Stephen M. Walker has written:

'Application of particle image velocimetry to a study of flow about a multi-element airfoil' -- subject(s): Trailing edge flaps, Particle image velocimetry, Flow measurement, Vortices, Wind tunnel tests, Flow distribution

Navid Borhani has written:

'The development and application of a high performance digital particle image velocimetry system'

Mark P. Wernet has written:

'Demonstration of PIV in a transonic compressor' -- subject(s): Transonic compressors, Particle image velocimetry, Turbocompressors

'Fuzzy logic enhanced digital PIV processing software' -- subject(s): Velocity measurement, Particle image velocimetry, Computer programs, Image processing, Flow characteristics, Procedures, Data acquisition

'An investigation of surge in a high-speed centrifugal compressor using digital PIV' -- subject(s): Particle tracking, Velocimetry

'Demonstration of a stabilized alumina/ethanol colloidal dispersion technique for seeding high temperature air flows' -- subject(s): Aerosols, Air flow, Aluminum oxides, Colloids, Ethyl Alcohol, Flow velocity, High temperature air, High temperature tests, Innoculation, Materials tests, Metal powder, PH, Refractory materials, Stabilization

'Laser anemometry techniques for turbine applications' -- subject(s): Turbines, Laser Doppler velocimeter

It's the measure of flow.

Laser Doppler velocimetry also known as Laser Doppler anemometry, is the technique of using the doppler shift to measure the velocity in transparent fluid flows reflecting surfaces.