Time resolved PIV analysis
FD4 Correlation is an algorithm developed for the Time Resolved PIV. It offers the frequency analysis of the velocity fluctuation at each PIV grid and the sophisticated spatiotemporal validation.
In the conventional in-plain (2D) PIV analysis, outliers are detected using spatial validation and flip the value by the interpolation. In the Time Resolved PIV, since each vector map is very close in time, a spatiotemporal validation can be applied.
FD4 Correlation offers most advanced spatiotemporal validation. The spectrum of each grid is analyzed applying an FFT. Then the high frequency noise is filtered out and then an inverse FFT is applied to get back the time domain velocity date without high frequency noise. Using this velocity fluctuation curve, outliers are replaced with the best estimated value at each time at each grid.
