Online monitoring of oil film using electrical capacitance tomography and level set method

Xue, Qing; Sun, Bing; Cui, Ziqiang; Ma, Miao; Wang, Huaxiang

doi:10.1063/1.4928060

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…Gauss-Newton) that generates a sequence of level set functions that reduces the residual. For electrical and electromagnetic tomography in particular, some initial studies were conducted using different types of level set techniques for shape reconstruction [16,[20][21][22].…”

Section: (B) Level Set-based Inverse Problemmentioning

confidence: 99%

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Multiphase permittivity imaging using absolute value electrical capacitance tomography data and a level set algorithm

Hosani

Soleimani

2016

Phil. Trans. R. Soc. A.

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Multiphase flow imaging is a very challenging and critical topic in industrial process tomography. In this article, simulation and experimental results of reconstructing the permittivity profile of multiphase material from data collected in electrical capacitance tomography (ECT) are presented. A multiphase narrowband level set algorithm is developed to reconstruct the interfaces between three- or four-phase permittivity values. The level set algorithm is capable of imaging multiphase permittivity by using one set of ECT measurement data, so-called absolute value ECT reconstruction, and this is tested with high-contrast and low-contrast multiphase data. Simulation and experimental results showed the superiority of this algorithm over classical pixel-based image reconstruction methods. The multiphase level set algorithm and absolute ECT reconstruction are presented for the first time, to the best of our knowledge, in this paper and critically evaluated. This article is part of the themed issue 'Supersensing through industrial process tomography'.

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Section: (B) Level Set-based Inverse Problemmentioning

confidence: 99%

“…electrical and electromagnetic tomography in particular, some initial studies were conducted using different types of level set techniques for shape reconstruction [16,[20][21][22]].…”

Section: (B) Level Set-based Inverse Problemmentioning

confidence: 99%

Multiphase permittivity imaging using absolute value electrical capacitance tomography data and a level set algorithm

Hosani

Soleimani

2016

Phil. Trans. R. Soc. A.

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“…As the thickness of such films is usually at micron or sub-micron scales and the films normally located at a closed space, accurate measurement is very difficult to achieve. Until now, there are several techniques available to do this measurement based on the electrical, 1–3 optical, 4,5 or acoustic 6–11 characteristics of the oil film layer. The electrical methods obtain the oil film thickness via the resistance or capacitance of the oil film layer.…”

Section: Introductionmentioning

confidence: 99%

An ultrasonic measurement method for full range of oil film thickness

Zhang

Dou

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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Ultrasonic method is quite promising for oil film thickness measurement in industry, while there is normally a dead zone for one ultrasonic sensor with a special center frequency when measuring the oil film thickness by the traditional reflection coefficient amplitude. In this paper, an ultrasonic measurement method for full range of oil film thickness was investigated. The theoretical relationship between the oil film thickness and the reflection coefficient phase was firstly built up and the reflection coefficient phase was found to be able to measure the oil film thickness in the dead zone. Then the reflection coefficient amplitude and phase were combined to measure the oil film thickness in the full range. A high-precision calibrated rig, which could form a series of known film thicknesses oil layers, was set up and the performance of this method was shown to work well. This method is significant for online oil film thickness monitoring in industry.

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“…Compared with other process tomography techniques, such as ultrasound, optics, X-ray and gamma-ray, it has several advantages, including low cost, rapid response, good portability, radiation-free and good robustness [3], [4]. The ECT technique has been used for parameter measurement and process monitoring for industrial applications, e.g., two-phase flow [5], pneumatic conveying [6], fluidized beds [7], and flame monitoring [8].…”

Section: Introduction Lectrical Capacitance Tomography (Ect) Is Anmentioning

confidence: 99%

A High-Speed Digital Electrical Capacitance Tomography System Combining Digital Recursive Demodulation and Parallel Capacitance Measurement

et al. 2017

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Abstract-Two means can be used to improve the data acquisition rate of the ECT system with a fixed excitation frequency, i.e. improving the capacitance measurement speed or changing the capacitance measurement mode from serial to parallel. This paper presents a newly developed high-speed electrical capacitance tomography (ECT) system by combing digital recursive demodulation and parallel-mode capacitance measurement methods. By using the digital recursive demodulator, the time-cost for one time of capacitance measurement can be one period of the excitation sinusoid or less. By using the parallel-mode capacitance measuring unit, capacitances between the exciting electrode and all other measuring electrodes can be measured simultaneously. The data acquisition rate of the parallel-mode ECT system with a sensor of N electrodes is N-1 times of a traditional serial-mode ECT system with the same excitation frequency. When the excitation frequency is 100 kHz and 0.6 periods of data are used for signal demodulation, the data acquisition rate can reach up to 15150 frames per second. The developed system together with a heat-resisting circular ECT sensor with 12 electrodes was used to monitor the ignition process of a cylindrical flame generated by a Bunsen burner. Experimental results show that the ECT system can locate the position and capture the dynamic process of the flame with a high temporal resolution.

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Online monitoring of oil film using electrical capacitance tomography and level set method

Cited by 7 publications

References 16 publications

Multiphase permittivity imaging using absolute value electrical capacitance tomography data and a level set algorithm

Multiphase permittivity imaging using absolute value electrical capacitance tomography data and a level set algorithm

An ultrasonic measurement method for full range of oil film thickness

A High-Speed Digital Electrical Capacitance Tomography System Combining Digital Recursive Demodulation and Parallel Capacitance Measurement

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