The technique is non-contacting and non-disturbing and can be applied to rotating spindles. Remote and noncontact measurements are particularly desirable in machine tool applications. The technique may be applied for spindle or tool vibration analysis where one of the orthogonal directions is impossible to measure due to lack of space.The method requires however that the surface structure at the laser measurement points can be made sufficient smoothforthesmootmea- surement and rough for the rough measurement.