An Improved Bead Thermistor Anemometer for Use in Plant Canopies

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Abstract
A small, inexpensive anemometer suitable for use in plant canopies was constructed using bead thermistors in a constant-temperature configuration. It overcomes the directional dependence associated with a single thermistor by using twin beads mounted at right angles. The anemometer was calibrated using a pendulum as a velocity standard and achieved an accuracy of .+-. 0.03 m/s for wind speeds in the 0-2 m/s range. Two anemometers operated successfully within grapevine canopies for a complete season.

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