Color Space Transformation-Based Algorithm for Evaluation of Thermochromic Behavior of Cholesteric Liquid Crystals Using Polarized Light Microscopy
Color Space Transformation-Based Algorithm for Evaluation of Thermochromic Behavior of Cholesteric Liquid Crystals Using Polarized Light Microscopy
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基于色彩空间变换的算法,利用偏振光显微镜评估胆甾型液晶的热致变色行为
DOI:
10.1021/acsomega.9b03484
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发表时间:
2020
期刊:
影响因子:
4.1
通讯作者:
Swana, Kathleen W.
中科院分区:
文献类型:
--
作者:
Levit, Shani L.;Nguyen, Jimmy;Hattrup, Nicholas P.;Rabatin, Briget E.;Stwodah, Ratib;Vasey, Christopher L.;Zeevi, Michael P.;Gillard, McKenna;D’Angelo, Paola A.;Swana, Kathleen W.
Cholesteryl ester liquid crystals exhibit thermochromic properties related to the existence of a twisted nematic phase. When used in applications such as thermal mapping, a color change is often monitored by video cameras. Thus, quantitative methods to evaluate thermochromic behavior (e.g., blue-start, red-start, red-end, color play and bandwidth) from video analysis are desirable. However, obtaining quantitative color measurements from digital images remains a significant technical challenge, especially for highly reflective samples such as liquid crystals (for which ultraviolet–visible (UV–vis) reflectance spectroscopy is typically used). We developed a method to determine thermochromic properties from videos of liquid crystal cooling under polarized light microscopy. We relate observed color transitions to quantifiable changes in the cumulative color difference in the International Commission on Illumination (CIE)L*a*b* color space and validate this method with UV–vis reflectance spectroscopy. The measured thermochromic behavior and associated measurement uncertainties (coefficient of variations) were comparable to UV–vis reflectance measurements.
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DOI:
--
发表时间:
1972
期刊:
Journal of Pharmacy and Science
影响因子:
--
作者:
S. G. Frank;B. Byrd
通讯作者:
B. Byrd
DOI:
--
发表时间:
1992
期刊:
影响因子:
--
作者:
I. Sage
通讯作者:
I. Sage
DOI:
10.1021/j100863a018
发表时间:
1967
期刊:
The Journal of Physical Chemistry
影响因子:
--
作者:
E. Barrall;R. Porter;Julian F. Johnson
通讯作者:
Julian F. Johnson
影响因子:
4.1
作者:
Thornton, Breland T. E.;Harrison, Andrew;Tang, Christina
通讯作者:
Tang, Christina
影响因子:
--
作者:
V. M. Popov;A. S. Klimenko;A. P. Pokanevich;I. Gavrilyuk;N. Moshel
通讯作者:
N. Moshel