Measuring and testing – Volume or rate of flow – Thermal type
Patent
1991-08-06
1993-12-14
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
7320424, G01F 168
Patent
active
052691837
ABSTRACT:
A device for measuring the sap flow in herbaceous plants and trees directly without the necessity of an empirical calibration, using the heat balance method. A strap-on, removable, and reusable collar device powered by a 0.2 to 5.0 watt heater is abuttably affixed to the periphery of a stem or trunk. A plurality of temperature sensors are embedded in a weatherproof collar and shield assembly and are automatically processed by a small battery-operated recorder which also periodically stores in its memory the sap flow rate and the accumulated total thereof. These sap flow rate records may be obtained periodically for further analysis. A method is also provided for mass production thereof.
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Van Bavel Cornelius H. M.
VAN Bavel Michael G.
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