5. Alternatives to the use of conventional sensors
Although SWD is commonly measured with electronic or mechanical sensors
there are a number of alternatives
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1. Dew point hygrometers
1.1: OPTICAL DEW-POINT HYGROMETER
AND SENSOR made by : OPTIGUIDE LTD.
1.2 New Optical method to measure leaf wetness
by B.H. Heusinkveld.
so in the 10th Symposium on Meteorological Observations and Instrumentation,
p
300, AMS 11 - 16 Jan. 1998.
2. Infra-red thermometry
2.1
John Sadler's methodology
3. Dew point depression
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