DEEP FIELD NOISE IN HOLOGRAPHIC PARTICLE IMAGE VELOCIMETRY (HPIV) - NUMERICAL AND EXPERIMENTAL PARTICLE IMAGE FIELD MODELING

Holographic recording overcomes the limits in 2-D particle image veloc imetry (PIV) to cover a 3-D flow field volume. Interrogation by focusi ng on single planes in a reconstructed particle field is disturbed by noise from out-of-focus particles. A numerical simulation models image reconstruction and shows how validation rates depend on aperture and volume depth. An experimental model environment of scattering particle s in moveable plastic slices gives support to the numerical results. S imulations and tests are carried out for interrogation by autocorrelat ion and crosscorrelation techniques and furnish guidelines for system design.