Click on the link below to check out the collection of the Design Articles, Case Studies, Product How-To articles, Teardowns, etc... related to energy scavenging that have been published on Smart Energy Designline.
Click here: http://www.eetimes.com/design/smart-energy-design/4372778/Energy-harvesting---Design-archive
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FYI, Stephane Boisseau and Ghislain Despesse at the CEA-Leti (France) also contributed the article, entitled: "Vibration energy harvesting for wireless sensor networks: Assessments and perspectives".
The link to the article is: http://www.eetimes.com/design/smart-energy-design/4370888/Vibration-energy-harvesting-for-wireless-sensor-networks--Assessments-and-perspectives?pageNumber=2&Ecosystem=smart-energy-design#
Great article indeed; of course Micropelt offers thermoelectric chip-generators (Fig. 6). 100 uW can already be achieved with a temperature difference of just a couple of degrees. Industrial environments offer larger delta-T's, which can create "milliWatts". Thereby also industrial sensors using radio protocols like WHART or ISA100 can be supported by thermal energy harvesting. - Micropelt Germany -