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Increased Absorption-Measurement Accuracy Through Windowing of Photon-Transit Times to Account for Scattering in Continuous Webs and Powders
Increased Absorption-Measurement Accuracy Through Windowing of Photon-Transit Times to Account for Scattering in Continuous Webs and Powders
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机译:通过增加光子传输时间窗口来解决连续卷筒纸和粉末中的散射问题,从而提高了吸收测量的准确性
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摘要
Radiation scattering is one of the main contributors to the uncertainty of near infrared (NIR) measurements. Enhanced absorption-measurement accuracy for NIR sensors is achieved by using a combination of NIR spectroscopy and time-of-flight techniques to select photons that are the result of a given mean free path within a moving sample target. By measuring absorption as a function of path length or by windowing signals that are attributable to excessive scattering of NIR radiation within the sample, this technique affords the calculation of more accurate and more universal calibrations. The NIR sensor employs short or ultra-short laser pulses to create NIR that is directed to the moving sample and emerging radiation is detected over time. Windowing effectively truncates non-contributing measurements.
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