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Dynamic Properties of Laser Speckles on Images Transmitted Through an Image Fibre-bundle |
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| Authors: | Nobukatsu Takai Shunpei Kimura Toshimitsu Asakura |
| Affiliation: | 1. Research Institute of Applied Electricity , Hokkaido University , Sapporo, Hokkaido, 060, Japan;2. Department of Electronics and Information Engineering , Faculty of Engineering, Hokkai-Gakuen University , Sapporo, Hokkaido, 064, Japan;3. Research Institute of Applied Electricity , Hokkaido University , Sapporo, Hokkaido, 060, Japan |
| Abstract: | Abstract The statistical properties of time-varying laser speckles appearing on an image transmitted through an image fibre-bundle are studied experimentally and theoretically. The effect of defocusing on a stage of observation is investigated in relation to the stationarity of the detected speckle intensity. It is shown that a large amount of defocusing produces a stationary speckle field for which the correlation function of the speckle intensity variation is obtained in a stable form. This allows a system for monitoring the velocity of moving objects using an image fibre-bundle to be developed. |
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