Microwave Sensor for Nondestructive, Volume-Independent Liquid Characterization

SummaryIn this paper, a microwave sensor is designed and built to measure the permittivity of aqueous solutions. The samples used in this experiment are different purities of ethanol mixed with water. Ethanol solution with different purities is a widely used material in industry. Structures of meander, ladder, and T‐structure were used to design the sensor. Then the designed sensor is simulated in CST software in range of relative dielectric from 10 to 80. After obtaining the desired answer in the simulation, the proposed sensor is built on the Rogers 4003 substrate, the built‐in sensor measured ethanol solution with a purity of 5% to 35% (equivalent to permittivity of 76 to 58), and is showed a sensitivity of 4% and a Q‐factor of 3500. The results of simulation and measurement are consistent with each other, and they indicated that the proposed sensor beyond the fluids can be supported and determine their relative dielectrics.

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Measurement of low‐loss aqueous solutions permittivity with high detection accuracy by a contact and free‐label resonance microwave sensor

Navaei

Rezaei

Kiani

2022

Int J Communication

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Determining the Freshness of Living Tissue Using an Accurate and Sensitive Microwave Sensor

Navaei,

Rezaei

2023

Iran J Sci Technol Trans Electr Eng

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Design of Microwave Electromagnetic Sensor for Liquid Characterization

Arumugam,

Edhayaraj,

Shanmugavadivelu

et al. 2023

JHCT

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The design, fabrication, and testing of a highly sensitive GHz sensor for real-time measurement of engine oil quality are presented in this paper. The proposed microwave sensor is constructed on symmetric square slots structures, to improve the performance of the sensor. By using the resonant perturbation theory, the change in the max E field of test samples, produce the frequency shift. The footprint of the designed sensor is (0.5523λeff × 0.0920λeff) where λeff is the effective wavelength value calculated at the operating frequency of 5.52GHz. The oil sample adulteration analysis is done by immersion of a dielectric probe up to a reference level of 20 mm. Thus, the dielectric behavior of the sensor is estimated with an average sensitivity of 1.7. The performance of the microwave sensor is evaluated by submerging it in different engine oil samples, thereby resulting in frequency shifts from 5.53 to lower values. The result obtained from it indicated that the sensor has a quality factor of 54.55 and a FoM of 19.17. Thus, the proposed GHz sensor due to its good sensitivity, FoM, and quality factor is the eminent solution for the automobile industry.

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Microwave Sensor for Nondestructive, Volume-Independent Liquid Characterization

Cited by 3 publications

References 17 publications

Measurement of low‐loss aqueous solutions permittivity with high detection accuracy by a contact and free‐label resonance microwave sensor

Measurement of low‐loss aqueous solutions permittivity with high detection accuracy by a contact and free‐label resonance microwave sensor

Determining the Freshness of Living Tissue Using an Accurate and Sensitive Microwave Sensor

Design of Microwave Electromagnetic Sensor for Liquid Characterization

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