Device for measuring water flow rate in plant stem

Details Device for measuring water flow rate in plant stem Device for measuring water flow rate in plant stem

1988-05-20

1989-04-04

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

47 1R, G01F 168

Patent

active

048174270

ABSTRACT:
The disclosed device includes a heater mounted on a plant stem for generating a heat flow Q so as to give a heat supply (Q-Q.sub.o) to water flow in the stem, Q.sub.o being heat loss, a means for controlling heat loss Q.sub.o or heat dissipation through surfaces of the heater and the plant stem at a constant level, a means for measuring difference of the stem temperature between the upstream and downstream ends of the heater, and a means for determining the water flow rate in the plant stem from the above temperature difference and the input power to the heater.

REFERENCES:
patent: 4339949 (1982-07-01), Bahner et al.
patent: 4745805 (1988-05-01), Granier

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