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Journal articles on the topic 'Contactless conductivity measurement'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Bohuslávek, Zdeněk. "The measurement method of meat conductivity." Czech Journal of Food Sciences 36, No. 5 (2018): 372–77. http://dx.doi.org/10.17221/164/2018-cjfs.

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This paper analyses the properties of electrode methods and contactless inductive methods of the conductivity measurement of biological tissue, which are one of the few which are able to measure the potentials of corresponding components of complex conductivity, i.e. the real reactive conductivity of a resistive and an imaginary component. The analysis was performed by computer modelling and experimental measurements. The publication describes the modelling of currents and of the potential by electrode and methods on tissue phantoms using the finite element method. The Comsol Multiphysics v3.4

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2

Krupka, Jerzy. "Microwave Measurements of Electromagnetic Properties of Materials." Materials 14, no. 17 (2021): 5097. http://dx.doi.org/10.3390/ma14175097.

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A review of measurement methods of the basic electromagnetic parameters of materials at microwave frequencies is presented. Materials under study include dielectrics, semiconductors, conductors, superconductors, and ferrites. Measurement methods of the complex permittivity, the complex permeability tensor, and the complex conductivity and related parameters, such as resistivity, the sheet resistance, and the ferromagnetic linewidth are considered. For dielectrics and ferrites, the knowledge of their complex permittivity and the complex permeability at microwave frequencies is of practical inte

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3

Tang, Xiao-Yu, Junchao Huang, Haifeng Ji, Baoliang Wang, and Zhiyao Huang. "New Contactless Conductivity Detection (CCD) Sensor for Fluid Conductivity Measurement." IEEE Sensors Journal 20, no. 19 (2020): 11256–64. http://dx.doi.org/10.1109/jsen.2020.2998800.

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4

Ye, Ming, Xiao-Long Zhao, Wei-Da Li, Yu Zhou, Jia-Yi Chen, and Yong-Ning He. "Conductivity Extraction Using a 180 GHz Quasi-Optical Resonator for Conductive Thin Film Deposited on Conductive Substrate." Materials 13, no. 22 (2020): 5260. http://dx.doi.org/10.3390/ma13225260.

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Measurement of electrical conductivity of conductive thin film deposited on a conductive substrate is important and challenging. An effective conductivity model was constructed for a bilayer structure to extract thin film conductivity from the measured Q-factor of a quasi-optical resonator. As a demonstration, aluminium films with thickness of 100 nm were evaporated on four silicon wafers whose conductivity ranges from ~101 to ~105 S/m (thus, the proposed method can be verified for a substrate with a wide range of conductivity). Measurement results at ~180 GHz show that average conductivities

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Venugopal, Namitha, K. H. Abdul Nazer, Hrithik Krishnaraj, V. K. Chinnu, and Pankaj Sagar. "Non-Destructive Measurement of Electrical Conductivity in Thin-Film Nb coated Cu for SRF Cavities using Planar Eddy Current Sensors." IOP Conference Series: Materials Science and Engineering 1327, no. 1 (2025): 012216. https://doi.org/10.1088/1757-899x/1327/1/012216.

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Abstract A novel contactless method for measuring the electrical conductivity of thin-film niobium (Nb) superconductors is presented. The impedance of the planar eddy current sensors is measured with thin film Nb-coated targets and Cu-only targets. The difference in resistance ∆R is a function of the film’s conductivity. Experiments identified a distinct minimum in ∆R with and without the Nb film on copper (Cu) substrates across various frequencies. Conductivity was calculated using a theoretical model. The impedance of the planar eddy current sensors was measured at room and liquid nitrogen t

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6

Ju, Yang, YO Hirosawa, Masumi Saka, and Hiroyuki Abé. "Contactless Measurement of Thin Film Conductivity by a Microwave Compact Equipment." International Journal of Modern Physics B 17, no. 08n09 (2003): 1904–9. http://dx.doi.org/10.1142/s021797920301985x.

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A method for contactless measurement of the conductivity of thin conducting film was demonstrated. In order to apply the technique to on-line testing, a large standoff distance of 35 mm was obtained by using a reflector focusing sensor. The measurement was preformed by using a microwave compact equipment working at 94 GHz which was developed for decreasing the system cost. Indium Tin Oxide films having conductivity of 8.2 × 104 ~ 6.6 × 105 S/m on the glass substrates were used as the samples. Evaluation equation for determining the conductivity of Indium Tin Oxide films was generated.

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7

He, Yuchen, Qiang Huang, Yu He, et al. "A Low Excitation Working Frequency Capacitively Coupled Contactless Conductivity Detection (C4D) Sensor for Microfluidic Devices." Sensors 21, no. 19 (2021): 6381. http://dx.doi.org/10.3390/s21196381.

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In this work, a new capacitively coupled contactless conductivity detection (C4D) sensor for microfluidic devices is developed. By introducing an LC circuit, the working frequency of the new C4D sensor can be lowered by the adjustments of the inductor and the capacitance of the LC circuit. The limits of detection (LODs) of the new C4D sensor for conductivity/ion concentration measurement can be improved. Conductivity measurement experiments with KCl solutions were carried out in microfluidic devices (500 µm × 50 µm). The experimental results indicate that the developed C4D sensor can realize t

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8

Došlić, Marija, Damjan Pelc, and Miroslav Požek. "Contactless measurement of nonlinear conductivity in the radio-frequency range." Review of Scientific Instruments 85, no. 7 (2014): 073905. http://dx.doi.org/10.1063/1.4890557.

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9

Rohmfeld, S., Martin Hundhausen, and Lothar Ley. "Contactless Measurement of the Thermal Conductivity of Thin SiC Layers." Materials Science Forum 264-268 (February 1998): 657–60. http://dx.doi.org/10.4028/www.scientific.net/msf.264-268.657.

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10

Hao, H. Y., M. Neumann, C. Enss, and A. Fleischmann. "Contactless technique for thermal conductivity measurement at very low temperature." Review of Scientific Instruments 75, no. 8 (2004): 2718–25. http://dx.doi.org/10.1063/1.1777408.

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11

Zhuldybina, Mariia, Xavier Ropagnol, Charles Trudeau, Martin Bolduc, Ricardo Zednik, and François Blanchard. "Contactless In Situ Electrical Characterization Method of Printed Electronic Devices with Terahertz Spectroscopy." Sensors 19, no. 3 (2019): 444. http://dx.doi.org/10.3390/s19030444.

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Printed electronic devices are attracting significant interest due to their versatility and low cost; however, quality control during manufacturing is a significant challenge, preventing the widespread adoption of this promising technology. We show that terahertz (THz) radiation can be used for the in situ inspection of printed electronic devices, as confirmed through a comparison with conventional electrical conductivity methods. Our in situ method consists of printing a simple test pattern exhibiting a distinct signature in the THz range that enables the precise characterization of the stati

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12

Bouchala, T., B. Abdelhadi, and A. Benoudjit. "New contactless eddy current non-destructive methodology for electric conductivity measurement." Nondestructive Testing and Evaluation 30, no. 1 (2015): 63–73. http://dx.doi.org/10.1080/10589759.2014.992431.

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13

Zevin, V., J. T. Suss, A. Zemel, and S. Rotter. "A new method for contactless conductivity measurement of a semiconductor layer." Solid State Communications 66, no. 5 (1988): 553–55. http://dx.doi.org/10.1016/0038-1098(88)90980-5.

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14

Lianghiranthaworn, T., N. Hongsith, and S. Unai. "Frequency-based characterization of contactless conductivity detection with coplanar electrodes." Journal of Physics: Conference Series 2934, no. 1 (2025): 012033. https://doi.org/10.1088/1742-6596/2934/1/012033.

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Abstract This research aims to investigate the capacitively coupled contactless conductivity detection (C4D) method and evaluate its sensitivity to variations in the power source frequency. A particular emphasis is placed on the impact of frequency on the capacitance of the coplanar electrode design with a gap separation distance ranging from 0.2 to 0.8 mm. The capacitance sensor comprises a coplanar arrangement of electrodes fabricated with a printed circuit board (PCB) covered by a polydimethylsiloxane (PDMS) insulating layer. The experimental methodology involves measuring the capacitance f

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15

Huang, Qiang, Junchao Huang, Yandan Jiang, Haifeng Ji, Baoliang Wang, and Zhiyao Huang. "Investigation of the Effects of Electrode Geometry on the Performance of C4D Sensor with Radial Configuration." Sensors 21, no. 13 (2021): 4454. http://dx.doi.org/10.3390/s21134454.

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Electrodes are basic components of C4D (capacitively coupled contactless conductivity detection) sensors, and different electrode structures (the configuration pattern or the electrode geometry) can lead to different measurement results. In this work, the effects of electrode geometry of radial configuration on the measurement performance of C4D sensors are investigated. Two geometrical parameters, the electrode length and the electrode angle, are considered. A FEM (finite element method) model based on the C4D method is developed. With the FEM model, corresponding simulation results of conduc

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16

Sheng, Bixia, Junchao Huang, Haifeng Ji, and Zhiyao Huang. "A New Contactless Cross-Correlation Velocity Measurement System for Gas–Liquid Two-Phase Flow." Sensors 23, no. 10 (2023): 4886. http://dx.doi.org/10.3390/s23104886.

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Based on the principle of Contactless Conductivity Detection (CCD), a new contactless cross-correlation velocity measurement system with a three-electrode construction is developed in this work and applied to the contactless velocity measurement of gas–liquid two-phase flow in small channels. To achieve a compact design and to reduce the influence of the slug/bubble deformation and the relative position change on the velocity measurement, an electrode of the upstream sensor is reused as an electrode of the downstream sensor. Meanwhile, a switching unit is introduced to ensure the independence

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Berger, Marc, Anne Zygmanowski, and Stefan Zimmermann. "How Geometry Affects Sensitivity of a Differential Transformer for Contactless Characterization of Liquids." Sensors 21, no. 7 (2021): 2365. http://dx.doi.org/10.3390/s21072365.

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The electrical and dielectric properties of liquids can be used for sensing. Specific applications, e.g., the continuous in-line monitoring of blood conductivity as a measure of the sodium concentration during dialysis treatment, require contactless measuring methods to avoid any contamination of the medium. The differential transformer is one promising approach for such applications, since its principle is based on a contactless, magnetically induced conductivity measurement. The objective of this work is to investigate the impact of the geometric parameters of the sample or medium under test

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18

HIROSAWA, Yo, Yang JU, and Masumi SAKA. "Contactless Measurement of Conductivity of Conducting Film by Compact Millimeter-Wave Equipment." Proceedings of Conference of Tohoku Branch 2002 (2002): 215–16. http://dx.doi.org/10.1299/jsmeth.2002.215.

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19

Isono, Y., and M. Kotani. "A contactless method for measurement of electrical conductivity in a particular direction." Measurement Science and Technology 6, no. 9 (1995): 1429–32. http://dx.doi.org/10.1088/0957-0233/6/9/028.

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Wang, Baoliang, Ying Zhou, Haifeng Ji, Zhiyao Huang, and Haiqing Li. "Measurement of bubble velocity using Capacitively Coupled Contactless Conductivity Detection (C4D) technique." Particuology 11, no. 2 (2013): 198–203. http://dx.doi.org/10.1016/j.partic.2012.05.006.

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Ju, Yang, Yo Hirosawa, Hitoshi Soyama, and Masumi Saka. "Contactless measurement of electrical conductivity of Si wafers independent of wafer thickness." Applied Physics Letters 87, no. 16 (2005): 162102. http://dx.doi.org/10.1063/1.2105992.

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22

Yurchenko, V., T. S. Navruz, M. Ciydem, and A. Altintas. "Microwave Whispering-Gallery-Mode Photoconductivity Measurement of Recombination Lifetime in Silicon." Advanced Electromagnetics 8, no. 2 (2019): 101–7. http://dx.doi.org/10.7716/aem.v8i2.1127.

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We present a whispering-gallery-mode resonance-enhanced microwave-detected photoconductivity-decay method for contactless measurement of recombination lifetime in highresistivity semiconductor layers. We applied the method to undoped Silicon wafers of high resistivity at 5 and 30 kOhm*cm and measured the conductivity relaxation times of 10 and 14 microseconds, respectively. In wafers being considered, they are supposed to be defined by the electron-hole diffusion from the bulk to the wafer surfaces.

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23

Zhang, Ziyi, Mohammed Roula, and Richard Dinsdale. "Magnetic Induction Spectroscopy for Biomass Measurement: A Feasibility Study." Sensors 19, no. 12 (2019): 2765. http://dx.doi.org/10.3390/s19122765.

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Background: Biomass measurement and monitoring is a challenge in a number of biotechnology processes where fast, inexpensive, and non-contact measurement techniques would be of great benefit. Magnetic induction spectroscopy (MIS) is a novel non-destructive and contactless impedance measurement technique with many potential industrial and biomedical applications. The aim of this paper is to use computer modeling and experimental measurements to prove the suitability of the MIS system developed at the University of South Wales for controlled biomass measurements. Methods: The paper reports exper

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24

Krupka, Jerzy. "Contactless methods of conductivity and sheet resistance measurement for semiconductors, conductors and superconductors." Measurement Science and Technology 24, no. 6 (2013): 062001. http://dx.doi.org/10.1088/0957-0233/24/6/062001.

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25

Wang, Y. X., H. F. Ji, Z. Y. Huang, B. L. Wang, and H. Q. Li. "Online measurement of conductivity/permittivity of fluid by a new contactless impedance sensor." Review of Scientific Instruments 88, no. 5 (2017): 055111. http://dx.doi.org/10.1063/1.4983208.

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26

Fercher, Georg, Walter Smetana, and Michiel J. Vellekoop. "Microchip electrophoresis in low-temperature co-fired ceramics technology with contactless conductivity measurement." ELECTROPHORESIS 30, no. 14 (2009): 2516–22. http://dx.doi.org/10.1002/elps.200800654.

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27

Abad-Villar, Eva M., Pavel Kubán?, and Peter C. Hauser. "Evaluation of the detection of biomolecules in capillary electrophoresis by contactless conductivity measurement." Journal of Separation Science 29, no. 7 (2006): 1031–37. http://dx.doi.org/10.1002/jssc.200500495.

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28

Wernick, Helmut, Patrick Hoelzl, and Bernhard G. Zagar. "Visualization of spatial conductivity irregularities within conductive rubber sheets." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 35, no. 4 (2016): 1393–402. http://dx.doi.org/10.1108/compel-08-2015-0305.

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Purpose – The purpose of this paper is to present a fast and contactless measurement method to determine the spatial conductivity distribution within an intrinsically conducting polymer, more precisely a conductive rubber sheet specimen. As a consequence of the manufacturing process and the material composition, the conductivity distribution within the sheet is assumed to be inhomogeneous. Design/methodology/approach – The current density distribution within the conductive rubber sheet due to an excitation current is estimated from the measured magnetic field distribution. Therefore, a GMR sen

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29

Berger, Marc, Anne Zygmanowski, and Stefan Zimmermann. "Differential Inductive Sensing System for Truly Contactless Measuring of Liquids′ Electromagnetic Properties in Tubing." Sensors 21, no. 16 (2021): 5535. http://dx.doi.org/10.3390/s21165535.

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Certain applications require a contactless measurement to eliminate the risk of sensor-induced sample contamination. Examples can be found in chemical process control, biotechnology or medical technology. For instance, in critically ill patients requiring renal replacement therapy, continuous in-line monitoring of blood conductivity as a measure for sodium should be considered. A differential inductive sensing system based on a differential transformer using a specific flow chamber has already proven suitable for this application. However, since the blood in renal replacement therapy is carrie

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Ju, Yang, Kojiro Inoue, Masumi Saka, and Hiroyuki Abé. "Contactless measurement of electrical conductivity of semiconductor wafers using the reflection of millimeter waves." Applied Physics Letters 81, no. 19 (2002): 3585–87. http://dx.doi.org/10.1063/1.1520339.

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31

Pivarčiová, Elena, Pavol Božek, Kséniia Domnina, Emil Škultéty, and Sergey Fedosov. "Interferometric Measurement of Heat Transfer above New Generation Foam Concrete." Measurement Science Review 19, no. 4 (2019): 153–60. http://dx.doi.org/10.2478/msr-2019-0021.

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Abstract The contribution is focused on investigating the heat transfer via natural convection which originated as an effect of changed air density by heating the horizontal sample in the area given. For this research we used samples of a new material made in the Russian Federation – the foam concrete which was reinforced by PET fibres. The samples were heated by an electric heating device from the bottom. The temperature fields originating above the horizontal sample surface were visualised by means of the holographic interferometric contactless method in real time. The holographic interferog

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Ramírez-Chavarría, Roberto G., Jorge A. Uc-Martín, Bryan E. Alvarez-Serna, and Ramón F. Padilla-Morán. "Resonance-Induced Capacitively Coupled Contactless Conductivity Detection (ReC4D) Unit for Nucleic Acid Amplification Testing." Technologies 13, no. 4 (2025): 138. https://doi.org/10.3390/technologies13040138.

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Nucleic acid amplification (NAA) is a technique that increases the number of copies of a gene, making it possible to detect microorganisms. This technique is often used in clinical tests, biochemical analysis, and environmental assays, to mention only a few. However, developing portable, robust, and low-cost measurement platforms to evaluate NAA products remains a technological challenge. Therefore, in this work, we introduce an attractive unit for detecting and quantifying nucleic acids based on the capacitively coupled contactless conductivity detection (C4D) principle. The proposed unit, Re

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Rodrigues, Nuno M., Luis S. Rosado, and Pedro M. Ramos. "A portable embedded contactless system for the measurement of metallic material conductivity and lift-off." Measurement 111 (December 2017): 441–50. http://dx.doi.org/10.1016/j.measurement.2017.05.002.

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Ji, Haifeng, Ya Chang, Zhiyao Huang, Baoliang Wang, and Haiqing Li. "Voidage measurement of gas–liquid two-phase flow based on Capacitively Coupled Contactless Conductivity Detection." Flow Measurement and Instrumentation 40 (December 2014): 199–205. http://dx.doi.org/10.1016/j.flowmeasinst.2014.08.013.

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35

Ding, Yongsheng, and Kim Rogers. "Measurement of Nitrogen Mustard Degradation Products by Poly(dimethylsiloxane) Microchip Electrophoresis with Contactless Conductivity Detection." Electroanalysis 20, no. 20 (2008): 2192–98. http://dx.doi.org/10.1002/elan.200804320.

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Ding, Yongsheng, Carlos D. Garcia, and Kim R. Rogers. "Poly(dimethylsiloxane) Microchip Electrophoresis with Contactless Conductivity Detection for Measurement of Chemical Warfare Agent Degradation Products." Analytical Letters 41, no. 2 (2008): 335–50. http://dx.doi.org/10.1080/00032710701792943.

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37

Mikulewitsch, M., J. Dong, D. Stöbener, J. Epp, and A. Fischer. "Influences on Quantitative Nitriding Layer Thickness Measurements using Model-Based Photothermal Radiometry*." HTM Journal of Heat Treatment and Materials 77, no. 5 (2022): 357–73. http://dx.doi.org/10.1515/htm-2022-1024.

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Abstract In nitriding furnaces, the nitriding result is currently only controlled indirectly via the nitriding potential based on gas sensors. Detrimental properties such as soft spots, insufficient compound layer thickness or strongly porous zones, which might result from reduced surface reactivity, are thus only detected post-process. Therefore, in-process measurements of the layer formation promise a real benefit for energy efficiency and process quality enhancement. Photothermal radiometry is a promising contactless method for layer inspection that so far showed qualitative correlations of

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38

Shportenko, A. S., I. V. Kubasov, A. M. Kislyuk, A. V. Turutin, M. D. Malinkovich, and Yu N. Parkhomenko. "The effect of contact phenomena on the measurement of electrical conductivity of reduced lithium niobate." Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering 24, no. 3 (2021): 199–210. http://dx.doi.org/10.17073/1609-3577-2021-3-199-210.

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Lithium niobate (LN) is a ferroelectric material with a wide range of applications in optics and acoustics. Annealing of LN crystals in an oxygen-free environment leads to the appearance of black coloration and the concomitant increase in electrical conductivity due to chemical reduction. The literature presents many works on the study of the electrophysical properties of reduced crystals of LN, however, the contact phenomena arising during the measurement of electrical conductivity, as well as the interaction of the electrode material with the samples under study, are practically ignored. In

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Riboldi, Christian, Danilo A. Carnevale Castillo, Daniele M. Crafa, and Marco Carminati. "Contactless Sensing of Water Properties for Smart Monitoring of Pipelines." Sensors 23, no. 4 (2023): 2075. http://dx.doi.org/10.3390/s23042075.

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A key milestone for the pervasive diffusion of wireless sensing nodes for smart monitoring of water quality and quantity in distribution networks is the simplification of the installation of sensors. To address this aspect, we demonstrate how two basic contactless sensors, such as piezoelectric transducers and strip electrodes (in a longitudinal interdigitated configuration to sense impedance inside and outside of the pipe with potential for impedimetric leak detection), can be easily clamped on plastic pipes to enable the measurement of multiple parameters without contact with the fluid and,

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Zlatev, Zlatin, and Tanya Pehlivanova. "Development of an ultrasonic device for quality evaluation of yogurt." Engineering review 38, no. 3 (2018): 279–87. http://dx.doi.org/10.30765/er.38.3.4.

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In this article a possibility of application of the ultrasonic non-contact method for assessing the quality of yogurt was researched. A prediction assessment was made by an ultrasound based on four parameters – pH, conductivity, fat content, and viscosity. An ultrasonic device was developed to determine the parameters of yoghurt by modified ultrasound sensor available commercially. In order to obtain data for post-processing, a software application was designed for recognizing the ultrasonic signal through the image processing and analysis techniques.<br>The developed algorithms and proc

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Tan, Xihe, Achim Mester, Christian von Hebel, et al. "Simultaneous calibration and inversion algorithm for multiconfiguration electromagnetic induction data acquired at multiple elevations." GEOPHYSICS 84, no. 1 (2019): EN1—EN14. http://dx.doi.org/10.1190/geo2018-0264.1.

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Electromagnetic induction (EMI) is a contactless and fast geophysical measurement technique. Frequency-domain EMI systems are available as portable rigid booms with fixed separations up to approximately 4 m between the transmitter and the receivers. These EMI systems are often used for high-resolution characterization of the upper subsurface meters (up to depths of approximately 1.5 times the maximum coil separation). The availability of multiconfiguration EMI systems, which measure multiple apparent electrical conductivity ([Formula: see text]) values of different but overlapping soil volumes

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Andreev, I. V., V. M. Murav’ev, I. V. Kukushkin, J. H. Smet, K. von Klitzing, and V. Umanskii. "Contactless measurement of the conductivity of two-dimensional electrons in the regime of microwave-induced giant magnetoresistance oscillations." JETP Letters 88, no. 9 (2008): 616–19. http://dx.doi.org/10.1134/s0021364008210157.

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Greiner, P., L. Polignone, C. R. Becker, and R. Geick. "Contactless measurement of the conductivity of II?VI epitaxial layers by means of the partially filled waveguide method." Applied Physics A Solids and Surfaces 55, no. 3 (1992): 279–88. http://dx.doi.org/10.1007/bf00348398.

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Awang, Zaiki, Deepak Kumar Ghodgaonkar, and Noor Hasimah Baba. "Free Space Microwave Characterization of Silicon Wafers for Microelectronic Applications." Scientific Research Journal 2, no. 2 (2005): 35. http://dx.doi.org/10.24191/srj.v2i2.9331.

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A contactless and non-destructive microwave method has been developed to characterize silicon semiconductor wafers from reflection and transmission measurements made at normal incidence using MNDT. The measurement system consists of a pair of spot-focusing horn lens antenna, mode transitions, coaxial cables and a vector network analyzer (VNA). In this method, the free-space reflection and transmission coefficients, S11 and S21 are measured for silicon wafers sandwiched between two Teflon plates of 5mm thickness which act as a quarter-wave transformer at mid-band. The actual reflection and tran

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45

Mito, M., H. Matsui, T. Yoshida, et al. "Contactless electrical conductivity measurement of metallic submicron-grain material: Application to the study of aluminum with severe plastic deformation." Review of Scientific Instruments 87, no. 5 (2016): 053905. http://dx.doi.org/10.1063/1.4950868.

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Íñiguez, J., V. Raposo, and Pablo Hernández-Gómez. "Study of Inhomogeneities in Non-Magnetic Tubes by Means of a Contactless Inductive Technique." Materials Science Forum 587-588 (June 2008): 258–62. http://dx.doi.org/10.4028/www.scientific.net/msf.587-588.258.

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An accurate technique for contact-less measurement of resistivity in non-magnetic conductive tubes has been developed. It is intended for application in non-destructive testing (NDT) in tube manufacturing by simple study of the induced currents. Inhomogeneities or minimal imperfections in the tube thickness are immediately detected. This measuring technique is also suitable for determining the thickness of very thin metal coatings on non-conductive tubes. The experimental setup corresponds to an electrical transformer, the tube being the core. A first coil is placed around the tube under test,

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Wu, Yongkang, Baoping Lu, Wei Zhang, Yandan Jiang, Baoliang Wang, and Zhiyao Huang. "A New Logging-While-Drilling Method for Resistivity Measurement in Oil-Based Mud." Sensors 20, no. 4 (2020): 1075. http://dx.doi.org/10.3390/s20041075.

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Resistivity logging is an important technique for identifying and estimating reservoirs. Oil-based mud (OBM) can improve drilling efficiency and decrease operation risks, and has been widely used in the well logging field. However, the non-conductive OBM makes the traditional logging-while-drilling (LWD) method with low frequency ineffective. In this work, a new oil-based LWD method is proposed by combining the capacitively coupled contactless conductivity detection (C4D) technique and the inductive coupling principle. The C4D technique is to overcome the electrical insulation problem of the O

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Collins, David A., Ekaterina P. Nesterenko, Dermot Brabazon, and Brett Paull. "In-process phase growth measurement technique in the fabrication of monolithic porous layer open tubular (monoPLOT) columns using capacitively coupled contactless conductivity." Analyst 138, no. 9 (2013): 2540. http://dx.doi.org/10.1039/c3an00133d.

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Mito, Masaki, Keisuke Shibayama, Hiroyuki Deguchi, et al. "Contactless measurement of electrical conductivity for bulk nanostructured silver prepared by high-pressure torsion: A study of the dissipation process of giant strain." Journal of Applied Physics 122, no. 12 (2017): 125105. http://dx.doi.org/10.1063/1.4991430.

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Duong, Hong Anh, Thanh Dam Nguyen, Thanh Duc Mai, Jorge Sáiz, and Hung Viet Pham. "Inexpensive and versatile measurement tools using purpose-made capillary electrophoresis devices coupled with contactless conductivity detection: A view from the case study in Vietnam." Journal of Science: Advanced Materials and Devices 1, no. 3 (2016): 273–81. http://dx.doi.org/10.1016/j.jsamd.2016.08.003.

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