title: Surface-roughness measurement using Fourier transformation of doubly scattered speckle pattern.
abstract: The statistical properties of the doubly scattered speckle pattern generated from a rough surface, under a fully developed and static speckle pattern illumination, have been investigated by numerical analysis. The real-time Fourier transformation of the doubly scattered speckle pattern by an optical process enables us to measure the surface roughness in quasi real time.
authors.forename: K
authors.initials: K
authors.lastname: Nakagawa
authors.forename: T
authors.initials: T
authors.lastname: Yoshimura
authors.forename: T
authors.initials: T
authors.lastname: Minemoto