High volume instrument measuring process
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An indirect measurement that is often used to infer both the fibre's maturity and fineness is micronaire, which is a measure of the cotton fibre's resistance to air flow per unit mass. Micronaire is often measured on high volume instruments, such as the Uster® High Volume Instrument (HVI) (USDA, 2001).
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The HVI systems measure trash or non-lint content by use of video camera to determine the amount of surface area of the sample that is covered with dark spots. As the camera scans the surface of the sample, the video output drops when a dark spot (presumed to be trash) is encountered.
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