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Abstract
Thermal anemometers based on self-heated thermistors with negative temperature coefficients are a robust, sensitive and low-cost alternative to standard hot-wire anemometers in wind turbine characterization and optimization. However, changes in ambient temperature greatly affect the accuracy in wind speed measurements of these devices. In this paper, a temperature compensation method incorporating two thermistors with negative temperature coefficients is experimentally investigated. A temperature compensated anemometer circuit is proposed. The effectiveness of the implemented temperature compensation method is verified over a span of 16 ℃ for two different air velocities. To account for a possible thermistor mismatch, a correction procedure is proposed and verified. In the end, it is shown that the air temperature can be reconstructed from the uncompensated anemometer outputs as well.
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