抄録
The application of image processing to the flow measurement has made great successes such as PIV. But, the demands for the three-dimensional measurement are growing. As holography can record three-dimensional structures, digital holography can be a good candidate for the three-dimensional measurement with a single camera. But, the commonly used in-line hologram suffers the influence of the zero order object beam. Several techniques, so-called "phase shifting", have been proposed to mask this zero order beam. In this study, the Doppler phase-shifting holography has been used to accurately calculate the three-dimensional shape. While this technique uses the Doppler phase-shift to extract the first order diffraction, the shift frequency gives the velocity of an object directly. This implies that the three-dimensional velocity can be measured together with 2-D PIV.
