Zeroth-Order Resonator Based on Mushroom-like Structure for Liquid Mixture Concentration Sensing of Sodium Chloride Solution

Pechrkool, Tanaporn; Chudnooti, Nonchanutt; Duangrit, Nattapong; Chaimool, Sarawuth; Akkaraekthalin, Prayoot

doi:10.1109/cama47423.2019.8959565

Cited by 5 publications

(2 citation statements)

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“…NaCl-aqueous solutions play a significant role in many chemical processes in a wide variety of chemical and biological applications. Highly sensitive detection of NaCl concentration in aqueous solution may become a powerful technique for studying many useful biological properties of various liquid materials [19]- [23]. There are several techniques for sensing or classifying NaCl contents in liquid solutions.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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

et al. 2020

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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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Section: Introductionmentioning

confidence: 99%