A portable rotating disk prototype for LDA calibration

INRIM has developed a LDA calibrator prototype for a speed range between 0.02 m/s and 10 m/s. The prototype has been designed to be rugged, compact and portable in order to be used as a possible transfer device for LDA calibration comparisons. The device is composed by a rotating disk with a surface manufactured that simulates the tracer particles and by an alignment system to adapt the calibrator to different focal lengths and beam angles. Detailed descriptions of this prototype and preliminary results are shown in this paper in order to validate the operating principles.