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This paper presents the technique of digital holographic particle image velocimetry (DHPIV) with a spatio-temporal derivative method for the velocity measurement in 3D space and the evaluation results on it's measurement accuracy. In this technique, hologram patterns are observed as a digital image by an electronic camera such as CCD or CMOS and image reconstruction is carried out on a personal computer. Since in-line observation system is utilized in the conventional digital holography, numerical reconstructed image is much enlarged in depth direction and its depth resolution is extremely poor, hence the measurement accurahy in depth is not accurate in the digital holographic measurement. To overcome this difficulty, we apply a spatio-temporal derivative method to this technique for the detection of particle displacement along z-axis. In numerical simulation, measurement accuracy is evaluated for multi particle model and cubic cavity flow model. Furthermore, we examine the effect of noise on displacement measurement accuracy for noisy hologram patterns numerically constructed.

3D Flow Measurement by Means of DHPIV with a Spatio-Temporal Derivative Method (Evaluation of the Measurement Accuracy with Numerical Simulation)