Frying Oil Evaluation by a Portable Sensor Based on Dielectric Constant Measurement

Liu, Mei; Qin, Xiangzheng; Chen, Zhanghao; Tang, Lei; Borom, Brandon; Cao, Ning; Barnes, D. C.; Cheng, Kai; Chen, Jinbo; Wang, Tao; Rao, Jinjun

doi:10.3390/s19245375

Cited by 12 publications

(12 citation statements)

References 25 publications

(34 reference statements)

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“…Therefore, the readout circuit is selected with a size of 7.5pF, and the capacitance precision error is less than 0.05pF. In addition to the reference capacitance being a necessary design consideration, it is also important to note that the parasitic capacitance at the micro-capacitance input is as small as possible and that the line between the measured capacitance and the input port of the reference capacitance distance detection chip needs to be short enough [12].…”

Section: Hardware Circuit Designmentioning

confidence: 99%

Design of readout circuit for high sampling miniaturized MEMS wall shear force sensor

Guo

Liu

et al. 2022

J. Phys.: Conf. Ser.

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Wall shear stress is one of the important measurement parameters in wind tunnel experiments. In the shock wind tunnel, the duration of the flow field is very short, usually a few milliseconds. To ensure measurement accuracy, the sampling rate should not be less than 1kHz. Due to the limitation of model volume and experimental environment, it is necessary to design a miniaturized readout circuit with high precision and high sampling rate, which is highly integrated with the MEMS wall shear stress sensor. The circuit includes a micro capacitance detection module integrated with the sensor head and a host computer signal processing and display module. Aiming at the complex measurement environment of the shock tunnel, to ensure the measurement accuracy, stability, and anti-interference ability of the weak capacitance detection circuit, a miniaturized ceramic substrate circuit is fabricated by a microstrip circuit process. The test results show that the resolution of the micro capacitance of the circuit can reach 20fF at the detection frequency of 3kHz, which can meet the measurement requirements of Shock tunnel, and realize the real-time measurement and display of wall shear stress signal.

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Section: Hardware Circuit Designmentioning

confidence: 99%

Design of readout circuit for high sampling miniaturized MEMS wall shear force sensor

Guo

Liu

et al. 2022

J. Phys.: Conf. Ser.

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“…Fendri et al, in 2019, presented an interdigital capacitive sensor for frying oil quality assessment and the results have shown a very good correlation (R 2 = 0.97) with reference methods [13]. A similar approach was used by Liu et al, in 2019, who developed a portable sensor system based on an STM32 microcontroller (ST Microelectronics) for frying oil quality measurement [14]. Electrochemical sensing can also be implemented by means of biosensors, where a bio-receptor is immobilized on the electrode to allow specific detection.…”

Section: Introductionmentioning

confidence: 97%

A Portable Battery-Operated Sensor System for Simple and Rapid Assessment of Virgin Olive Oil Quality Grade

et al. 2022

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Virgin olive oil quality is assessed by chemical as well as sensory analysis. Two of the most important parameters that define the quality of virgin olive oils are the free acidity and the peroxide index. These chemical parameters are usually determined by manual titration procedures that must be carried out in a laboratory by trained personnel. In this paper, a portable sensor system to support the quality grade assessment of virgin olive oil is presented. The system is battery operated and characterized by small dimensions, light weight and quick measurement response (about 30 s). The working principle is based on the measurement of the electrical conductance of an emulsion between a chemical reagent and the olive oil sample. Two different chemical reagents have been investigated: (1) a hydro-alcoholic solution (HAS), made of 60% ethanol and 40% distilled water; (2) 100% distilled water (DW). Tests have been carried out on a set of 40 olive oil samples. The results have shown how, for most of the fresh virgin olive oil samples (31 samples out of 40), the free acidity can be estimated with good accuracy from the electrical conductance of the emulsion using HAS as the reagent. In the case of the full set of samples, the emulsion electrical conductance, using HAS as the reagent, is a function of both the sample free acidity as well as the compounds produced by oil oxidation, and a compensation method based on the measured electrical conductance, using DW as the reagent, has been introduced to improve the accuracy in the estimated free acidity. Tests have also been carried out on the full set of samples, using a k-nearest neighbors algorithm, to demonstrate the feasibility of olive oil classification according to the quality grade. The results have shown how measurements carried out using only the HAS reagent provide better classification accuracy than measurements carried out using both the HAS and DW reagents. The proposed system can be a low-cost alternative to standard laboratory analyses to evaluate the quality grade of virgin olive oil.

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“…Peroxide is the principal result of oil chemical breakdown and contributes to nonvolatile polar molecules (PC) [ 12 – 14 ]. A capacitive sensor can be used to assess polar chemicals in oil [ 15 , 16 ]. Oil permittivity is defined as the ratio of capacitance in oil to that in air and can be used as a quality indicator [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Characterization and Modeling Quality Analysis of Edible Oils Using Electrochemical Impedance Spectroscopy

Elmosalami

Kamel

Tomashchuk

et al. 2022

International Journal of Food Science

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The dielectric characteristics of six culinary oils were measured over the frequency range of 0.01 Hz–100 kHz. The results showed that the dielectric constants of oils had the same frequency relationship (i.e., they decreased with increasing frequency). The dielectric constants at lower frequencies for olive oil A, olive oil B, sesame oil, Nigella sativa, sunflower oil, and corn oil are approximately 2.75, 2.5, 2.0, 1.75, 1.5, and 0.9. An FT-IR analysis showed that the spectral differences were very small, because most vegetable oils contain the same type of fatty acids. The model built using COMSOL Multiphysics for the potential and electric field distributions for different oils and used to calculate the dielectric constant was simulated under various conditions in the AC/DC module. The model results were compared with the experimental results, which showed satisfactory convergence between them. The experimental and model results obtained in this study could be useful for evaluating the edible oil quality.

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Frying Oil Evaluation by a Portable Sensor Based on Dielectric Constant Measurement

Cited by 12 publications

References 25 publications

Design of readout circuit for high sampling miniaturized MEMS wall shear force sensor

Design of readout circuit for high sampling miniaturized MEMS wall shear force sensor

A Portable Battery-Operated Sensor System for Simple and Rapid Assessment of Virgin Olive Oil Quality Grade

Characterization and Modeling Quality Analysis of Edible Oils Using Electrochemical Impedance Spectroscopy

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