Incerteza na medição de velocidade de fluido usando anemômetro com um único sensor aquecido.

Abstract

In a conventional hot wire anemometer, the heated sensor is influenced both by the speed and the temperature of the fluid. For this reason, it is necessary to use an auxiliary circuit to measure the fluid temperature, so called compensation circuit. The single sensor hot wire anemometer switches the resistors to compensate the fluid temperature. Although this configuration has the advantage of using a single sensor, it has as a disadvantage the uncertainty in the measurement of variable fluid speeds. This paper proposes a mathematical model of the CTA with a single sensor and a solution that minimizes the error in the estimation of variable speeds.