Electronics > Beginners
Mass flow sensor
mikerj:
--- Quote from: Simon on May 12, 2019, 10:17:02 am ---
--- Quote from: mikerj on May 12, 2019, 10:12:08 am ---
The higher the wind speed, the more power you have to dump into the sensor to maintain its temperature and therefore the higher the voltage across it.
--- End quote ---
i think most comercial sensors use the current draw by the hot wire to maintain a stable temperature as the actual signal.
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It doesn't make much difference if it's current controlled or voltage controlled, you get the same square law response (P=V^2/R or P=I^2R). If you want a linear output you need to measure heater power, though this is more difficult with a purely analog solution (log amps etc).
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