In-plane laser vibrometers measure continuous (DC) velocity and superimposed variable (AC) components perpendicular to the central axis of two converging laser beams. The system utilizes the Doppler effect, where motion causes an optical frequency shift of light back-scattered from the measured surface.
Such measurements are important in many areas including the study and development of tape drives, ultrasonic knives and scalpels, photocopiers, printers, belt drives and other traversing parts where slippage and vibration can be a problem. |
