Development of the solid-state imaging system for the spatio-temporal motion analysis of small particles

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By using a function of the high speed and precision sampling of time-varying intensity distributions in both spatial and temporal regions in a solid-state imaging system, a novel system was developed for obtaining and analyzing images of time-varying small objects with high spatial and temporal resolutions. The system was forther developed for simultaneous measurements of position, size, and refractive index of moving small particles, using the new theory of light scattering by small particles. Main results are summarized in the following :1. Principles of the space-time-resolved acquisition of images in a solid-state imaging system were proposed and revealed by computer simulations based on a mathematical model, and factors were evidently given for affecting a spatial resolution of the system.2. By using the new light scattering theory based on geometrical optics, relations between the characteristics of obtained images and the objective particles were given in simple forms as interference fringes and were revealed experimentally.3. A trial system was realized and applied to measurements of freely falling small glass spheres, and was shown to give the time-resolved information about the size and the one-dimensional position of moving particles.4. By introducing the information about the phase of obtained fringe-like images for analysis, the system was further developed for measuring the two-dimensional motion of particles.5. The developed system was applied to analyze the effects of laser radiation pressure on the particle motion in the laser manipulation. As a result, a new method was proposed for the optical particle sizing utilizing a induced motion of particles by the laser radiation pressure.6. By applying the theory of light scattering based on geometrical optics, a new optical system was proposed for overcoming the defects in the phase/Doppler particle analyzer, and its validity was revealed experimentally.