NDLI: Calibration-independent measurement of complex permittivity of liquids using a coaxial transmission line.

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Calibration-independent measurement of complex permittivity of liquids using a coaxial transmission line.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Guoxin, Cheng
Description	Author Affiliation: Guoxin C ( College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, People's Republic of China.)
Abstract	In recent years, several calibration-independent transmission/reflection methods have been developed to determine the complex permittivity of liquid materials. However, these methods experience their own respective defects, such as the requirement of multi measurement cells, or the presence of air gap effect. To eliminate these drawbacks, a fast calibration-independent method is proposed in this paper. There are two main advantages of the present method over those in the literature. First, only one measurement cell is required. The cell is measured when it is empty and when it is filled with liquid. This avoids the air gap effect in the approach, in which the structure with two reference ports connected with each other is needed to be measured. Second, it eliminates the effects of uncalibrated coaxial cables, adaptors, and plug sections; systematic errors caused by the experimental setup are avoided by the wave cascading matrix manipulations. Using this method, three dielectric reference liquids, i.e., ethanol, ethanediol, and pure water, and low-loss transformer oil are measured over a wide frequency range to validate the proposed method. Their accuracy is assessed by comparing the results with those obtained from the other well known techniques. It is demonstrated that this proposed method can be used as a robust approach for fast complex permittivity determination of liquid materials.
ISSN	00346748
Issue Number	1
Journal	Review of Scientific Instruments
Volume Number	86
e-ISSN	10897623
Language	English
Publisher	American Institute of Physics
Publisher Date	2015-01-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Physics Discipline Chemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Instrumentation

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