How to choose an anemometer
The wind speed (velocity) test includes an average wind speed test and a turbulent component test (turbulent turbulence of 1 to 150 KHz, different from the change). The thermal anemometer measures the average wind speed. The methods for testing the average wind speed are thermal, ultrasonic, impeller, and leather tube, but in these methods, the hot wire anemometer uses the principle of heat dissipation. Next, the measurement methods of these wind speeds will be explained.
Thermal anemometer
This method is to test the change in resistance of the sensor when it is cooled by the wind when it is energized, thereby testing the wind speed. No wind direction information can be drawn.
In addition to being easy to carry and cost-effective, it is widely used as a standard anemometer product.
Some elements of thermal anemometer use platinum wire, thermocouple, semiconductor, but our company uses platinum wire. The material of platinum wire is the most stable materially. Therefore, it has advantages in terms of long-term stability and temperature compensation.
Scope of application: 0.05 ～ 50m / s Display resolution: 0.01m / s Occupancy rate: 80%
Ultrasonic anemometer
This method is to test the ultrasonic time of transmitting a certain distance, and delay the arrival time due to the influence of wind, thereby testing the wind speed.
At the 3rd power, the wind direction can be known.
The sensor part is large, and turbulence may occur around the test part, making the flow irregular. The use is limited.
The popularity is low.
Application range: 0 ～ 10m / s Display resolution: 0.01m / s Occupancy rate: 10%
Impeller anemometer
This method uses the principle of a windmill to test the wind speed by testing the number of revolutions of the impeller.
Used for meteorological observations, etc.
The principle is relatively simple, the price is cheap, but the test accuracy is low, so it is not suitable for the test of micro wind speed and the test of small wind speed changes.
The popularity is low.
Scope of application: 1 ～ 50m / s Display resolution: 0.1m / s Market share: 10%
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