Detection of methanol contamination in ethyl alcohol employing a purpose-designed high-sensitivity microwave sensor

Measurement ◽  
2021 ◽  
Vol 174 ◽  
pp. 108993
Author(s):  
Ilona Piekarz ◽  
Krzysztof Wincza ◽  
Slawomir Gruszczynski ◽  
Jakub Sorocki
Keyword(s):  
Ethyl Alcohol ◽  
High Sensitivity ◽  
Microwave Sensor

scholarly journals Complex Permittivity Characterization of Liquid Samples Based on a Split Ring Resonator (SRR)

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3385
Author(s):  
Jialu Ma ◽  
Jingchao Tang ◽  
Kaicheng Wang ◽  
Lianghao Guo ◽  
Yubin Gong ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Complex Permittivity ◽  
Ring Resonator ◽  
High Sensitivity ◽  
Split Ring Resonator ◽  
Debye Model ◽  
Split Ring ◽  
Liquid Samples ◽  
Microwave Sensor

A complex permittivity characterization method for liquid samples has been proposed. The measurement is carried out based on a self-designed microwave sensor with a split ring resonator (SRR), the unload resonant frequency of which is 5.05 GHz. The liquid samples in capillary are placed in the resonant zone of the fabricated senor for high sensitivity measurement. The frequency shift of 58.7 MHz is achieved when the capillary is filled with ethanol, corresponding a sensitivity of 97.46 MHz/μL. The complex permittivity of methanol, ethanol, isopropanol (IPA) and deionized water at the resonant frequency are measured and calibrated by the first order Debye model. Then, the complex permittivity of different concentrations of aqueous solutions of these materials are measured by using the calibrated sensor system. The results show that the proposed sensor has high sensitivity and accuracy in measuring the complex permittivity of liquid samples with volumes as small as 0.13 μL. It provides a useful reference for the complex permittivity characterization of small amount of liquid chemical samples. In addition, the characterization of an important biological sample (inositol) is carried out by using the proposed sensor.

High-Sensitivity Accurate Characterization of Complex Permittivity Using Inter-digital Capacitor-Based Planar Microwave Sensor

2021 ◽  
Author(s):  
Luqman Ali ◽  
Cong Wang ◽  
Fan-Yi Meng ◽  
Kishor Kumar Adhikari ◽  
Yu-Chen Wei ◽  
...  
Keyword(s):  
Complex Permittivity ◽  
High Sensitivity ◽  
Microwave Sensor

Compensating on-chip transmission line losses for a high-sensitivity microwave sensor

2009 ◽  
Vol 154 (1) ◽  
pp. 7-11 ◽  
Author(s):  
Chunrong Song ◽  
James E. Harriss ◽  
Pingshan Wang
Keyword(s):  
Transmission Line ◽  
High Sensitivity ◽  
Microwave Sensor ◽  
On Chip

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%.

scholarly journals Extremely Sensitive Microwave Sensor for Evaluation of Dielectric Characteristics of Low-Permittivity Materials

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1916 ◽  
Author(s):  
Tanveerul Haq ◽  
Cunjun Ruan ◽  
Xingyun Zhang ◽  
Shahid Ullah ◽  
Ayesha Kosar Fahad ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Relative Permittivity ◽  
Magnetic Loss ◽  
High Sensitivity ◽  
Transcendental Equation ◽  
Differential Sensitivity ◽  
Percentage Error ◽  
Dielectric Characteristics ◽  
Microwave Sensor ◽  
Low Permittivity

In this paper, an extremely sensitive microwave sensor is designed based on a complementary symmetric S shaped resonator (CSSSR) to evaluate dielectric characteristics of low-permittivity material. CSSSR is an artificial structure with strong and enhanced electromagnetic fields, which provides high sensitivity and a new degree of freedom in sensing. Electromagnetic simulation elucidates the effect of real relative permittivity, real relative permeability, dielectric and magnetic loss tangents of the material under test (MUT) on the resonance frequency and notch depth of the sensor. Experiments are performed at room temperature using low-permittivity materials to verify the concept. The proposed design provides differential sensitivity between 102% to 95% as the relative permittivity of MUT varies from 2.1 to 3. The percentage error between simulated and measured results is less than 0.5%. The transcendental equation has been established by measuring the change in the resonance frequency of the fabricated sensor due to interaction with the MUT.

scholarly journals High-Sensitivity Microwave Sensor Based on An Interdigital-Capacitor-Shaped Defected Ground Structure for Permittivity Characterization

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 498 ◽  
Author(s):  
Junho Yeo ◽  
Jong-Ig Lee
Keyword(s):  
High Sensitivity ◽  
Dielectric Constants ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Ridge Structure ◽  
Dielectric Characterization ◽  
Interdigital Capacitor ◽  
Double Ring ◽  
Microwave Sensor ◽  
Single Ring

This study proposes a high-sensitivity microwave sensor based on an interdigital-capacitor-shaped defected ground structure (IDCS-DGS) in a microstrip transmission line for the dielectric characterization of planar materials. The proposed IDCS-DGS was designed by modifying the straight ridge structure of an H-shaped aperture. The proposed sensor was compared with conventional sensors based on a double-ring complementary split ring resonator (CSRR), a single-ring CSRR, and a rotated single-ring CSRR. All the sensors were designed and fabricated on 0.76-mm-thick RF-35 substrate and operated at 1.5 GHz under unloaded conditions. Five different standard dielectric samples with dielectric constants ranging from 2.17 to 10.2 were tested for the sensitivity comparison. The sensitivity of the proposed sensor was measured by the shift in the resonant frequency of the transmission coefficient, and compared with conventional sensors. The experiment results show that the sensitivity of the proposed sensor was two times higher for a low permittivity of 2.17 and it was 1.42 times higher for a high permittivity of 10.2 when compared with the double-ring CSRR-based sensor.

High-Q Active Microwave Sensor Based on Microstrip Complementary Split-Ring Resonator (MCSRR) Structure for Dielectric Characterization

2021 ◽  
Vol 36 (7) ◽  
pp. 922-927
Author(s):  
Hong-Yi Gan ◽  
Wen-Sheng Zhao ◽  
Da-Wei Wang ◽  
Jing Wang ◽  
Qi Liu ◽  
...  
Keyword(s):  
Quality Factor ◽  
Ring Resonator ◽  
High Sensitivity ◽  
Dielectric Materials ◽  
Negative Resistance ◽  
Split Ring Resonator ◽  
Split Ring ◽  
Dielectric Characterization ◽  
Complementary Split Ring Resonator ◽  
Microwave Sensor

This paper presents an active microwave sensor for the characterization of dielectric materials. The sensor is consisted of a microstrip complementary split-ring resonator (MCSRR) structure and an active feedback loop. The loop uses an amplifier to generate negative resistance to compensate the resonator’s loss and increase the loaded quality factor. The developed sensor possesses the advantages of high quality factor, ultra-small electrical size, and high sensitivity. A prototype of the sensor is fabricated and measured for validation.

Sign in / Sign up

Export Citation Format

Share Document