Optical and Quantum Electronics

, Volume 8, Issue 6, pp 523–529

Velocity measurement of a diffuse object by using time-varying speckles


  • Junji Ohtsubo
    • Research Institute of Applied ElectricityHokkaido University
  • Toshimitsu Asakura
    • Research Institute of Applied ElectricityHokkaido University

DOI: 10.1007/BF00620143

Cite this article as:
Ohtsubo, J. & Asakura, T. Opt Quant Electron (1976) 8: 523. doi:10.1007/BF00620143


The relation between the velocity of a moving diffuse object and the mean number of integrated speckles in the certain time interval at the far-field plane of the object is obtained. By using this relation based on the first order statistics of integrated speckles, a new method of measuring the velocity of the diffuse object is proposed and experimentally verified. The first order probability density function of time-integrated speckles is also studied from which the validity of the present method is verified.

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© Chapman and Hall Ltd. 1976