A non-contact microwave sensor for monitoring the interaction of zeolite 13X with CO2 and CH4 in gaseous streams

Zarifi, Mohammad H.; Shariaty, Pooya; Hashisho, Zaher; Daneshmand, Mojgan

doi:10.1016/j.snb.2016.09.047

Cited by 63 publications

(26 citation statements)

References 43 publications

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“…Thus, increasing the permittivity of zeolite can be achieved by adsorbed polar gas. Several studies have observed this performance (Zarifi et al, 2017). The evolution of gas adsorption in zeolite and the permittivity change are shown in Figure 5.…”

Section: Zeolitesmentioning

confidence: 72%

“…A planar propagative structure was also applied in non-contact mode for monitoring of the adsorbent; the adsorbent in the gas tube was above the planar microstrip line, which is shown in Figure 11. The permittivity change of adsorbent influenced the electromagnetic waves propagated in the microstrip line (Reiß et al, 2011;Zarifi et al, 2015aZarifi et al, , 2017. This contactless technique is attractive for dangerous and toxic gas detection as the sensing platform does not need to be in the gas-flowing medium.…”

Section: Propagative Structuresmentioning

confidence: 99%

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Gas Sensing by Microwave Transduction: Review of Progress and Challenges

Zheng

Hua

et al. 2019

Front. Mater.

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Microwave transduction is a novel research field in gas sensing owing to its simplicity, low cost, passive, and non-contact operations that indicate a huge potential in applications for gas sensing. At present, the study of microwave gas sensors is limited to testing the macroscopic performance of materials. Although the permittivity change of materials is the reason for microwave transduction, the knowledge of the fundamental mechanism is an urgent requirement for boosting the development of microwave gas sensors. In this review, we summarized the presented progresses of microwave gas sensors, including the performance of the different materials and propagative structures, as well as their sensitive signal. We have attempted to explain the sensitive mechanism of these materials, discuss the function of the propagative structure, and analyze the sensitive signal extracted from the parameters of electromagnetic waves. Finally, the challenges in the study of sensitive materials and propagative structures used in microwave gas sensors are analyzed. It is clear from the published literatures that microwave transduction provide a new route for gas detection, and it is expected that commercial manifestation will occur. The future research on microwave gas sensors will continue to exploit their sensitive materials and propagative structure for different applications. The understanding of the microscopic polarization interactions with gases will assist in and guide the fabrication of high-performance microwave gas sensors in the future.

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Section: Zeolitesmentioning

confidence: 72%

Section: Propagative Structuresmentioning

confidence: 99%

Gas Sensing by Microwave Transduction: Review of Progress and Challenges

Zheng

Hua

et al. 2019

Front. Mater.

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“…In contrast to Zarifi et al [9], who recently suggested a similar idea, no active feedback loop could be used, since it is intended to heat the sensor to several hundred °C. The resonator was initially designed for transmission and reflection measurement (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

“…They have been attracting research interest in recent years [9][10][11][12]. They are even applied in automotive exhausts to monitor directly the status of zeolite-based SCR catalysts [13,14].…”

Section: Introductionmentioning

confidence: 99%

Planar Microstrip Ring Resonator Structure for Gas Sensing and Humidity Sensing Purposes

Bogner

Steiner

Walter

et al. 2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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“…Microwave sensor can be used for determining the dielectric characterization of materials, and this characteristic makes it very useful in agricultural, industrial, scientific, and biomedical applications . According to the Debye theory, the dielectric parameter of material is dependent on the working frequency .…”

Section: Introductionmentioning

confidence: 99%

Symmetric coplanar waveguide sensor loaded with interdigital capacitor for permittivity characterization

Sun

Guo

et al. 2019

Int J RF Microw Comput Aided Eng

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This article presents the developing of interdigital capacitor (IDC) based symmetric coplanar waveguide (CPW) sensor to characterize the complex permittivity of unknown dielectric sheets. The symmetric structure is realized by using two identical 3 dB CPW dividers where each branch is loaded with an IDC unit. The proposed method is designed using three, five, and seven fingers of the IDC unit, and the measurement sensitivity is analyzed accordingly. The permittivity of tested samples is extracted by the genetic algorithm. To validate the robust sensing performance of the proposed method, simulation and experimental tests are performed and analyzed, and the accuracy is compared with published values. The proposed method gives the maximum error of 3.42%. With the feature of high-sensitivity, the proposed sensor can be used as an excellent candidate for determining the permittivity of materials in microwave frequencies.K E Y W O R D S coplanar waveguide, high sensitivity, interdigital capacitor, permittivity extraction, symmetric sensor

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A non-contact microwave sensor for monitoring the interaction of zeolite 13X with CO2 and CH4 in gaseous streams

Cited by 63 publications

References 43 publications

Gas Sensing by Microwave Transduction: Review of Progress and Challenges

Gas Sensing by Microwave Transduction: Review of Progress and Challenges

Planar Microstrip Ring Resonator Structure for Gas Sensing and Humidity Sensing Purposes

Symmetric coplanar waveguide sensor loaded with interdigital capacitor for permittivity characterization

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