Thermal anemometry method and thermal anemometer for measuring a flow velocity of a flowing fluid at a high temporal resolution

A thermal anemometer for measuring a flow velocity of a flowing fluid, the thermal anemometer comprising

• a probe,
• a controller for passing an electric current through the probe, and
• a measure and evaluation device,
• wherein the controller and the measure and evaluation device are configured for passing an electric current through the probe such as to heat up the probe to a temperature that is higher than an ambient temperature,
• measuring an amperage of the electric current through the heated probe and a voltage dropping over the heated probe, while the electric current heating up the probe is passed through the heated probe,
• determining
• a temperature of the heated probe,
• a change in the temperature of the heated probe and
• an electric power supplied to the heated probe by the electric current during the change in the temperature of the heated probe from the amperage measured and the voltage measured,
• determining a flow velocity of the flowing fluid using the temperature of the heated probe, the change in the temperature of the heated probe, the electric power supplied to the heated probe and a heat capacity of the heated probe.