Brownian Motion Captured with a Self-Mixing Laser(SCHOOL OF INFORMATION TECHNOLOGY AND ELECTRONICS)
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概要
- 論文の詳細を見る
We report on our successful real-time measurement of the dynamic frequency-shift of light by particles in Brownian motion through self-mixing laser spectroscopy with extreme optical sensitivity. We demonstrated successful particle sizing and calculating particle-size distributions from modulated power spectra. From the demodulated signals, it was found that the changes over time in the non-stationary random walks of small particles suspended in water result in different averaged dynamics when the field of vision for particles seen by the laser beam (scale of the observation) is changed. At a small focal volume of the laser beam, in which the relevant diffusion broadening is observed, the averaged motion which can be represented by the motion of a "virtual" single particle, whose velocity possesses a Gaussian-white property. The average motion is found to constitute stationary fluctuations, featuring random sequences of the Lorentz-type spectrum and double-peaked probability distribution function for displacements.
- 東海大学の論文
著者
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SUDO Seiichi
Department of Mechanical Engineering, Iwaki Meisei University
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Otsuka Kenju
Department Of Human And Information Science
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Otsuka Kenju
Department Of Applied Physics School Of Engineering Tokai University
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Sudo Seiichi
Department Of Machine Intelligence And System Engineering Akita Prefectural University
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Sudo Seiichi
Department Of Physics
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MAKINO Hironori
Department of Applied Physics, Waseda University
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Makino Hironori
Department Of Human And Information Science
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Makino Hironori
Department Of Applied Physics Waseda University
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SANO Natsumi
Course of Applied Science
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MIYASAKA Yoshihiko
Course of Information Science and Engineering
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SUDO SEIICHI
Department of Chemical Engineering, University of Tokyo
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