scholarly journals High sensitivity simple structured displacement sensor using corrugated substrate‐integrated waveguide (CSIW)

2020 ◽  
Vol 14 (5) ◽  
pp. 414-418 ◽  
Author(s):  
Abbas Soltan ◽  
Ramazan Ali Sadeghzadeh ◽  
Sajad Mohammad‐Ali‐Nezhad
Keyword(s):  
High Sensitivity ◽  
Displacement Sensor ◽  
Substrate Integrated Waveguide

scholarly journals A High-Sensitivity Microfluidic Sensor Based on a Substrate Integrated Waveguide Re-Entrant Cavity for Complex Permittivity Measurement of Liquids

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 4005 ◽  
Author(s):  
Zhihua Wei ◽  
Jie Huang ◽  
Jing Li ◽  
Guoqing Xu ◽  
Zongde Ju ◽  
...  
Keyword(s):  
Predictive Model ◽  
Complex Permittivity ◽  
Perturbation Technique ◽  
Microfluidic Channel ◽  
High Sensitivity ◽  
Substrate Integrated Waveguide ◽  
Debye Relaxation ◽  
Permittivity Measurement ◽  
Acetone Water ◽  
Complex Permittivity Measurement

In this study, a novel non-invasive and contactless microwave sensor using a square substrate integrated waveguide (SIW) re-entrant cavity is proposed for complex permittivity measurement of chemical solutions. The working principle of this sensor is based on cavity perturbation technique, in which the resonant properties of cavity are utilized as signatures to extract the dielectric information of liquid under test (LUT). A winding microfluidic channel is designed and embedded in the gap region of the cavity to obtain a strong interaction between the induced electric field and LUT, thus achieving a high sensitivity. Also, a mathematical predictive model which quantitatively associates the resonant properties of the sensor with the dielectric constant of LUT is developed through numerical analysis. Using this predictive model, quick and accurate extraction of the complex permittivity of LUT can be easily realized. The performance of this sensor is then experimentally validated by four pure chemicals (hexane, ethyl acetate, DMSO and water) together with a set of acetone/water mixtures in various concentrations. Experimental results demonstrate that the designed sensor is capable of characterizing the complex permittivities of various liquids with an accuracy of higher than 96.76% (compared with the theoretical values obtained by Debye relaxation equations), and it is also available for quantifying the concentration ratio of a given binary mixture.

scholarly journals Multifunctional Ultrahigh Sensitive Microwave Planar Sensor to Monitor Mechanical Motion: Rotation, Displacement, and Stretch

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1184 ◽  
Author(s):  
Mohammad Abdolrazzaghi ◽  
Mojgan Daneshmand
Keyword(s):  
Dynamic Range ◽  
Full Range ◽  
Electric Circuit ◽  
High Sensitivity ◽  
Parameter Extraction ◽  
Split Ring Resonator ◽  
Displacement Sensor ◽  
Rotation Sensor ◽  
Mechanical Deformations ◽  
Electric Circuit Model

This paper presents a novel planar multifunctional sensor that is used to monitor physical variations in the environment regarding distance, angle, and stretch. A double split-ring resonator is designed at 5.2 GHz as the core operating sensor. Another identical resonator is placed on top of the first one. The stacked configuration is theoretically analyzed using an electric circuit model with a detailed parameter extraction discussion. This design is first employed as a displacement sensor, and a compelling high sensitivity of 500 MHz/mm is observed for a wide dynamic range of 0-5 mm. Then, in another configuration, the stacked design is used as a rotation sensor that results in a high sensitivity of 4.5 MHz/ ° for the full range of 0-180 ° . In addition, the stacked resonator is utilized as a strain detector, and a 0–30% stretch is emulated with a linear sensitivity of 12 MHz/%. Measurements are well in congruence with simulated results, which proves the accurate functionality of the sensor in tracking mechanical deformations, all in a single compact contraption.

scholarly journals Micro-displacement sensor based on high sensitivity photonic crystal

2014 ◽  
Vol 4 (3) ◽  
pp. 220-224 ◽  
Author(s):  
Saeed Olyaee ◽  
Morteza Azizi
Keyword(s):  
Photonic Crystal ◽  
High Sensitivity ◽  
Displacement Sensor

High sensitivity waveguide micro-displacement sensor based on intermodal interference

2017 ◽  
Vol 19 (11) ◽  
pp. 115804 ◽  
Author(s):  
Lanting Ji ◽  
Guobing He ◽  
Yang Gao ◽  
Yan Xu ◽  
Honglei Liang ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Displacement Sensor

scholarly journals A Compact Double-Folded Substrate Integrated Waveguide Re-Entrant Cavity for Highly Sensitive Humidity Sensing

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3308 ◽  
Author(s):  
Zhihua Wei ◽  
Jie Huang ◽  
Jing Li ◽  
Junshan Li ◽  
Xuyang Liu ◽  
...  
Keyword(s):  
Humidity Sensor ◽  
High Sensitivity ◽  
Substrate Integrated Waveguide ◽  
Humidity Sensing ◽  
Food Industries ◽  
High Q ◽  
Sensing Applications ◽  
Compact Size ◽  
Highly Sensitive ◽  
Humidity Chamber

In this study, an ultra-compact humidity sensor based on a double-folded substrate integrated waveguide (SIW) re-entrant cavity was proposed and analyzed. By folding a circular re-entrant cavity twice along its two orthogonally symmetric planes, the designed structure achieved a remarkable size reduction (up to 85.9%) in comparison with a conventional TM010-mode circular SIW cavity. The operating principle of the humidity sensor is based on the resonant method, in other words, it utilizes the resonant properties of the sensor as signatures to detect the humidity condition of the ambient environment. To this end, a mathematical model quantitatively relating the resonant frequency of the sensor and the relative humidity (RH) level was established according to the cavity perturbation theory. The sensing performance of the sensor was experimentally validated in a RH range of 30%–80% by using a humidity chamber. The measured absolute sensitivity of the sensor was calculated to be 135.6 kHz/%RH, and the corresponding normalized sensitivity was 0.00627%/%RH. It was demonstrated that our proposed sensor not only has the merits of compact size and high sensitivity, but also benefits from a high Q-factor and ease of fabrication and integration. These advantages make it an excellent candidate for humidity sensing applications in various fields such as the agricultural, pharmaceutical, and food industries.

Temperature Effect on the Sensitivity of a Highly Sensitive Micro-Machined Displacement Sensor

2012 ◽  
Vol 622-623 ◽  
pp. 1396-1400
Author(s):  
Tania Mukherjee ◽  
Tarun K. Bhattacharyya
Keyword(s):  
Electric Field ◽  
Temperature Effect ◽  
Field Emission ◽  
Applied Electric Field ◽  
Tunneling Current ◽  
High Sensitivity ◽  
Emission Current ◽  
Displacement Sensor ◽  
Field Emission Current ◽  
Displacement Sensitivity

In this paper, a comparative study of temperature effect which introduces a thermionic current under a high applied electric field, on three different modes of field emission current, such as Tunneling current, Fowler-Nordheim current and Field emission current in between these two regions has been done. Moreover, an idea of micromechanical displacement sensor with high sensitivity, operating in Fowler-Nordheim current mode, has been proposed. The displacement sensitivity of proposed sensor in Fowler-Nordheim current domain is about 10-9 m/A. The displacement sensitivity has been shifted from its expected value due to thermal effect (at 700K temperature) at about 1010V/m applied electric field across tip gap.

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