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TECHNICAL NOTES

A Novel Mini Calibrator for Thermochromic Liquid Crystals

[+] Author and Article Information
Christopher J. Elkins

Mechanical Engineering Department, Building 500, Stanford University, Stanford, CA 94305 e-mail: belkins@vk.stanford.edu

John Fessler

Exponent, 149 Commonwealth Drive, Menlo Park, CA 94025 e-mail: jfessler@exponent.com

John K. Eaton

Mechanical Engineering Department, Building 500, Stanford University, Stanford, CA 94305 e-mail: eaton@vk.stanford.edu

J. Heat Transfer 123(3), 604-607 (Nov 21, 2000) (4 pages) doi:10.1115/1.1370505 History: Received December 14, 1999; Revised November 21, 2000
Copyright © 2001 by ASME
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References

Cooper,  T. E., Field,  R. J., and Meyer,  J. F., 1975, “Liquid Crystal Thermography and Its Application of the Study of Convective Heat Transfer,” ASME J. Heat Transfer, 97, pp. 442–405.
Simonich,  J. C., and Moffat,  R. J., 1982, “New Technique for Mapping Heat Transfer Coefficient Contours,” Rev. Sci. Instrum., 53, pp. 678–683.
Hippensteele, S. A., Russell, L. M., and Torres, F. J., 1986, “Use of a Liquid-Crystal and Heater-Element Composite for Quantitative, High-Resolution Heat Transfer Coefficients on a Turbine Airfoil Including Turbulence and Surface-Roughness Effects,” Pressure and Temperature Measurements, J. H. Kim and R. J. Moffat, eds., ASME HTD Vol. 58, pp. 105–120.
Jones, T. V., and Hippensteele, S. A., 1987, “High-Resolution Heat-Transfer-Coefficient Maps Applicable to Compound-Curve Surfaces Using Liquid Crystals in a Transient Wind Tunnel,” Developments in Experimental Techniques in Heat Transfer and Combustion, R. O. Harrington, ed., ASME HTD Vol. 71, pp. 1–9.
Abuaf,  N., and Kercher,  D. M., 1994, “Heat Transfer and Turbulence in a Turbulated Blade Cooling Circuit,” ASME J. Turbomach., 116, pp. 169–177.
Van Treuren,  K. W., Wang,  Z., Ireland,  P. T., and Jones,  T. V., 1994, “Detailed Measurements of Local Heat Transfer Coefficient and Adiabatic Wall Temperature Beneath and Array of Impinging Jets,” ASME J. Turbomach., 116, pp. 369–374.
Hollingsworth, D. K., Boehman, A. L., Smith, E. G., and Moffat, R. J., 1989, “Measurements of Temperature and Heat Transfer Coefficient Distributions in a Complex Flow Using Liquid Crystal Thermography and True-Color Image Processing,” ASME Collected Papers in Heat Transfer, pp. 35–42.
Dabiri,  D., and Gharib,  M., 1991, “Digital Particle Image Thermometry: The Method and Implementation,” Exp. Fluids, 11, pp. 77–86.
Camci,  C., Kim,  K., and Hippensteele,  S. A., 1992, “A New Hue Capturing Technique For The Quantitative Interpretation of Liquid Crystal Images Used In Convective Heat Transfer Studies,” ASME J. Turbomach., 114, pp. 765–775.
Wang, Z., Ireland, P. T., Jones, T. V., and Davenport, R., 1994, “A Color Image Processing System for Transient Liquid Crystal Heat Transfer Experiments,” ASME Paper No. 94-GT-290.
Farina, D. J., Hacker, J. M., Moffat, R. J., and Eaton, J. K., 1993, “Illuminant Invariant Calibration of Thermochromic Liquid Crystals,” J. J. Simonean and B. F. Armaly, eds., ASME HTD, Vol. 252, pp. 1–11.
Baughn, J. W., Anderson, M. R., Mayhew, J. E., and Wolf, J. D., 1999, “Hysteresis and Uncertainty of Thermochromic Liquid Crystal Temperature Measurement Based on Hue,” Proceedings of the 5th ASME/JSME Joint Thermal Engineering Conference, March 15–19, 1999, San Diego, CA, paper no. AJTE99/6294.

Figures

Grahic Jump Location
Illustration showing the assembly of the mini calibrator
Grahic Jump Location
Mini calibrator power circuit
Grahic Jump Location
Time response of the mini calibrator to a 0.5°C step
Grahic Jump Location
The calibration data and interpolated look up table values for a 25C5W liquid crystal sample

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