- Conference date: 21–26 October 2007
- Location: Campinas, São Paulo (Brazil)
We propose a new method to measure the cover factor (CF) of a translucent textile web through the measure of its reflectance with a spectroradiometer. CF is the ratio of the area covered by the yarns to the whole area of the fabric. Reflectance of a single layer of a web, over a background is modelled as a weighted mean of the reflectance of the fabric threads, and the reflectance of the background, Its corresponding weights are CF and 1–CF. can be straightforwardly measured by the spectroradiometer. Fabric's threads reflectance is derived by Kubelka‐Munk's theory from the reflectances of a sequence of an increasing superposition of fabric layers, assuming that a suitable superposition of several enough layers of fabric can be considered as a homogeneous medium with completely diffuse light distribution. The sequence extends up to a number of layers enough that the reflectance stabilizes. Linear regression furnishes CF from and The method has been applied to a variety of coloured translucent samples with different CF values, which have been previously evaluated by image thresholding. CF values obtained from reflectances show a good agreement with the previously known CF values of the analyzed samples.
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