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Eddy and cheap TDR measurements

While performing long-term stability testing of the WAVE-1 sensor, I
measured increased output noise and substantial drift about 8:00 am for
several mornings while my sensor was suspended in ambient room air.
Investigation revealed that the sensor responded to miniscule changes in
water vapor in the air around the sensor due to the HVAC cycles.  
The sensor will also readily detect moisture content in breath.

An analog meter will demonstrate evaporation of condensed moisture from the
sensor's surface which provides some modest entertainment in today's cool
climate.  When the demo unit is first brought indoors, the sensor is cooler
than the room and condenses moisture.  As the sensor surface warms, the
moisture evaporates.  The entire process becomes visible using the meter
attached to the sensor.

Would this ability, combined with the millisecond response performance of
the sensor be useful for directly measuring ET?  

I know that the sensor could be used with thermionic cooling as a hygrometer
very readily.  

I also think that a calibrated surface air flow rate could be employed for
direct measurement of wind chill and frost prediction.

Any takers?

M. G.