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A Transient Technique for Calibrating Thermochromic Liquid Crystals: The Effects of Surface Preparation, Lighting and Overheat

[+] Author Affiliations
Smitesh Bakrania, Ann M. Anderson

Union College, Schenectady, NY

Paper No. IMECE2002-33092, pp. 445-451; 7 pages
doi:10.1115/IMECE2002-33092
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 7
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3638-X | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

This paper describes a transient technique for thermochromic liquid crystal hue-temperature calibration and presents results on the effects of surface preparation, lighting and overheat on that calibration. An image acquisition system and calibration test plate were designed for transient measurement and are described. The transient calibration results compare well to steady state calibration results for cooling and heating rates of 0.03 °C/s. Hysteresis occurred when the surface was heated above the play range of the crystals but was not permanent. We found that a poorly prepared liquid crystal surface yielded a “steep” calibration curve, was subject to light ‘warm up’ effects and the hysteresis effect was severe upon overheating.

Copyright © 2002 by ASME

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