A Measurement Compensation Method for Electrical Capacitance Tomography Sensors with Inhomogeneous Electrode Parameters

Round 1

Reviewer 1 Report

The paper contains new items on the subject. The results presents some improvements respect other precedent studies. Moreover some new aspects are reported. The applicability of the method is real. In order to increase the interest of the reader I suggest to remark the possibility of using micro systems of that proposed for flow measurements in microfluidics, It is therefore suggested to view the following contribution and to cite it:

Experimental study on the slug flow in a serpentine microchannel Authors Fabiana Cairone, Salvina Gagliano, Maide Bucolo Date  2016/9/1 Journal Experimental Thermal and Fluid Science Vol 76 Pages:34-44 Editor: Elsevier Some remarks about could make the paper more appealing for a wider range of readers.  

Author Response

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Reviewer 2 Report

Comments and Suggestions for Authors

 

This article presents and investigates a practically useful method to compensate the measurement results of electrical capacitance tomography (ECT) sensors with inhomogeneous electrode parameters for multiphase fluid object parameter detection in industrial processes.

Article presents an analysis of the source of geometric inhomogeneity of ECT sensors, description of the proposed method of measured value compensation, and verification results obtained using COMSOL Multiphysics. The fundamentals of proposed method and experimental data are detail considered and discussed. The introduction section of the paper proposes a wide enough review on recent methods, techniques and studies of ECT with 31 corresponding references. The last section presents all necessary conclusions.

The reviewer suggests that this paper will be interesting and useful for specialists in the field of electrical capacitance tomography.

This paper can be accepted but after justification or correction of the following aspects and after major revision.

 

In the lines 161-163 it is justifiably declared that “…it can be considered that the distortion coefficient k^D_i,j of the ECT sensor described by equation (8) is a fixed value”.

According to expression (10) k^D_i,j = C^f_i,j/C^f*_i,j = C^e_i,j/C^e*_i,j, where C^e_i,j, C^e*_i,j are actual and corrected set of measurements for empty pipe; C^f_i,j, C^f*_i,j are actual and corrected set of measurements for full pipe.

Consequently, because k^D_i,j is a fixed value, we can write k^D_i,j = C^f_i,j/C^f*_i,j = C^e_i,j/C^e*_i,j = C^m_i,j/C^m*_i,j,

where C^m_i,j, C^m*_i,j are actual and corrected set of measurements for the distribution of a medium that is not empty or full.

Correspondently C^m*_i,j = C^m_i,j/ k^D_i,j.

But according to (11) C^m*_i,j = (C^m_i,jC^e*_i,j)/(k^D_i,jC^e_i,j).

Taking into account the fact that k^D_i,j = C^e_i,j/C^e*_i,j (from expression (10)), expression (11) can be rewritten as

C^m*_i,j = (C^m_i,jC^e*_i,j)/(k^D_i,jC^e_i,j)  = C^m_i,j/(k^D_i,j)², which is not logical.

Please, correct expression (11) and correspondently expression (13) as well as the results in Figures 5-7, or present a more detailed derivation of expression (11) from expression (10).

 

Comments for author File: Comments.pdf

Author Response

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Reviewer 3 Report

1. Define "PEEK"  Electrical engineers would not know this.

2. Why are there dots above P, V, and E. In many texts, this means the derivative.

3. Why the "*" above some parameters?  This usually means complex conjugate, but that does not appear to be true in your paper.

4. The correction factor is dependent on the pipe and sensor dimensions. What happens if the pipe and sensor expand with the fluid flow and temperature changes?

Author Response

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Round 2

Reviewer 2 Report

Comments and Suggestions for Authors

 

Thanks to the authors for the quality revision of the article.

This paper can be accepted in present form.

Comments for author File: Comments.pdf