Multi-modal millimeter-wave sensors for plastic polymer material characterization

Chudpooti, Nonchanutt; Doychinov, Viktor; Hong, Binbin; Akkaraekthalin, Prayoot; Robertson, I.D.; Somjit, Nutapong

doi:10.1088/1361-6463/aac818

Cited by 13 publications

(6 citation statements)

References 32 publications

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“…While the relative permittivity and loss tangent of SU-8 2000 were 3.22 and 0.025, respectively. Of note, this result of SU-8 2000 was strongly comparable to those previous published in [4].…”

Section: A Sensor Optimization and Materials Characterizationsupporting

confidence: 91%

“…The short-circuited termination is inserted to one port on the sensor that the distance between this termination and the CSRR is kept at g/4. regarding the tailor-made WR10 waveguide fabrication can be found in [3]- [4]. Complete assembly of the sensor is shown in Fig.…”

Section: Fabrication and Integration Structurementioning

confidence: 99%

“…Thickness measurement of dielectric and polymer structures is an important process in many industrial and medical applications [1]- [4]. Several techniques for thickness characterization have been developed.…”

Section: Introductionmentioning

confidence: 99%

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96-GHz Complementary Split Ring Resonator for Thin Photoresist Film Thickness Characterization

Chudpooti

Akkaraekthalin

et al. 2019

2019 Research, Invention, and Innovation Congress (RI2C)

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Non-destructive thickness measurement offers a valuable feature for thin polymer-based applications in both industrial and medical utilization. Herein, we developed a novel, non-destructive, millimetre-wave WR-10 waveguide sensor for measuring a dielectric film layer on a transparent substrate. Complementary split-ring resonator (CSRR) was integrated on top of a customized WR10 waveguide and operated at 96 GHz. The thickness of the SU-8 layers, ranging from 3-13 m, coated on a glass substrate was then examined using the resonant frequency shift. The thickness values obtained from this novel sensor strongly resemble the values obtained from standard surface profiler measurement method, with less than 5 % difference. Thus, our novel design offers a comparable accuracy with a better cost effectiveness when compare with an existing commercial instrument.

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Section: A Sensor Optimization and Materials Characterizationsupporting

confidence: 91%

Section: Fabrication and Integration Structurementioning

confidence: 99%

See 1 more Smart Citation

96-GHz Complementary Split Ring Resonator for Thin Photoresist Film Thickness Characterization

Chudpooti

Akkaraekthalin

et al. 2019

2019 Research, Invention, and Innovation Congress (RI2C)

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“…e local mobility and nature of the polymer-polymer interactions can be investigated through dielectric relaxation [31]. Recent studies have revealed that there are several methods for [32][33][34][35][36]. In particular, impedance measurements at various frequencies are found to be an accurate method to study the molecular motion of dielectric materials at different temperatures [29,36].…”

Section: Dielectric and Electric Modulus Studymentioning

confidence: 99%

Design of Polymer Blends Based on Chitosan:POZ with Improved Dielectric Constant for Application in Polymer Electrolytes and Flexible Electronics

Aziz

Hamsan

Kadir

et al. 2020

Advances in Polymer Technology

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There is a considerable demand for the development and application of polymer materials in the flexible electronic- and polymer-based electrolyte technologies. Chitosan (CS) and poly(2-ethyl-2-oxazoline) (POZ) materials were blended with different ratios to obtain CS:POZ blend films using a straightforward solution cast technique. The work was involved a range of characteristic techniques, such as impedance spectroscopy, X-ray diffraction (XRD), and optical microscopy. From the XRD spectra, an enhancement in the amorphous nature in CS:POZ blend films was revealed when compared to the pure state of CS. The enhancement was verified from the peak broadening in CS:POZ blend films in relative to the one in crystalline peaks of the CS polymer. The optical micrograph study was used to designate the amorphous and crystalline regions by assigning dark and brilliant phases, respectively. Upon increasing POZ concentration, the dielectric constant was found to increase up to ɛ′ = 6.48 (at 1 MHz) at 15 wt.% of POZ, and then a drop was observed beyond this amount. The relatively high dielectric constant and dielectric loss were found at elevated temperatures. The increase of POZ concentration up to 45 wt.% made the loss tangent to shift to the lower frequency side, which is related to increasing resistivity. The increases of dielectric constant and dielectric loss with temperature were attributed to the increase of polarisation. The loss tangent peaks were found to shift to the higher frequency side as temperature elevated. Obvious relaxation peaks were observed in the imaginary part of electric modulus, and no peaks were found in the dielectric loss spectra. The concentration dependent of M″ peaks was found to follow the same trend of loss tangent peaks versus POZ content. The relaxation process was studied in terms of electric modulus parameters.

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“…With microwave measurement techniques, there are several methods to indicate liquid ingredients from liquid-mixture solutions, e.g., resonance frequency [18], [30]- [32], transmission level [17], [32]- [33], phase and quality factor (Q-factor) [23]. Various liquid-mixture sensors based on microwave technologies have been extensively investigated, such as split-ring resonator [34]- [36], complementary split-ring resonator (CSRR) structures [17], [31]- [32], [37]- [38], interdigital structures [8], substrate integrated-waveguide (SIW) structures [18], waveguide structures [30] and mushroom-like structures [23]. These techniques offer a good measurement accuracy [17]- [18], [31], with, generally, nondestructive measurement and short assay time.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Self-Aligned NaCl-Solution Fluidic-Integrated Microwave Sensors for Industrial and Biomedical Applications

et al. 2020

Self Cite

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This work presents, for the first time, an in-situ self-aligned fluidic-integrated microwave sensor for characterizing NaCl contents in NaCl-aqueous solution based on a 16-GHz bandpass combline cavity resonator. The discrimination of the NaCl concentration is achievable by determining amplitude differences and resonant frequency translations between the incident and reflected microwave signals at the input terminal of the cavity resonator based on the capacitive loading effects of the comb structure inside the cavity introduced by the NaCl solution under test. Twelve NaCl-aqueous liquid mixture samples with different NaCl concentrations ranging from 0% to 20% (0-200 mg/mL), which are generally exploited in most industrial and biomedical applications, were prepared and encapsulated inside a Teflon tube performing as a fluidic channel. The Teflon tube is subsequently inserted into the cavity resonator through two small holes, fabricated through the sidewalls of the cavity, which can be used to automatically align the fluidic subsystem inside the combline resonator considerably easing the sensor setup. Based on at least five repeated measurements, the NaCl sensor can discriminate the NaCl content of as low as 1% with the measurement accuracy of higher than 96% and the maximum standard deviation of only 0.0578. There are several significant advantages achieved by the novel NaCl sensors, e.g. high accuracy, traceability and repeatability; ease of sensor setup and integration to actual industrial and biomedical systems enabling insitu and real-time measurements; noninvasive and noncontaminative liquid solution characterization as well as superior sensor reusability due to a complete physical separation between the fluidic and microwave subsystems.

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Multi-modal millimeter-wave sensors for plastic polymer material characterization

Cited by 13 publications

References 32 publications

96-GHz Complementary Split Ring Resonator for Thin Photoresist Film Thickness Characterization

96-GHz Complementary Split Ring Resonator for Thin Photoresist Film Thickness Characterization

Design of Polymer Blends Based on Chitosan:POZ with Improved Dielectric Constant for Application in Polymer Electrolytes and Flexible Electronics

In-Situ Self-Aligned NaCl-Solution Fluidic-Integrated Microwave Sensors for Industrial and Biomedical Applications

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