Comparison of methods to derive infrared optical constants for organic materials for optical modeling

Kelly A. Peterson; Bruce E. Bernacki; Timothy J. Johnson; Tanya L. Myers

doi:10.1117/12.2663510

13 June 2023 Comparison of methods to derive infrared optical constants for organic materials for optical modeling

Kelly A. Peterson, Bruce E. Bernacki, Timothy J. Johnson, Tanya L. Myers

Proceedings Volume 12519, Algorithms, Technologies, and Applications for Multispectral and Hyperspectral Imaging XXIX ; 1251904 (2023) https://doi.org/10.1117/12.2663510
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Abstract

Reflectance spectroscopy, especially at infrared wavelengths, is often used for contact, standoff, and remote sensing of solid materials. The reflectance spectra of solids, however, are complex, relying on many factors, even for the same material. Such phenomena can be modeled if the optical constants as a function of wavelength or wavenumber, n(ν) and k(ν), are known. Methods to measure the optical constants of solids, however, are challenging, particularly for powdered materials. For powdered materials, a pressed pellet of the neat material is often used when a crystalline specimen is not available. In this work, three techniques, including ellipsometry, single-angle reflectance and KBr transmission spectroscopy, are applied to an organic material, acetaminophen, for comparison, and the effects on the modeled spectra are shown.

Conference Presentation

Citation Download Citation

Kelly A. Peterson, Bruce E. Bernacki, Timothy J. Johnson, and Tanya L. Myers "Comparison of methods to derive infrared optical constants for organic materials for optical modeling", Proc. SPIE 12519, Algorithms, Technologies, and Applications for Multispectral and Hyperspectral Imaging XXIX , 1251904 (13 June 2023); https://doi.org/10.1117/12.2663510

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