Measuring and testing – Moisture content or absorption characteristic of material – By desiccation or extraction
Patent
1978-04-24
1979-07-10
Ruehl, Charles A.
Measuring and testing
Moisture content or absorption characteristic of material
By desiccation or extraction
73 38, G01N 3300
Patent
active
041603745
ABSTRACT:
Apparatus for measuring the diffusive resistance of plant stomata includes a cup adapted to be sealingly clamped to a plant leaf being tested to define an enclosed air volume in the cap adjacent the surface of the leaf. A humidity sensor in the cup provides a signal indicative of the humidity of the air in the cup. Control means are provided to receive the output signal from the humidity sensor and are operative to start a counter at a lower set humidity value and to stop the counter at an upper set humidity value thereby to time the rise in humidity between the lower and upper values. Drying means for drying the air within the cup down to a value below the lower set humidity value after each measurement cycle are provided. The control means are adjustable to vary the lower or upper set humidity value and to vary the difference between the lower and upper set humidity values.
REFERENCES:
patent: 3463000 (1969-08-01), Broadwin
patent: 3504527 (1970-04-01), Marshall
patent: 3688309 (1972-08-01), Volberg
patent: 3973431 (1976-08-01), Ginhoux et al.
Crump Janet M.
Crump Terence J.
Jeffery Donald D.
Roskos Joseph W.
Ruehl Charles A.
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