Credit: Light: Science & Applications
a - h The observed power spectrum at the indicated rotational speed over a data collection period of 20 s. i Detailed power spectrum with 0 - 1000 Hz at 100 r/s. j The measured results at different rotating speeds (75 r/s - 100 r/s). k The velocity resolution measurement, there are ten rotational speeds at a step of 0.033 r/s from 99.7 r/s to 100 r/s. For j and k, the red points are the measured data, and the solid blue lines are the theoretical value.