A novel technique for biological kinematic analysis is proposed that makes use of the pseudophase singularities in a complex signal generated from a speckle-like pattern. In addition to the information about the locations and the anisotropic core structures of the pseudophase singularities, we also detect the spatial structures of a cluster of phase singularities, which serves as a unique constellation characterizing the mutual position relation between the individual pseudophase singularities. Experimental results of in vivo measurements for a swimming fish along with its kinematic analysis are presented, which demonstrate the validity of the proposed technique. (c) 2008 Optical Society of America.
Wang, W., Qiao, Y., Ishijima, R., Yokozeki, T., Honda, D., Matsuda, A., Hanson, S. G., & Takeda, M. (2008). Constellation of phase singularities in a speckle-like pattern for optical vortex metrology applied to biological kinematic analysis. Optics Express, 16(18), 13908-13917. https://doi.org/10.1364/OE.16.013908