Refractive index measurement of pharmaceutical powders in the short-wave infrared range using index matching assisted with phase imaging

Refractive index is a fundamental optical property of powder and a key input to the measurement of the size distribution using light scattering and the measurement of the absorption and scattering coefficients using diffuse reflectance spectroscopy. In this work, we demonstrate a method that combine...

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Published in:arXiv.org 2024-03
Main Authors: Juntunen, Cory, Rish, Adam J, Anderson, Carl, Sung, Yongjin
Format: Article
Language:English
Subjects:
Imaging
Optical properties
Pharmaceuticals
Phase matching
Refractivity
Scattering coefficient
Short wave radiation
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Rish, Adam J
Anderson, Carl
Sung, Yongjin
description Refractive index is a fundamental optical property of powder and a key input to the measurement of the size distribution using light scattering and the measurement of the absorption and scattering coefficients using diffuse reflectance spectroscopy. In this work, we demonstrate a method that combines index matching with phase imaging to determine the refractive index of complex powder particles at high accuracy without relying on any assumptions. Index matching is robust, but the accuracy is not high by relying on ocular observation of the interface. Phase imaging using interferometry improves the accuracy of determining the match by an order of magnitude. Using the proposed method, we determine the refractive index of four types of pharmaceutical powder in the short-wave infrared range of 1100-1650 nm.
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subjects Imaging
Optical properties
Pharmaceuticals
Phase matching
Refractivity
Scattering coefficient
Short wave radiation
title Refractive index measurement of pharmaceutical powders in the short-wave infrared range using index matching assisted with phase imaging
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