The feasibility of using a hot-film anemometer in the rain
Abstract
Cylindrical, platinum-coated, hot-film anemometers were struck with a series of individual drops of water while immersed in controlled airflows with velocities ranging from 0.3 to 5.0 m/s. Subjecting the sensor to water drops caused slight, but permanent, changes in calibration. In an effort to overcome calibration changes following drop impacts, a Teflon-coated sensor was also tested. A filtering algorithm was devised to remove drop-caused spikes in the recorded time series. An average spike duration of 0.32 s per drop impact was found, and maximum record loss was estimated to be 1.7% for rainfall rates less than 30 mm/h.
- Publication:
-
Journal of Atmospheric and Oceanic Technology
- Pub Date:
- October 1994
- DOI:
- 10.1175/1520-0426(1994)011<1415:TFOUAH>2.0.CO;2
- Bibcode:
- 1994JAtOT..11.1415D
- Keywords:
-
- Calibrating;
- Drift (Instrumentation);
- Hot-Film Anemometers;
- Rain;
- Wind Velocity;
- Airborne Equipment;
- Platinum;
- Teflon (Trademark)