The parasitic effects in high-frequency dielectric spectroscopy of liquid crystals – the review
The parasitic effects in high-frequency dielectric spectroscopy of liquid crystals – the review
复制标题
液晶高频介电谱中的寄生效应——综述
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
P. Perkowski
中科院分区：
文献类型：
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作者：
P. Perkowski
摘要液晶的介电(阻抗)谱是一种强有力的实验技术。这是特别重要的，因为在许多应用中，液晶仍然受电场控制。本文讨论了经典(扁平电容器形状)测量单元高频(1 MHz)测量存在的问题。提出了克服测量困难的方法，并将其应用于反铁电二元混合物的介电响应。此外，本文还介绍了通过克服测量装置中与共振有关的寄生效应，将介电频谱的测量范围从1 MHz扩展到~50 MHz的第一个例子。图形摘要
ABSTRACT Dielectric (impedance) spectroscopy of liquid crystals is a powerful experimental technique. It is especially essential because liquid crystals in many applications are still controlled by the electric field. In this paper, the problems with the high frequency (>1 MHz) measurements in classical (in the shape of the flat capacitor) measuring cells are discussed. The procedure for overcoming measurement difficulties was presented and applied to the dielectric response of antiferroelectric, binary mixture. Additionally, the paper presents the first example of extending the measuring range of dielectric spectroscopy from 1 MHz to ~50 MHz by overcoming the parasitic effect related to resonance in measuring setup. Graphical abstract