In this article, temperature dependent
refractive index of liquid crystals: 4-n alkyl benzoic
acids ( nBA, where n = 6,8) are investigated towards the
thermometry applications. Here the technique of image
analysis in conjunction with Optical Polarizing
Microscope is used to compute the refractive index of
liquid crystals. This technique involves the computation
of optical transmission, Absorption coefficient and
reflectance from the liquid crystal textures. These
parameters are determined from the intensities of the
liquid crystal textures as a function of temperature.
MATLAB software is used for the purpose of
parameters computation from the textures of liquid
crystals. The obtained results show that compound
with n = 8 is more suitable for various thermometric
applications than compound with n = 6 because it has
been associated with strong variations in the refractive
index values temperature.
Keywords : Refractive Index, Textures, Image Analysis, Transmission, Reflectance and Absorption Coefficient.