[PIC]: How to measure level of liquids and senserelativehumidity?
Mike Witherden email (remove spam text)
1 ¸ c worth:
Dual band Infra Red transducers would also work and can be calibrated very accurately.
The absorption and reflection of Infra Red by a substance is greatly affected by the
substances water content. Using 2 bands of Infra Red improves the effect.
The normal method of measuring effective humidity in wood, concrete, sand,
etc., is by conductivity.
See also: www.piclist.com/techref/microchip/devices.htm?key=pic
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