Abstract
An imaging interferometer with low-numerical-aperture objectives and a CCD camera is proposed and studied for application to a particle image velocimetry (PIV) system. Sectional images are obtained based on the optical coherence tomography with the lateral resolution about 40μm. The motion of tracer particles within a coherence gate are detected from difference images between video frames and vector maps are obtained by using auto-correlation PIV. Two types of particle image acquisition conditions are found according to the fringe spacing, which affects the detected motion of tracer particles.
