This thesis will be a brief review of anemometers and their measuring principles. After that, the
thesis focuses on making a hot-wire anemometer for demonstrative purposes. The hot-wire
anemometer will use a platinum resistor as its heating element and a three-dimensional designed
outer casing. The anemometer also uses a fan and control unit to induce airflow into the system.
For reference measurements, another anemometer is used.
This type of hot-wire anemometer can measure airflow in three ways. If it is powered by a
source of constant voltage, the current flowing through the heating element indicates the airflow.
If the hot-wire anemometer is powered by a constant current source, the voltage drop on the
heating element can measure airflow. The third method measures the flow of air by keeping the
heating element at a constant temperature. This is achieved with a small regulatory circuit. With
this constant temperature measuring method, the airflow is reflected by the power used to keep
the heating element hot.
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