抄録
When a rough surface is irradiated by a laser light and a reflected light or a transmitted light is observed, a diffraction fringe with speckle is obtained at the observation plane. This diffraction fringe is called the speckle pattern.
In the present study, the static states of woven fabric surfaces were obtained as the autocorrelation functions from the speckle patterns.
The functions indicate the following facts.
(1) By the reflection method, the surface configuration of a woven fabric can be known, on the other hand, by the transmission method, the state of plane arrangement of yarn can be known.
(2) Three fundamental weaves, i.e. plane weave, twill weave, and satin weave, can be discriminated.
(3) The presence of periodic defect in the woven fabric and its size can be detected.
