Microwave microfluidic sensor for determination of glucose concentration in water

Ebrahimi, Amir; Withayachumnankul, Withawat; Al-Sarawi, Said F.; Abbott, Derek

doi:10.1109/mms.2015.7375441

Cited by 87 publications

(33 citation statements)

References 15 publications

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“…In recent years, metamaterials-based resonators have found numerous applications in sensing and measurements. RF and microwave sensors are popular in various measurement and instrumentation applications due to their robust, real-time, and label free measurement compatibilities [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The measurement principle in a majority of microwave sensors is the frequency shift or notch magnitude variation, where any environmental or structural alterations leads to modification of the resonance characteristics [21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Microwave Differential Frequency Splitting Sensor Using Magnetic-LC Resonators

Ebrahimi

Beziuk

Scott

et al. 2020

Sensors

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A differential microwave permittivity sensor and comparator is designed using a microstrip transmission line loaded with a magnetic-LC resonator. The microstrip transmission line is aligned with the electric wall of the resonator. The sensor shows a single transmission zero, when it is unloaded or loaded symmetrically on both halves. A second notch appears in the transmission response by asymmetrical dielectric loading on the two halves of the device. The frequency splitting is used to characterize the dielectric properties of the samples under test. The sensitivity of the sensor is enhanced by removing the mutual coupling between the two halves of the magnetic-LC resonator using a metallic wall. The sensors’ operation principle is explained through a circuit model analysis. A prototype of the designed sensor is fabricated and measurements are used for validation of the sensing concept. The sensor can be used for determination of the dielectric properties in solid materials or detecting defects and impurities in solid materials through a comparative measurement with a reference sample.

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Section: Introductionmentioning

confidence: 99%

Microwave Differential Frequency Splitting Sensor Using Magnetic-LC Resonators

Ebrahimi

Beziuk

Scott

et al. 2020

Sensors

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“…Concerning sensors, the subject of interest in this work, several strategies or principles have been reported for sensing in resonator-loaded lines, including variation of the notch frequency (or frequencies) [15], [17]- [25], frequency splitting [26]- [28], or modulation of the notch magnitude [16], [29]- [37]. Many different variables can be measured through the aforementioned sensing principles, but these sensors implemented through transmission lines with metamaterial loading are especially useful for measuring spatial variables, such as linear or angular displacement and velocities.…”

mentioning

confidence: 99%

Application of Split Ring Resonator (SRR) Loaded Transmission Lines to the Design of Angular Displacement and Velocity Sensors for Space Applications

Mata-Contreras

Herrojo

Martín

2017

IEEE Trans. Microwave Theory Techn.

146

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The accurate measurement of the angular displacement and velocity of reaction wheels is necessary for attitude (orientation) control in space vehicles (satellites). In this paper, microwave, contactless and low cost (as compared to optical encoders) sensors useful for that purpose are analyzed in detail. The sensor consists of a rotor and a stator. The rotor is a disk (or a circular crown) of dielectric material, where one or several arrays of equidistant single-loop split ring resonators (SRRs) are etched along its edge, forming circular chains of hundreds of SRRs. The stator is a coplanar waveguide (CPW) also loaded with pairs of single-loop SRRs (etched in the back substrate side), with the centers located in the slot region. The sensing principle is based on the amplitude modulation of a harmonic (single tone continuous wave) feeding signal, achieved when the chains of the rotor are displaced over the SRR pairs of the stator. Both sensor elements (rotor and stator) must be parallel oriented, with the SRR pairs of the CPW in close proximity to the SRR chains of the rotor (and rotated 180 o), in order to favor their coupling. By this means, the transmission coefficient of the CPW is varied by the circular motion of the rotor, and significant amplitude modulation of the feeding signal is achieved. From the envelope function, the angular velocity can be accurately determined. With the proposed sensors, instantaneous and practically unlimited rotation speeds can be measured.

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“…Then, these global features can be used for cell classification tasks 21,22 and to construct quantitative images of analytes. 20,23 Microwave resonators can be used as effective sensors 24 for concentration 25,26 and particle detection. 27,28 These sensors are usually characterized with a network analyzer where the frequency and the linewidth of the resonance can be monitored.…”

Section: Introductionmentioning

confidence: 99%

Towards microwave imaging of cells

et al. 2018

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Integrated detection techniques that can characterize the morphological properties of cells are needed for the widespread use of lab-on-a-chip technology. Herein, we establish a theoretical and experimental framework to use resonant microwave sensors in their higher order modes so that the morphological properties of analytes inside a microfluidic channel can be obtained electronically. We built a phase-locked loop system that can track the first two modes of a microstrip line resonator to detect the size and location of microdroplets and cells passing through embedded microfluidic channels. The attained resolution, expressed in terms of Allan deviation at the response time, is as small as 2 × 10 for both modes. Additionally, simulations were performed to show that sensing with higher order modes can yield the geometrical volume, effective permittivity, two-dimensional extent, and the orientation of analytes. The framework presented here makes it possible to develop a novel type of microscope that operates at the microwave band, i.e., a radar for cells.

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Microwave microfluidic sensor for determination of glucose concentration in water

Cited by 87 publications

References 15 publications

Microwave Differential Frequency Splitting Sensor Using Magnetic-LC Resonators

Microwave Differential Frequency Splitting Sensor Using Magnetic-LC Resonators

Application of Split Ring Resonator (SRR) Loaded Transmission Lines to the Design of Angular Displacement and Velocity Sensors for Space Applications

Towards microwave imaging of cells

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