Apparatus for measuring sap flow

Details Apparatus for measuring sap flow Apparatus for measuring sap flow

1993-11-01

1994-08-16

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

7320424, G01F 168

Patent

active

053376048

ABSTRACT:
A device for measuring sap flow in a stem region comprises a rigid housing, configured like a clam-shell, and insulated and sealed from intrusion from radiation or water or weather by a collar which circumscribes the housing situated around the stem region being measured. Enclosed within this housing is a substrate preferably constructed from a composite of foam tape and rubber gasket material to provide a means for the electronics to conform to a diversity of stem cross-sections and irregularities. Temperature-sensing electronics measure energy transferred from an internal heater strip to the ambient, to the stem region, and to measure heat flowing up the stem. Heat transfer related to sap flow in a stem region is determined from four signals, two signals provided by two pair of differential thermocouples, a signal generated from a thermopile, and a signal indicative of the millivoltage delivered to the heater.

REFERENCES:
patent: 4384578 (1983-05-01), Winkler
patent: 4745805 (1988-05-01), Granier
patent: 4817427 (1989-04-01), Kitano et al.

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