Dec 18, 2006

"power harvesting" from vibrations using piezoelectric materials...

While I have covered this topic many times before. 100's of "new" patents claiming to use this "new" technology.
Power harvesting research has delved into piezoelectric applications mainly due to the development of powerful new composite piezoelectric ceramic materials. The lead titanate zirconate group and even newer lead-free ceramic materials seem to show the most promise for future applications over a range of compositions.  Flexible PVDF materials are even more intriguing.
The latest research revolves around "power harvesting" from vibrations using piezoelectric materials (discussed in early article). Power harvesting is the term used to describe the process of acquiring the energy surrounding a system and converting it into usable electrical energy. This research has been sparked for the need for wireless power sources for the new wireless technology (WiFi laptop computers, Ipods, cell phones, etc.). However, this research has been into mostly low voltage applications.
Why old becomes "new" again. "The rules of physics are the same everywhere in the universe. The rules of men are different everywhere on Earth"

Ref (1) A Review of Power Harvesting from Vibration Using Piezoelectric Materials by H.A. Sodano, D.J. Inman and G. Park, Shock and Vibration Digest, Vol. 36, No.3, pgs 197-206 (2004). 
Ref (2)Piezoelectric Ceramics by Hans Jaffe, Journal of the American Ceramic Society, Volume 41:11, Page 494, November, 1958.
Ref (3) Processing and Piezoelectric Properties of Lead-Free (K,Na) (Nb,Ta) 03 Ceramics, Journal of the American Ceramic Society, Volume 88:5, pages 1190-1196 (2005)