Laser Doppler velocimeter

Patent Granted Laser Doppler velocimetry (LDV) , also known as laser Doppler anemometry (LDA), is the technique of using the Doppler shift in a laser beam to measure the velocity in transparent or semi-transparent fluid flows, or the linear or vibratory motion of opaque, reflecting, surfaces.The measurement with LDA is absolute,linear with velocity and requires no pre-calibration.