Embedded Files
Cup Anemometer
Cup Anemometer
Operating Principle:
A cup anemometer measures wind speed by utilizing a simple mechanical principle. It consists of three or four cups mounted on horizontal arms attached to a central axis. As the wind blows, the cups rotate around the axis. The speed of rotation is directly proportional to the wind speed.
Advantage: It is simple, reliable, and accurate in measuring wind speed across various conditions.
Disadvantage: It can easily drift with time due to environmental factors
Uncertainty: It is susceptible to overspeeding due to its low threshold, leading to overestimations in wind speed.
Pitot Tube
Pitot Tube
Operating Principle:
A pitot tube measures the total pressure of incoming airflow through the front facing tube and differentiates static pressure from the total pressure on the side-facing hole.
Advantage: It is simple, reliable, and accurate
Disadvantage: It is susceptible to blockages in the tube that can affect measurements
Uncertainty: Can struggle to obtain accurate measurements in very turbulent or gusty environments when wind changes unpredictably.
Hot-wire Anemometer
Hot-wire Anemometer
Operating Principle:
A hot-wire anemometer operates on the principle of convective heat transfer. A thin platinum wire is heated to a constant temperature above the surrounding air. As wind flows past the wire, it carries away heat, causing a change in the wire's resistance. By measuring this change in resistance, the velocity of the wind.
Advantage: It is highly sensitive and responds well to low wind speeds or sudden change.
Disadvantage: It is expensive, and the wire is fragile and easily contaminated by dust and moisture.
Uncertainty: It is affected by atmospheric temperature, so it requires frequent calibration to obtain accurate measurements
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