Journal ArticleDOI
Temperature sensing with thermochromic liquid crystals
TLDR
A review of the most recent developments in the application of thermochromic liquid crystals to fluid flow temperature measurement is presented in this paper, where the experimental aspects including application, illumination, recording, and calibration of liquid crystals on solid surfaces, as well as in fluid suspensions, are discussed.Abstract:
A review of the most recent developments in the application of thermochromic liquid crystals to fluid flow temperature measurement is presented. The experimental aspects including application, illumination, recording, and calibration of liquid crystals on solid surfaces, as well as in fluid suspensions, are discussed. Because of the anisotropic optical properties of liquid crystals, on-axis lighting/viewing arrangements, combined with in-situ calibration techniques, generally provide the most accurate temperature assessments. However, where on-axis viewing is not possible, calibration techniques can be employed, which reduce the uncertainty associated with off-axis viewing and lighting arrangements. It has been determined that the use of hue definitions that display a linear trend across the color spectrum yield the most accurate correlation with temperature. The uncertainty of both wide-band and narrow-band thermochromic liquid crystal calibration techniques can be increased due to hysteresis effects, which occur when the temperature of the liquid crystals exceeds their maximum activation temperature. Although liquid crystals are commonly used to provide time-mean temperature measurements, techniques are available which allow the monitoring of temporal changes. Selected examples illustrating the use of thermochromic liquid crystals are shown, and a survey of reported temperature measurement uncertainties is presented.read more
Citations
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Cholesteric Liquid Crystals with a Broad Light Reflection Band
TL;DR: Novel cholesteric-liquid-crystalline architectures with the related fabrication procedures must be developed to broaden the bandwidth around a central reflection wavelength, do without the polarization-selectivity rule and go beyond the reflectance limit.
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Cholesteric liquid crystals in living matter
TL;DR: The consequences of the cholesteric geometry in living matter are described, which are far from being fully defined and understood, and discusses various perspectives.
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A review on various temperature-indication methods for Li-ion batteries
L.H.J. Raijmakers,L.H.J. Raijmakers,DL Dmitry Danilov,DL Dmitry Danilov,Rüdiger-A. Eichel,Rüdiger-A. Eichel,Peter H. L. Notten,Peter H. L. Notten,Peter H. L. Notten +8 more
TL;DR: This review gives a comprehensive overview of various temperature measurement methods that can be used for temperature indication of Li-ion batteries.
Journal ArticleDOI
Temperature measurement techniques for gas and liquid flows using thermographic phosphor tracer particles
TL;DR: In this article, a review of temperature measurement techniques for fluid flows that are based on thermographic phosphors, which are materials that possess temperature-dependent luminescence properties, is presented.
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Digital particle image thermometry/velocimetry: a review
TL;DR: Digital particle image thermometry/velocimetry (DPIT/V) is a relatively new methodology that allows for measurements of simultaneous temperature and velocity within a two-dimensional domain this article.
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