Bossa Nova Technologies, LLC

The Procter Gamble Company

Sebastien Breugnot

Nicolas Lechocinski

Bruno F Pouet

Bruno Fraçois Pouet

A method for measuring visual appearance of birefringent fibers is disclosed. The method involves emitting light, creating N polarization states of the emitted light, wherein the polarized emitted light illuminates the birefringent fibers, thereby generating internal reflection components, external reflection components, and diffusion components of the light, observing the light from the illuminated birefringent fibers, creating N polarization states of the observed light, forming N images of the observed polarized light, each image comprising a plurality of pixels, measuring the intensity in each pixel of the N images, and for each pixel, separating the internal reflection component, the external reflection component, and the diffusion component from the i-th image for the N images, wherein i=1, 2, . . . N and N&#x2267;4.

Visual appearance measurement method and system for randomly and regularly arranged birefringent fibers

Methods and apparatus to determine the orientation of randomly arranged birefringent fibers are disclosed. One method comprises emitting light, creating Npolarization states of the emitted light, illuminating the birefringent fibers with the emitted light so polarized, thereby generating IRinternal reflection components of the light in the birefringent fibers, observing the light from the illuminated birefringent fibers, creating Opolarization states of the observed light, forming Iimages of the observed polarized light, each image comprising an information (N, O, IR), wherein i=1, 2, . . . , n and n&#x2267;3, separating the i-th internal reflection component from the i-th image, and calculating an angle of a neutral axis of the birefringent fibers using the IRinternal reflection components.

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Los Angeles, CA, United States of America

Sebastien Breugnot