Dear Marc
I have seen advertised a moisture meter for wood that does not use penetrating electrodes it might operate electromagnetically not sure. I am still trying to relocate it. It might work for any water-containing material. Regards Crispin Here are a few notes on a related area: fuel moisture sensors. We researched this a bit for measuring the moisture content of rice husk quickly in the field. It was easy to find wood moisture sensors in the market, but nothing was suitable for rice husk. It turns out that the operating principle behind moisture sensors is pretty simple: you stick two leads into a materials and measure the voltage drop across them (a resistance sensor). You can also do it with capacitance. The dead simplest way to implement is two rusty nails and a multimeter. But here's a slightly better way: "DIY Cheap soil moisture sensor" http://www.cheapvegetablegardener.com/how-to-make-cheap-soil-moisture-sensor -2/ For rice husk, we would end up needing to use plates to get enough contact area for a reliable reading. I think that's how the lab instruments for this stuff work e.g. "Moisture spear"s http://www.qclabequipment.com/SINARSPMOISTUREPROBE.html Ended up not getting past the parts collection phase of this project! Marc Paré B.S. Mechanical Engineering Georgia Institute of Technology | Université de Technologie de Compiègne
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