State of the art in acoustic energy harvesting

For portable and embedded smart, wireless electronic systems, energy harvesting from the ambient energy sources has gained immense interest in recent years. Several ambient energies exist in the environment of wireless sensor nodes (WSNs) that include thermal, solar, vibration and acoustic energy. T...

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Bibliographic Details
Published in:Journal of micromechanics and microengineering 2015-02, Vol.25 (2), p.23001-13
Main Authors: Khan, Farid Ullah, Izhar
Format: Article
Language:English
Subjects:
acoustic
Acoustics
Autonomous
Direct power generation
electromagnetic
Energy harvesting
Helmholtz resonator
piezoelectric
Piezoelectricity
Resonant frequencies
Sensors
sound pressure level
Vibration
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Summary:For portable and embedded smart, wireless electronic systems, energy harvesting from the ambient energy sources has gained immense interest in recent years. Several ambient energies exist in the environment of wireless sensor nodes (WSNs) that include thermal, solar, vibration and acoustic energy. This paper presents the recent development in the field of acoustic energy harvesters (AEHs). AEHs convert the acoustic energy into useful electrical energy for the operation of autonomous wireless sensors. Mainly, two types of AEHs (electromagnetic and piezoelectric based) have been developed and reported in literature. The power produced by the reported piezoelectric AEHs ranges from 0.68 pW to 30 mW; however, the power generation of the developed electromagnetic AEHs is in the range of 1.5-1.96 mW. The overall size of most of the developed piezoelectric and electromagnetic AEHs are quite comparable and in millimeter scale. The resonant frequencies of electromagnetic AEHs are on the lower side (143-470 Hz), than that of piezoelectric AEHs (146 Hz-16.7 kHz).
ISSN:0960-1317
1361-6439
DOI:10.1088/0960-1317/25/2/023001