Thermal Drifts of Capacitive Flow Meters: Analysis of Effects and Model-Based Compensation

Suppan, Thomas; Neumayer, Markus; Bretterklieber, Thomas; Wegleiter, Hannes

doi:10.1109/tim.2020.3034637

Cited by 12 publications

(9 citation statements)

References 36 publications

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“…In this section a model based temperature compensation approach is presented. Such a technique was originally presented in [44]. In order to develop a model based temperature compensation technique the influence of the temperature on the sensor behaviour has to be understood.…”

Section: Temperature Effects and Compensation Strategymentioning

confidence: 99%

ECT in a large scale industrial pneumatic conveying system

Neumayer,

Bretterklieber,

Suppan

et al. 2024

Meas. Sci. Technol.

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The application of electrical capacitance tomography (ECT) for monitoring of industrial processes has been studied and proposed by many researchers. Examples can be found in monitoring of multiphase flows or mixing processes in reactors. Demonstrations of the functionality based on lab and test rig measurements have proven the potential of the proposed principles. This paper discusses the application of an ECT system in a heavy industries application. The harsh operating conditions in the industrial environment pose several challenges for the application of sophisticated measurement technology. This work addresses key aspects for the application of an ECT measurement system in such an environment. Specifically the electrical system design and the influence of the temperature are addressed. Relevant parameters and possible solutions are discussed. Furthermore the application of ECT as instrument for mass flow metering in pneumatic conveying processes is addressed. Supportive measurement studies from test rig experiments and comparative simulation studies are presented. Therefore, the paper provides a concise discussion on the application of ECT under harsh operating conditions, as well as the use of ECT as a measurement device for process measurement. The work concludes with a presentation of a measurement system in an industrial plant in which the proposed concepts were succesfully implemented.

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Section: Temperature Effects and Compensation Strategymentioning

confidence: 99%

ECT in a large scale industrial pneumatic conveying system

Neumayer,

Bretterklieber,

Suppan

et al. 2024

Meas. Sci. Technol.

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show abstract

“…E.g. as only the block matrix corresponding to X ROI within K « r ð Þ changes, the Schur complement (Strang, 1986) might be used for its solution. We have not investigated this further in this work but want to make a note on it in relation to the choice of equation (3).…”

Section: Comment On the Choice Of The Charge Computationmentioning

confidence: 99%

“…Recent publications present a significant potential for the application of ECT technology for flow monitoring and mass flow metering in pneumatic conveying (Suppan et al, 2021;Suppan et al, 2019Suppan et al, , 2022Neumayer et al, 2019aNeumayer et al, , 2019bNeumayer et al, , 2017. Also, applications in environmental sensing (Bretterklieber et al, 2016;Flatscher et al, 2017Flatscher et al, , 2015 and safety applications have been addressed (Fletcher, 1987).…”

Section: Introductionmentioning

confidence: 99%

Fast numerical techniques for FE simulations in electrical capacitance tomography

Neumayer

Suppan

Bretterklieber

et al. 2023

COMPEL

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Purpose Nonlinear solution approaches for inverse problems require fast simulation techniques for the underlying sensing problem. In this work, the authors investigate finite element (FE) based sensor simulations for the inverse problem of electrical capacitance tomography. Two known computational bottlenecks are the assembly of the FE equation system as well as the computation of the Jacobian. Here, existing computation techniques like adjoint field approaches require additional simulations. This paper aims to present fast numerical techniques for the sensor simulation and computations with the Jacobian matrix. Design/methodology/approach For the FE equation system, a solution strategy based on Green’s functions is derived. Its relation to the solution of a standard FE formulation is discussed. A fast stiffness matrix assembly based on an eigenvector decomposition is shown. Based on the properties of the Green’s functions, Jacobian operations are derived, which allow the computation of matrix vector products with the Jacobian for free, i.e. no additional solves are required. This is demonstrated by a Broyden–Fletcher–Goldfarb–Shanno-based image reconstruction algorithm. Findings MATLAB-based time measurements of the new methods show a significant acceleration for all calculation steps compared to reference implementations with standard methods. E.g. for the Jacobian operations, improvement factors of well over 100 could be found. Originality/value The paper shows new methods for solving known computational tasks for solving inverse problems. A particular advantage is the coherent derivation and elaboration of the results. The approaches can also be applicable to other inverse problems.

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“…Similarly, the devices showing nonlinear responses to temperature have more than one temperaturedependent parameter. Some of the recent literature has demonstrated this issue in atomic force microscopy [2], capacitive displacement probes [3], capacitive flow meters [4], and nuclear reactors [5]. In [6], the paper discusses some photonic crystal fibers and few-mode fibers to design a temperature sensor.…”

Section: Introductionmentioning

confidence: 99%

Amplitude modulated feed-forward thermal drift compensation for linear and nonlinear current sensors

Ranasingh

Pradhan

Raju

2023

Meas. Sci. Technol.

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The linear and nonlinear temperature responses restrict the application of Hall current sensors operating in thermal power plants and industries. The rise in temperature of electron device-based measurement causes a significant error, leading to undesirable consequences for plant operation and relay coordination. This paper investigates four Hall current sensor types with linear and nonlinear temperature responses. The Hall current sensor, which receives the magnetic excitation from the permanent magnet, exhibits a linear temperature response, and the wire-wound design exhibits a nonlinear temperature response in the temperature range of 306-376K. The solution scheme with amplitude modulation and thermal sensor integration with interdigitated electrode design having graphene and ZnO- KMnO4 compounds as the dielectric is also proposed. The use of amplitude modulation achieves input frequency immunity with a 0.03%/K improvement in the temperature response of the capacitive thermal sensor. Experimental observations confirm the validity of the thermal drift compensation scheme with a 20-99% reduction of thermal drift error with a suitable choice of a thermal sensor.

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Thermal Drifts of Capacitive Flow Meters: Analysis of Effects and Model-Based Compensation

Cited by 12 publications

References 36 publications

ECT in a large scale industrial pneumatic conveying system

ECT in a large scale industrial pneumatic conveying system

Fast numerical techniques for FE simulations in electrical capacitance tomography

Amplitude modulated feed-forward thermal drift compensation for linear and nonlinear current sensors

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