Note on Characteristics of Blade Wheel Current Meter

Abstract

By using a non-dimensional equation of motion, the responses of the blade wheel current meter are calculated to the step, linear and sine changes of current speed. The results elucidate dynamic characteristics of the current meter, which are of use for estimating errors in measurements and designing new one suitable to the purposes of experiments. The errors are also discussed in the case where the speed of rotation of the blade wheel is calculated on the inverse of the time interval for a finite number of rotation.