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.
Swana, Kathleen W.
中科院分区:
化学3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.

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胆甾醇酯液晶显示出与扭曲液晶相的存在有关的热致变色性质。当用于热成像等应用时,颜色变化通常由摄像机监控。因此,评价热致变色行为的定量方法(例如,蓝开始、红开始、红结束、彩色播放和带宽)。然而,从数字图像获得定量颜色测量仍然是一个重大的技术挑战,特别是对于高反射样品,如液晶(紫外可见光(UV-vis)反射光谱通常用于)。我们开发了一种方法来确定热致变色性能的液晶冷却偏光显微镜下的视频。我们将观察到的颜色转变与国际照明委员会(CIE)L*a*B* 颜色空间中累积色差的可量化变化相关联,并使用紫外-可见反射光谱法验证该方法。测得的热致变色行为和相关的测量不确定性(变异系数)的紫外-可见光反射率测量。
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.
胆固醇酯二元混合物中的相变。
DOI: --
发表时间: 1972
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