Porometer and method for stomatal measurements

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

1979-09-04

1982-01-26

Yasich, Daniel M.

Measuring and testing

Moisture content or absorption characteristic of material

By desiccation or extraction

73432R, 364557, G01N 3300, G01N 3348

Patent

active

043122183

ABSTRACT:
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 temperature 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.

REFERENCES:
patent: 3208275 (1965-09-01), Thornthwaite et al.
patent: 3463000 (1969-08-01), Broadwin
patent: 3557617 (1971-01-01), Wilson et al.
patent: 3688309 (1972-08-01), Volberg
patent: 3894419 (1975-07-01), Mator et al.
patent: 3909598 (1975-09-01), Collins
patent: 3973431 (1976-08-01), Ginhou
patent: 4009614 (1977-03-01), Sheppard et al.
patent: 4044238 (1977-08-01), Emschermann et al.
patent: 4160374 (1979-07-01), Crump et al.

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