Porometer and method for stomatal measurements

Details Porometer and method for stomatal measurements Porometer and method for stomatal measurements

G - Physics

01

N

354/21, 73/78

G01N 15/08 (2006.01)

Patent

CA 1138223

ABSTRACT OF THE DISCLOSURE To measure stomatal resistance of a leaf, signals are obtained from: (1) a small thermocouple positioned adjacent to the leaf in a cuvette to measure tempera- ture of the leaf without conducting excessive heat; (2) a thermistor in the cuvette chamber; and (3) a moisture sensor in the chamber. The moisture signal automatically controls a magnetically operated bypass valve from a source of air flowing through the cuvette chamber so that the moisture remains constant while the flow rate of the air is varied. The flow rate is measured in a flow meter having two laminar paths in series, composed of equal-length equal-diameter tubes but differing in the number of tubes, with the flow rate being measured in a different one of two tubes in each path for different scale measurements.

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