26 Apr '16, 3pm

Flexible film measures heat flow directly

Flexible film measures heat flow directly

Heat flow, analogous to current flow, is generally inferred by measuring temperatures at two points either side of a known thermal resistance. The alternative, measuring heat flow directly, involves placing a sensor right across the heat path. To avoid interrupting flow, this sensor has to have a very low thermal resistance, and it has to generate a measurable quantity proportional to flow. For example, imagine a thin flexible sheet that could be applied to a heatsink to measure the amount of heat leaving it. A team from NEC and Tohoku University have used the longitudinal spin Seebeck (LSSE) effect go some way to creating a thermal flow sensor. The sensor consists of a thin flexible substrate with a magnetic layer on top, and a conductive layer on top of that. Similar to the Hall effect in that it has three orthogonal axes, LSSE does this: When heat flows through the shee...

Full article: http://www.electronicsweekly.com/news/research-news/flexi...

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