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http://dx.doi.org/10.3795/KSME-B.2007.31.11.918

Improvement of Accuracy in Evaluating Hue Change Time in the Hue Detection Based Transient Liquid Crystals Technique  

Shin, So-Min (한국항공대학교 항공우주 및 기계공학부 대학원)
Jeon, Chang-Soo (한국항공대학교 항공우주 및 기계공학부)
Jung, Yong-Wun (한국항공우주연구원 KHP 개발실)
Kwak, Jae-Su (한국항공대학교 항공우주 및 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.31, no.11, 2007 , pp. 918-925 More about this Journal
Abstract
In this paper, different criteria fur determining hue change time in the hue detection based transient liquid crystals technique were compared. Results showed that methods utilizing threshold of intensity or saturation gave many missing points and quality of the calculated results were strongly depends on the value of threshold. Wider bandwidth in the hue bandwidth method showed better distribution of calculated hue change time, but induced ambiguity in the hue change time. In the time-hue curve fitting method, the distribution of evaluated hue change time was smooth and reasonable, and, by the nature of curve fitting, the noise effect on the hue was successfully considered in calculating of the hue change time. Compared to other methods, it is expected that the time-hue curve fitting method would provide better and accurate hue change time in the hue detection based transient liquid crystals technique.
Keywords
Convective Heat Transfer; Transient Liquid Crystals; Technique; Hue Detection;
Citations & Related Records

Times Cited By SCOPUS : 1
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1 Ekkad, S. V. and Han, J. C., 2000, 'A Transient Liquid Crystal Thermography Technique for Gas Turbine Heat Transfer Measurements,' Measurement Science and Technology, Vol. 11, pp. 957-968   DOI   ScienceOn
2 Ireland, P., T., Neely, A., J., Gillespie, D. R.H., and Robertson, A. J., 1999, 'Turbulent Heat Transfer Measurement Using Liquid Crystals,' International Journal of Heat and Fluid Flow, Vol. 20, pp. 355-367   DOI   ScienceOn
3 Baughn, J. W., Anderson, M. R., Mayhew, J. E., and Wolf, J. D., 1999, 'Hysteresis of Thermochromic Liquid Crystals Temperature Measurement on Hue,', Journal Of Heat Transfer, Vol. 121, pp. 1067-1072   DOI
4 Anderson, M. R. and Baughn, J. W., 2004, ' Hjysteresis in Liquid Crystla Thermography,' Journal of Heat Transfer, Vol. 126, pp. 339-346   DOI   ScienceOn
5 Farina, D. J., Hacker, J. M., Moffat, R. J. and Eaton, J. K., 1994, 'Illuminant Invariant Calibration of Thermochromic Liquid Crystlas,' Experimental Thermal and Fluid Science, pp. 1-9   DOI   ScienceOn
6 Chan, R. L., Ashforth-Frost, S. and Jambunathan, K., 2001, 'Calibrating for Viewing Angle Effect During Heat Transfer Measurements on a Curved Surface,' International Journal of Heat and Mass Transfer, Vol. 44, pp. 2209-2223   DOI   ScienceOn
7 Newton, P. J., Yan, Y., Stevens, N. E., Evatt, S. T., LocI, G. D. and Owen, J. M., 2003 'Transient Heat Transfer Measurements using Thermochromic Liquid Crystal. Part 1: An Improved Technique,' International Journal of Heat and Fluid Flow, Vol. 24, pp. 23-28   DOI   ScienceOn
8 Behle, M., Schulz, K., Leiner, W., and Fiebig, M., 1996, 'Color-Based Image Processing to Measure Local Temperature Distributions by Wide-Band Liquid Crystal Thermography,' Applied Scientific Research, Vol. 56, pp.113-143   DOI
9 Camci, C., Kim, K. and Hippensteele, S. A., 1992, 'A New Hue Capturing Technique for The Quantitative Interpretation of Liquid Crystal Images Used III Convective Heat Transfer Studies,' Journal of Turbomachinery, Vol. 114, pp. 765-775   DOI
10 Kingsley-Rowe, J. R., Lock, G. D. and Owen, J. M., 2005, 'Transient Heat Transfer Measurements Using Thermochromic Liquid Crystal: Laterla Conduction Error,' International Journal of Heat and Fluid Flow, Vol. 26, pp. 256-263   DOI   ScienceOn
11 Foley, J. D., Van dam, A., Feiner, S. K., and Hughes, J. F., 1990, 'Computer graphics: Principles and practice,' Addison-Wesley Publishing Company, 2nd Edition
12 Owen, J. M., Newton, P. J., and Lock, G. D., 2003 'Transient Heat Transfer Measurements using Thermochromic Liquid Crystal. Part 2: Experimental Uncertainties,' International Journal of Heat and Fluid Flow, Vol. 24, pp. 23-28   DOI   ScienceOn
13 Baughn, J. W., 1995, 'Liquid Crystal Methods for Studying Turbulent Heat Transfer,' International Journal of Heat and Fluid Flow, Vol. 16, No.5, pp. 365-375   DOI   ScienceOn
14 Ireland, P. T. and Jones, T. V., 2000, 'Liquid Crystal Measurements of Heat Transfer and Surface Shear Stress,' Measurement Science and Technology, Vol. 11, pp. 969-986   DOI   ScienceOn
15 Hocker, R., 1996, 'Optimization of Transient Heat Transfer Measurements usign Thermochromic Liquid Crystlas Based on an Error Estimation,' ASME Paper 96-GT-235