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사각관 이상유동 분석을 위한 전기적 캐패시턴스 토모그라피 코드 개발
Development of an Electrical Capacitance Tomography Code for Analysis of Two-Phase Flow in the Rectangular Pipe

이경황   (한동대학교 대학원 기계제어시스템공학부UU0001484  ); 이재영   (한동대학교 기계제어시스템공학부UU0001484  );
  • 초록

    A computer code for Electrical Capacitance Tomography (ECT) is developed to sense the cross sectional phase distribution of two-phase flow in the rectangular pipe in which the tomography sensor furnished by the insulated wall, electrodes, and electric field screen. The computer code had two steps for the image reconstruction. In the forward projection step, the sensitivity matrix was constructed based on the electric field calculated by the finite difference method. In the backward projection step, the sensitivity matrix and the measured capacitances were used to reconstruct the cross sectional image. Several algorithms including LBP, TR, ITR, and PLI were employed to find the proper one for the two-phase flow analysis. Since the dielectric constant of the water in two-phase flow is sensitive to the thermal parameter such as, temperature and pressure, the developed code was evaluated to find their accuracy, speed of calculation, and sensitivity to the variation of the dielectric constant. It was found that the iterative methods are superior to the direct methods for the image reconstruction, and the PLI method was the best in the variation of the dielectric constants.


  • 주제어

    전기적 캐패시턴스 토모그라피 .   이미지 복원 .   역전사 알고리즘 .   이상유동.  

  • 참고문헌 (16)

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    2. Williams, R.A. and Beck, M.S., 1995, 'Process Tomography, Principles, Techniques & Applications,' Butterworth-Heinemann Ltd. 
    3. Park, M.C. and Lee, J.Y., 'Development of Capacitive Probe for Local Flow Parameter of Two Phase Flow' KNS spring meeting, 2004, Gyung Ju, Korea 
    4. Huang, S.M., Xie, C.G., Thorn, R., Snowden, D. and Beck, M.S., 1992, 'Design of Sensor Electronics for Electrical Capacitance Tomography,' lEE proc. G, Vol. 139, pp. 83-88 
    5. Yang, W.Q. and York, T.A., 1999, 'New A.C. Based Capacitance Tomography System,' IEE Sci. Meas. Technol. Vol. 146, pp. 47-53 
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    7. Mwamblea, A.J., Isaksen and Johansen, G.A., 1997, 'The Use of Entropic Thresholding Methods in Reconstruction of Capacitance Tomography Data,' Chem. Eng. Sci. Vol. 52, pp. 2149-2159 
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    9. Peng, L.H., Merkus, H. and Scarlett, B., 2000, 'Using Regularization Methods for Image Reconstruction of Electrical Capacitance Tomography,' Part. Part. Syst. Charact., Vol. 17, pp. 96-104 
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    11. Yang, W.Q., Spink, D.M., York, T.A. and McCann, H., 1999. 'An Image-Reconstruction Algorithm Based on Landweber's Iteration Method for Electrical Capaictance Tomography,' Meas. Sci. Technol., Vol. 14, pp. 1065-1069 
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    14. Hanssen, P.C., 1998, 'Rank-Deficient and Discrete III-posed Problems,' Philadelphia, PA: SIAM 
    15. Yang, W.Q. and Peng, L., 2003, 'Image Reconstruction Algorithms for Electrical Capacitance Tomography,' Meas. Sci. Technol., Vol. 14, pp. R1-R13 
    16. Yang, W.Q. and Liu, S., 1999, 'Electrical Capacitance Tomography with a Square Sensor,' 1st world congress on Industrial process tomography., Session H1: Hardware, pp. 313-317 

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