A hollow coaxial cable Fabry–Pérot resonator for liquid dielectric constant measurement

2018 ◽  
Vol 89 (4) ◽  
pp. 045003 ◽  
Author(s):  
Chen Zhu ◽  
Yiyang Zhuang ◽  
Yizheng Chen ◽  
Jie Huang
Keyword(s):  
Dielectric Constant ◽  
Liquid Dielectric ◽  
Coaxial Cable ◽  
Fabry Perot ◽  
Constant Measurement ◽  
Dielectric Constant Measurement

Dielectric Constant Measurement of Liquids Using Nanosecond-Pulsed Signals

2011 ◽  
Vol 483 ◽  
pp. 755-759 ◽  
Author(s):  
Wei Qiang Sun ◽  
Yong Yang ◽  
Sheng Yong Xu
Keyword(s):  
Dielectric Constant ◽  
Quantitative Estimation ◽  
Maximum Error ◽  
Coaxial Cable ◽  
Test Device ◽  
Constant Measurement ◽  
Dielectric Constant Measurement ◽  
Novel Method

In this paper, we report a novel method to measure the dielectric constant of various liquids of limited amount. The liquid under test is sealed in a coaxial-like test device. The dielectric constant is determined by comparing the delay of a nanosecond-pulsed signal traveling through the test device with that traveling through a reference coaxial cable. The results show that the maximum error of this kind of measurement is within 15-30%, which is good enough for a semi-quantitative estimation of the dielectric constant of an unknown liquid, especially when the amount of the liquid is not enough for investigation with other existing approaches.

scholarly journals Design of a High Sensitivity Microwave Sensor for Liquid Dielectric Constant Measurement

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5598
Author(s):  
Honggang Hao ◽  
Dexu Wang ◽  
Zhu Wang ◽  
Bo Yin ◽  
Wei Ruan
Keyword(s):  
Dielectric Constant ◽  
Resonant Frequency ◽  
High Sensitivity ◽  
Dielectric Substrate ◽  
Frequency Offset ◽  
Liquid Dielectric ◽  
Microwave Sensor ◽  
Constant Measurement ◽  
Dielectric Constant Measurement ◽  
First Time

In order to improve the sensitivity of liquid dielectric constant measurements, a liquid dielectric constant sensor based on a cubic container structure is proposed for the first time. The cubic container, which consists of a dielectric substrate with a split resonant ring (SRR) and microstrip lines, can enhance the electric field intensity in the measuring area. High sensitivity can be obtained from measuring the dielectric constant with the characteristics of the structure resonate. The research results show that the resonant frequency of the sensor is shifted from 7.69 GHz to 5.70 GHz, with about a 2 GHz frequency offset, when the dielectric constant of the sample varied from 1 to 10. A resonance frequency offset of 200 MHz for the per unit dielectric constant is achieved, which is excellent regarding performance. The permittivity of oil with a different metal content is measured by using the relation between the fitted permittivity and the resonant frequency. The relative error is less than 1.5% and the sensitivity of measuring is up to 3.45%.

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