A sensor for the direct measurement of leaf wetness: Construction techniques and testing under controlled conditions

Abstract Using a standard design technique of independent, adjacent grid elements, details are given for the construction and testing of a leaf wetness sensor that mounts directly on a leaf. Flexibility in sensor design allows for different configurations to be constructed for different shaped leaves. Guidelines for measurement procedures are also outlined. The sensors were tested by comparing duration of dew for two different cultivars of dry edible beans ( Phaseolus vulgaris L.) under controlled conditions. A description of the chamber used to control the duration of dew is also given.