A Radio Frequency Sensor For Measurement Of Small Dielectric Property Changes

Liu, W.-N.; Yue, Yang

doi:10.1080/09205071.2012.710566

Cited by 10 publications

(4 citation statements)

References 20 publications

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“…Dielectric spectroscopy that measures dielectric properties operates in real-time, is on-line 24 h a day, is label-free, is easy to integrate with other microwave circuit, and yields high-volume production [ 9 ]. Therefore, there are different methods of the complex permittivity determination of dielectric materials, including transmission-only, reflection-only, transmission-reflection, and resonant cavity methods [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

A Microwave Method for Dielectric Characterization Measurement of Small Liquids Using a Metamaterial-Based Sensor

Liu

Sun

2018

Sensors

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We present a microwave method for the dielectric characterization of small liquids based on a metamaterial-based sensor The proposed sensor consists of a micro-strip line and a double split-ring resonator (SRR). A large electric field is observed on the two splits of the double SRRs at the resonance frequency (1.9 GHz). The dielectric property data of the samples under test (SUTs) were obtained with two measurements. One is with the sensor loaded with the reference liquid (REF) and the other is with the sensor loaded with the SUTs. Additionally, the principle of extracting permittivity from measured changes of resonance characteristics changes of the sensor loaded with REF and SUTs is given. Some measurements were carried out at 1.9 GHz, and the calculated results of methanol–water mixtures with different molar fractions agree well with the time-domain reflectometry method. Moreover, the proposed sensor is compact and highly sensitive for use of sub-wavelength resonance. In comparison with literature data, relative errors are less than 3% for the real parts and 2% for the imaginary parts of complex permittivity.

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Section: Introductionmentioning

confidence: 99%

A Microwave Method for Dielectric Characterization Measurement of Small Liquids Using a Metamaterial-Based Sensor

Liu

Sun

2018

Sensors

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“…Based on coplanar waveguide structure, an ultra-sensitive radio frequency sensor was proposed to measure yeast cells in [10]. And after further improvement, the transmission coefficient S 21 reached -70 dB by calibration with deionized water in [11]. Then this sensor was used to measure the molarity of primary alcohol and the lowest limit is 0.25%.…”

Section: Introductionmentioning

confidence: 99%

An Ultra-Sensitivity Cancellation Type Sensor Based on Microstrip Meander-Line

Liu

Huan

Zhu

et al. 2021

2021 IEEE 3rd International Conference on Circuits and Systems (ICCS)

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The analysis of dielectric properties in Novel Coronavirus has become an important research branch since the outbreak of the epidemic in 2019. In order to detect the dielectric properties of microfluidics like virus with higher sensitivity, a radio frequency sensor model is proposed in this paper. First, based on the excellent characteristics of the microstrip meander-line such as more concentrated electric field distribution, the microstrip meander-line is introduced into the design of traditional cancellation sensor, which is called the meander sensor. Then, the relationship between transmission coefficients of the system and dielectric properties of microfluidics is given in this paper. The simulation results verify the ultrasensitivity of the meander sensor. Even though the relative permittivity of microfluidics is changed in the order of magnitude 10 -2 , the measurement results of the meander sensor also change significantly. However, the straight sensor can only measure changes of relative permittivity in the order of magnitude 10 -1 . What's more, there is a more concentrated measurement range for the meander sensor. This will be more practical for measuring weak changes of dielectric properties caused by the microfluidics itself and its interactions.

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“…Currently, the industry uses offline characterization methods, such as drying, selective chemical or routine methods, and so forth which are not suitable for a 24/7 running industry. 5 RF/microwave sensors used to measure dielectric properties of the materials 6 have features of real-time operability, label-free technology, and easy to integrate with other microwave circuits, and yields a valuable information that can be monitored using ADC converter and LCD. There are different techniques used to determine the dielectric properties of materials, such as parallel plates, 7,8 coaxial probes, [9][10][11][12][13] transmission lines, [14][15][16][17][18][19] and resonant cavities.…”

Section: Introductionmentioning

confidence: 99%

Real‐time low cost compact liquid‐water binary mixture monitoring sensor

Khuhro

Sandhu

Afridi

et al. 2020

Micro & Optical Tech Letters

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This work proposes a novel method for detecting the concentration of water present in liquid‐water binary mixture in real time with a low cost, portable measurement setup. The sensing element in the proposed system is a two‐port microstrip bandstop resonator based on coupled line open‐ended quarter wavelength section. Voltage control oscillator and power detector ICs are used to generate and detect the microwave power at specific bandstop frequency. Water concentrations in commercially available liquids are monitored both in batch and continuous mode of operation using separate 3D printed liquid containing fixtures attached to the open end of the microstrip line. The measured results successfully validate the design theory.

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A Radio Frequency Sensor For Measurement Of Small Dielectric Property Changes

Cited by 10 publications

References 20 publications

A Microwave Method for Dielectric Characterization Measurement of Small Liquids Using a Metamaterial-Based Sensor

A Microwave Method for Dielectric Characterization Measurement of Small Liquids Using a Metamaterial-Based Sensor

An Ultra-Sensitivity Cancellation Type Sensor Based on Microstrip Meander-Line

Real‐time low cost compact liquid‐water binary mixture monitoring sensor

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