Device for measuring water flow rate in plant stem
US4817427A · kind A · utility
11Cited by
2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 20, 1988 |
| Grant date | Apr 4, 1989 |
| Priority date | — |
| Expiry date | May 20, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/6847
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.