Color theory perception of steady wide band liquid crystal thermometry

A color theory perspective to steady wide-band thermochromic liquid crystals (TLCs) is presented towards application in surface temperature measurements. In this regard, TLC color response experiments are conducted on an ex situ calibration plate under various illuminant spectra, and for a broad range of camera angle and white balance configurations.The findings indicate that by color theory guided application of eligible background image subtraction technique, in conjunction with appropriate camera white balance selection, accurate, illuminant and viewing angle invariant hue-temperature relations can be established. This yields more practical, robust and generalized calibration methodologies. The importance of an adequate processing technique, along with its implications in color theory and consequences on hue-temperature relation is addressed in detail towards applicability in a broad spectrum of experimental arrangements.

► Color theory perception of liquid crystal (LC) thermometry.
► Experiments conducted for various illuminant spectra, camera angle and white balance.
► Wide band LCs under certain illuminant-observer conditions yield narrow band behavior.
► Background subtraction offers light source/orientation invariant, accurate hue curves.
► More practical, robust and generalized LC calibration methodology.