Journal ArticleDOI
Liquid Sensing Using Active Feedback Assisted Planar Microwave Resonator
TLDR
In this article, a planar microstrip resonator was used for real-time sensing of fluid properties at microwave frequencies with a quality factor of 22,000 at 1.4 GHz for water-based concentration detection.Abstract:
A novel electromagnetic sensor operating at microwave frequencies with quality factor of 22,000 at 1.4 GHz for real-time sensing of fluid properties is presented. The core of the sensor has a planar microstrip resonator, which is enhanced using an active feedback loop. The resonance frequency and quality factor of the sensor show clear differentiation between analytes composed of common solvents. To evaluate the sensor for water based concentration detection, we have demonstrated that KOH dilutions as low as 0.1 mM are detectable. The proposed sensor has advantages of inexpensiveness and high resolution as well as capability for miniaturization and CMOS compatibility.read more
Citations
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Journal ArticleDOI
Ultrahigh-Sensitivity Microwave Sensor for Microfluidic Complex Permittivity Measurement
TL;DR: In this paper, a very high-sensitivity microwave sensor made of a microstrip transmission line loaded with a shunt-connected series LC resonator is proposed, where a large sensitivity for dielectric loadings is achieved by incorporating just one capacitor in the resonator structure.
Journal ArticleDOI
Transmission Lines Terminated With LC Resonators for Differential Permittivity Sensing
TL;DR: In this article, a differential microwave permittivity sensor based on the reflection coefficient of microstrip lines terminated with series $LC$ resonators is presented, where two identical sensing elements are used for differential sensing, providing the possibility of simultaneous two samples detection.
Journal ArticleDOI
3-D Printing Microfluidic Channels With Embedded Planar Microwave Resonators for RFID and Liquid Detection
TL;DR: In this paper, a planar resonator is embedded within a 3-D printed fluidic channel for liquid sensing applications with a maximum detectable resolution of 1000 ppm (0.1 V%) ethanol in water.
Journal ArticleDOI
Sensitivity enhancement in planar microwave active-resonator using metal organic framework for CO2 detection
Mohammad Hossein Zarifi,Abedeh Gholidoust,Mohammad Abdolrazzaghi,Pooya Shariaty,Zaher Hashisho,Mojgan Daneshmand +5 more
TL;DR: In this paper, the authors presented a proof of concepts of CO 2 gas monitoring by a microwave sensor operating in microwave regime and study its sensitivity enhancement using an adsorbent bed of commercially available Zeolite 13X, and two synthesized MOF-199 (MOF- 199-M1 and MOF199-M2).
Journal ArticleDOI
Liquid sensing in aquatic environment using high quality planar microwave resonator
TL;DR: In this paper, an active, feedback loop assisted, planar, micro strip microwave resonator was used for non-contact liquid sensor operating in an aquatic environment with a distance of 0 to 8 cm. The active loop technique was shown to increase the primary quality factor from 210 to 500,000 in air when measured at a resonant frequency of 1.52 GHz.
References
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Atomic force microscope–force mapping and profiling on a sub 100‐Å scale
TL;DR: In this paper, a modified version of the atomic force microscope is introduced that enables a precise measurement of the force between a tip and a sample over a tip-sample distance range of 30-150 A.
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A planar split-ring resonator-based microwave biosensor for label-free detection of biomolecules
Hee Jo Lee,Jung Hyun Lee,Hui Sung Moon,Ik Soon Jang,Jong Soon Choi,Jong-Gwan Yook,Hyo Il Jung +6 more
TL;DR: From the experimental results, it is confirmed that the device is very effective RF biosensor with a limit of detection (LOD) of 100 pg/ml and has sufficiently feasibility as a label-free biosensing scheme.
Journal ArticleDOI
A Microwave Resonant Sensor for Concentration Measurements of Liquid Solutions
TL;DR: In this paper, a microwave resonator is used for concentration measurements of liquid compounds, where the coupling structure is optimized by means of a finite element code so as to achieve a high Q-factor.
Journal ArticleDOI
Improved Split-Ring Resonator for Microfluidic Sensing
David Rowe,Sultan al-Malki,Ali A. Abduljabar,Adrian Porch,David Anthony Barrow,Christopher John Allender +5 more
TL;DR: In this paper, a method of making low-loss split-ring resonators (SRRs) for microfluidic sensing at microwave frequencies using silver-coated copper wire is presented.
Journal ArticleDOI
Detection of Volatile Organic Compounds Using Microwave Sensors
Mohammad Hossein Zarifi,Amirreza Sohrabi,Parmiss Mojir Shaibani,Mojgan Daneshmand,Thomas Thundat +4 more
TL;DR: In this paper, a microwave-based sensing platform for detection of acetone vapor is demonstrated, which consists of an MW resonator coated with a thin layer of polydimethylsiloxane (PDMS) that acts as a sorbent layer for acetone.