Advanced PIV Interrogation Schemes

Many advanced PIV processing algorithms have been developed in the last few years to improve data yield and get higher accuracy. The overview of these schemes is provided in the following sections. 

It should be noted that the intensity values are discretized, and therefore, the correlation values exist only for integral shifts. A variety of methods are used to estimate the location of 

The total error in PIV measurements can be decomposed into bias error and random error as 

Bias error, , ias, corresponds to over or under estimation of the velocity vector. This may be due to error in calibration. The rms error, corresponds to the randomness of experimental parameter during measurements. One approach in the evaluation of rms error during PIV measurements is PIV recording of the static (quiescent) flow. This approach permits the study on experimental parameters such as particle image diameter and background noise. 

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