Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 19, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/19/12/125202
Keywords
energy harvesting; electromagnetic generator; wireless sensor; self-powered systems
Funding
- VIBES [FP6-IST-507911]
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This paper reports the development and implementation of an energy aware autonomous wireless condition monitoring sensor system ( ACMS) powered by ambient vibrations. An electromagnetic ( EM) generator has been designed to harvest sufficient energy to power a radio-frequency (RF) linked accelerometer-based sensor system. The ACMS is energy aware and will adjust the measurement/transmit duty cycle according to the available energy; this is typically every 3 s at 0.6 m s(rms)(-2) acceleration and can be as low as 0.2 m s(rms)(-2) with a duty cycle around 12 min. The EM generator has a volume of only 150 mm(3) producing an average power of 58 mu W at 0.6m s(rms)(-2) acceleration at a frequency of 52 Hz. In addition, a voltage multiplier circuit is shown to increase the electrical damping compared to a purely resistive load; this allows for an average power of 120 mu W to be generated at 1.7 m s(rms)(-2) rms acceleration. The ACMS has been successfully demonstrated on an industrial air compressor and an office air conditioning unit, continuously monitoring vibration levels and thereby simulating a typical condition monitoring application.
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