical systems energy converter is designed with resonance frequencies of 38520 and 38725 Hz. Working in the diagonal direction, the device has a bandwidth of 302 Hz, which is twice wider than that of a comparable 1-D resonator device. A storage capacitor is charged up to 0.95 V in 15 s, when the converter is driven by an ultrasonic transducer at a distance of 0.5 cm, indicating the energy-conversion capability of 21.4 nW.
Keywords :
biosensors; capacitor storage; direct energy conversion; micromechanical resonators; ultrasonic transducers; ultrasonic transmission; 1D resonator device; 2D MEMS resonator; ambient kinetic energy; arbitrary motion directions; bandwidth 302 Hz; biosensors; distance 0.5 cm; electronic interference; energy conversion; energy converter; energy-conversion capability; frequency 38520 Hz; frequency 38725 Hz; human body; microelectromechanical systems; power 21.4 nW; radio-frequency radiation methods; resonance frequency; storage capacitor; time 15 s; ultrasonic energy transmission; ultrasonic power transmission; ultrasonic transducer; voltage 0.95 V; Energy converter; implantable biosensor; microelectromechanical systems (MEMS); ultrasonic transmission;
Journal_Title :
Electron Device Letters, IEEE
DOI :
10.1109/LED.2010.2040575
