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The origin and theoretical correction of thermal gradients in thermocouple psychrometers
Author(s) -
VANDERCHMITT E.,
DAUDET F.A.
Publication year - 1994
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1994.tb00270.x
Subject(s) - hygrometer , thermocouple , environmental science , materials science , thermal conduction , heat transfer , radiative transfer , temperature gradient , thermal , mechanics , thermodynamics , humidity , optics , meteorology , physics , composite material
Temperature‐compensated psychrometers are explained and a theoretical correction for temperature gradients, with its boundaries, is given. The correction was elaborated for in situ determination of water potential on soybean and tomato stems where it was indispensable. The origin of the thermal gradients in the psychrometric chamber is then discussed. Cooling of the conducting tissue by the circulation of xylem sap seemed to be the major cause for these gradients, while the heating of the psychrometer (thermally insulated) by the surroundings through radiative or conductive transfer was negligible.