Method and apparatus for measuring plant water potential

A psychrometer for measuring plant water potential is constructed by a body member 1 which can be clamped on to the exposed vascular tissue 9, 10 of the stem to form a sealed chamber 3 which is cooled by means of a thermopile (7) mounted on the thin rear wall of chamber 3 and provided with a copper...

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Bibliographic Details
Main Authors PETER ANTHONY COSTIGAN, TERENCE MCBURNEY
Format Patent
LanguageEnglish
Published 29.05.1986
Edition4
Subjects
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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Summary:A psychrometer for measuring plant water potential is constructed by a body member 1 which can be clamped on to the exposed vascular tissue 9, 10 of the stem to form a sealed chamber 3 which is cooled by means of a thermopile (7) mounted on the thin rear wall of chamber 3 and provided with a copper heat sink. The dewpoint within the chamber is determined by means of a fine-wire thermocouple 4. The thermocouple is made by twisting together fine wires of diameter 25 mu m in an apparatus comprising a fixed disc with diametrically opposed jaws through which the wires are fed to diametral clamps on a coaxial rotary disc. Spring guides on the fixed disc maintain the wires in tension as they are twisted together by the rotary disc. Once formed the twisted wires are cut and welded together to form a spherical thermocouple junction.
Bibliography:Application Number: GB19850028779