Sensing water content in microwave oven
时间：04-08
整理：3721RD
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Colleagues,
I need to estimate the water content in a laboratory microwave oven. The oven is used to vaporize the water out of the substrate. The goal is to turn off the generator when enough water have been removed through evaporation.
My gut feeling is that power consumption of the generator would depend on the amount of water in the chamber, provided that geometry remains the same (e.g. beaker with 100cc of sand and 50cc of water vs. same beaker with 100cc of sand 25cc of water). Have anyone used this approach for moisture content sensing Could anyone post some references to books or application notes
Other/additional/alternative types of sensors can be used too. I can modify the oven as much as necessary (even tear it down and put together my own).
Note, however, that question about a specific approach rather than a request for alternative sensing methods. I know a handful of alternative approaches, and I will use some of them in addition to the one in question.
Cheers!
Have a good New Year!
- Nick
I need to estimate the water content in a laboratory microwave oven. The oven is used to vaporize the water out of the substrate. The goal is to turn off the generator when enough water have been removed through evaporation.
My gut feeling is that power consumption of the generator would depend on the amount of water in the chamber, provided that geometry remains the same (e.g. beaker with 100cc of sand and 50cc of water vs. same beaker with 100cc of sand 25cc of water). Have anyone used this approach for moisture content sensing Could anyone post some references to books or application notes
Other/additional/alternative types of sensors can be used too. I can modify the oven as much as necessary (even tear it down and put together my own).
Note, however, that question about a specific approach rather than a request for alternative sensing methods. I know a handful of alternative approaches, and I will use some of them in addition to the one in question.
Cheers!
Have a good New Year!
- Nick
Do you know how much is enough? Most likely, the absorbed energy amount doesn't depend only on the absolute water
quantity but also on it's distribution. Also other microwave absorbing components may be present in the sample.
Generally, a directional coupler can be used to measure the reflected wave. But due to the compact design of a
microwave oven's waveguide, it's possibly difficult to find a suitable place for the detector.
I guess, you also considered a hygrometer placed in the exhaust air.
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