Method of testing fast-changing and pulsating flows by means of a hot-wire anemometer with simultaneous measurement of voltage and current of the sensor
P. Ligęza
Abstract
Research on the optimization of the frequency bandwidth of calorimetric anemometers with hot-wire sensors, intended for the study of fast-changing and pulsed flows, is undergoing constant progress. The miniaturization of sensors reduces the thermal inertia of the measuring element, the structure of the electronic system and parameters of its elements are optimized, methods and algorithms for processing the output signal are developed. In a classic hot-wire anemometer, a single analog signal from the system is converted into a signal proportional to the measured velocity using the static calibration function of the anemometer. The article describes a method that simultaneously uses two measurement signals from an anemometer, proportional to the voltage and current of the sensor. Based on these signals, the measured flow velocity is calculated using a dynamic model of the sensor. This allows the measurement system's bandwidth to be extended and dynamic errors to be minimized.