A Free-Standing, Thick-Film Piezoelectric Energy Harvester

Kok, S. L., White, N. M. and Harris, N. R. (2008) A Free-Standing, Thick-Film Piezoelectric Energy Harvester. At IEEE Sensors 2008, Lecce, Italy, 26 - 29 Oct 2008.


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In this paper, free-standing structures in the form of cantilevers, fabricated by using a combination of conventional thick-film technology and sacrificial layer techniques, is proposed. These structures were designed to operate as energy harvesters at low-levels of ambient vibration and were characterised using a shaker table over a range of frequencies and acceleration levels. A cantilever with dimensions of 13.5 mm long by 9 mm wide and total thickness of 192 micron was found to have Young’s modulus of 3.8 x 10 N/m2, effective mass of 0.035g and spring constant of 362 N/m. Samples of length 18 mm and functional elements (Lead Zirconate Titanate, PZT) of thickness 80 m were found to produce an output voltage of up to 130 mV at their resonant frequency of 229 Hz, for an acceleration level of 0.981 ms-2 when driving into a resistive load of 60 kOhm. The addition of a proof mass was shown to improve the electrical output power generation. In a series of experiments, the electric power generated by a beam having a proof mass of 2.2 g, resulted in a nine-fold improvement of output power compared to a device with no proof mass. The size of the proof mass is also an important factor in determining the output power of the device.

Item Type: Conference or Workshop Item (Speech)
Additional Information: Event Dates: 26 - 29 October 2008
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > EEE
ePrint ID: 266156
Date Deposited: 18 Jul 2008 10:36
Last Modified: 27 Mar 2014 20:11
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/266156

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