Acoustic Doppler velocimetry ( ADV ) is designed to record instantaneous velocity components at a single point with a relatively high frequency.

* Acoustic Doppler Velocimetry, in flow measurement

* Laser Doppler velocimetry

A related technology is acoustic Doppler velocimetry.

* Laser Doppler velocimetry

* In planar Doppler velocimetry ( optical flow meter measurement ), TOF measurements are made perpendicular to the flow by timing when individual particles cross two or more locations along the flow ( collinear measurements would require generally high flow velocities and extremely narrow-band optical filters ).

* Derakhshandeh, B. Vlassopolous D., and Hatzikiriakos S. G., Thixotropy, Yielding and ultrasonic Doppler velocimetry in pulp fibre suspensions, in Rheologica Acta DOI 10. 1007 / s00397-011-0577-7, 2011 )

* Laser Doppler velocimetry

* Photon Doppler velocimetry

Special lasers perform “ Doppler velocimetry ,” that produces a 3-D image allowing inspection of an object ’ s flow properties.

Other techniques used to measure flows are laser Doppler velocimetry and hot-wire anemometry.

* Laser Doppler velocimetry

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.

Laser Doppler velocimetry is often chosen over other forms of flow measurement because the equipment can be outside of the flow being measured and therefore has no effect on the flow.

Laser Doppler velocimetry is used in hemodynamics research as a technique to partially quantify blood flow in human tissues such as skin.

Laser Doppler velocimetry is effective in measuring surface vibrations via reflection of the laser light from the vibrating surface.

Laser Doppler velocimetry has been employed in laser computer mouse.

* Photon Doppler velocimetry

* Photon Doppler velocimetry

* Planar Doppler velocimetry

Methods of velocimetry include particle image velocimetry and particle tracking velocimetry, Molecular tagging velocimetry, laser-based interferometry, ultrasonic Doppler methods, Doppler sensors, and new signal processing methodologies.