Broadband Dielectric Spectroscopy: Recent Developments in Microwave Time-Domain Techniques

Entesari, Kamran; Ghiri, Reza Ebrahimi; Kaya, Elif

doi:10.1109/mmm.2021.3064100

Cited by 8 publications

(5 citation statements)

References 52 publications

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“…The response of a material to an electromagnetic field operating in the MW regime can be interpreted in terms of the complex permittivity [24], [25], [26]…”

Section: B Ds Measurementsmentioning

confidence: 99%

Effects of Carasau Dough Composition on the Microwave Dielectric Spectra up to 20 GHz

Lodi

Macciò

Curreli

et al. 2023

IEEE Trans. Agri. Elect.

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Carasau bread is a traditional product from Sardinia (IT). This flat bread is experiencing industrial advancement, through automation, and has great market potential. However, there is lack of understanding of how the composition (water content, salt, and yeast concentration) affects the product quality. In this work, a microwave dielectric spectroscopy study is performed to investigate how the composition of Carasau bread doughs influences the spectra of this food product up to 20 GHz. A third-order Cole-Cole model was used for the physical and quantitative understanding of the electromagnetic properties of this food product. Then, it has been studied how salt, yeast, and water variations affected the model parameters. This work could pave the route to the development of non-destructive, contactless microwave sensors for Carasau bread quality assessment.

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“…The response of a material to an electromagnetic field operating in the MW regime can be interpreted in terms of the complex permittivity [24], [25], [26]…”

Section: B Ds Measurementsmentioning

confidence: 99%

Effects of Carasau Dough Composition on the Microwave Dielectric Spectra up to 20 GHz

Lodi

Macciò

Curreli

et al. 2023

IEEE Trans. Agri. Elect.

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“…The signal scattering from the electrical interfaces is summarized as a matrix of S-parameters that quantifies how RF energy propagates through a multiport network such as a vector network analyzer (VNA). The S-parameters can be extracted in the frequency domain (FD), time domain (TD), or hybrid modes based on the form of the interrogating signal [31]. In this work, we used a two-port hybrid technique, in which the input excitation is convolved with the transfer function of the sensor (h(f)) loaded with the MUT.…”

Section: Broadband Dielectric Spectroscopy (Bds) Backgroundmentioning

confidence: 99%

“…When microwaves interact with the analyte (i.e., MUT) the incident microwave signal scatters according to the material's permittivity; the signal scattering is a function of frequency and experimental stress (i.e., F[h(f)]). The input excitation is convoluted by the transfer function of the sensor loaded with the MUT, i.e., (h(f)), to generate the output S-parameter [31]. In this paper, using BDS metrology, we compare ethanol vapor sensing on ZnO nanorods and surface-anchored metal-organic-framework thin films (HKUST-1 SURMOF) as sensing materials at temperatures under 100 °C.…”

Section: Broadband Dielectric Spectroscopy (Bds) Backgroundmentioning

confidence: 99%

Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media

et al. 2022

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The most common gas sensors are based on chemically induced changes in electrical resistivity and necessarily involve making imperfect electrical contacts to the sensing materials, which introduce errors into the measurements. We leverage thermal- and chemical-induced changes in microwave propagation characteristics (i.e., S-parameters) to compare ZnO and surface-anchored metal–organic-framework (HKUST-1 MOF) thin films as sensing materials for detecting ethanol vapor, a typical volatile organic compound (VOC), at low temperatures. We show that the microwave propagation technique can detect ethanol at relatively low temperatures (<100 °C), and afford new mechanistic insights that are inaccessible with the traditional dc-resistance-based measurements. In addition, the metrological technique avoids the inimical measurand distortions due to parasitic electrical effects inherent in the conductometric volatile organic compound detection.

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“…These parameters capture how RF energy travels through a multiport network, such as using a vector network analyzer (VNA), with the analyte between the source and receiver. Thus, the output of the S-parameters is convoluted with the transfer function of the sensor loaded with the MUT, i.e., (h(f)) [23]; thus, the S-parameters can be deconvoluted to produce the circuit elements characteristic of the analyte [24].…”

Section: Broadband Dielectric Spectroscopy (Bds) Backgroundmentioning

confidence: 99%

Broadband Dielectric Spectroscopic Detection of Aliphatic Alcohol Vapors with Surface-Mounted HKUST-1 MOFs as Sensing Media

et al. 2022

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We leveraged chemical-induced changes to microwave signal propagation characteristics (i.e., S-parameters) to characterize the detection of aliphatic alcohol (methanol, ethanol, and 2-propanol) vapors using TCNQ-doped HKUST-1 metal-organic-framework films as the sensing material, at temperatures under 100 °C. We show that the sensitivity of aliphatic alcohol detection depends on the oxidation potential of the analyte, and the impedance of the detection setup depends on the analyte-loading of the sensing medium. The microwaves-based detection technique can also afford new mechanistic insights into VOC detection, with surface-anchored metal-organic frameworks (SURMOFs), which is inaccessible with the traditional coulometric (i.e., resistance-based) measurements.

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Broadband Dielectric Spectroscopy: Recent Developments in Microwave Time-Domain Techniques

Cited by 8 publications

References 52 publications

Effects of Carasau Dough Composition on the Microwave Dielectric Spectra up to 20 GHz

Effects of Carasau Dough Composition on the Microwave Dielectric Spectra up to 20 GHz

Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media

Broadband Dielectric Spectroscopic Detection of Aliphatic Alcohol Vapors with Surface-Mounted HKUST-1 MOFs as Sensing Media

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