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Errors in thermochromic liquid crystal thermometry
KTH, Superseded Departments, Mechanics.
2004 (English)In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 75, no 9, 2985-2994 p.Article in journal (Refereed) Published
Abstract [en]

This article experimentally investigates and assesses the errors that may be incurred in the hue-based thermochromic liquid crystal thermochromic liquid crystal (TLC) method, and their causes. The errors include response time, hysteresis, aging, surrounding illumination disturbance, direct illumination and viewing angle, amount of light into the camera, TLC thickness, digital resolution of the image conversion system, and measurement noise. Some of the main conclusions are that: (1) The 3 X 8 bits digital representation of the red green and blue TLC color values produces a temperature measurement error of typically 1% of the TLC effective temperature range, (2) an eight-fold variation of the light intensity into the camera produced variations, which were not discernable from the digital resolution error, (3) this temperature depends on the TLC film thickness, and (4) thicker films are less susceptible to aging and thickness nonuniformities. (C) 2004 American Institute of Physics.

Place, publisher, year, edition, pages
2004. Vol. 75, no 9, 2985-2994 p.
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-40922DOI: 10.1063/1.1777406ISI: 000224754800032ScopusID: 2-s2.0-7544239452OAI: diva2:443266
QC 20110923Available from: 2011-09-23 Created: 2011-09-23 Last updated: 2011-09-23Bibliographically approved

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