Biosynthesized CuO nanoparticles–coated grating sensors for temperature measurement

Abstract

In the present report we demonstrate temperature sensing using fiber Bragg grating fixed on a Teflon substrate, which has a large thermal expansion coefficient. The significant enhancement in the sensitivity has been achieved by coating the fiber with green synthesized copper oxide nanoparticles characterized by UV-Visible spectroscopy, SEM, DSC and other techniques. The behavior of the coated material is unique in its response to the thermal stability based on mode of coating. We have explored the thermal response of FBG sensor mounted on the temperature unit on and after coating. The designed sensor is compact, cost effective and measures temperatures in the range of 25 0C to 200 0C. It has showed a linear relationship between wavelength shift and temperature change along with 0.59 pm / oC enhancement in the sensitivity. However, by optimizing the materials and physical dimensions of FBG, it is possible to increase the range of temperature detection thereby improving the performance of sensor. It is observed that sensitivity of the nanoparticles- coated FBG is better than that of the bare FBG for all ranges of temperature.