Thermo-optic coefficient
The thermo-optic coefficient of a material is the change in refractive index with the response to temperature. This value itself also depends on the present temperature of the material and so has second-order behaviours. At low temperatures (0-400°C), the relationship is linear but at higher ones it exhibits a second-order polynomial behaviour.[1]
Applications
[edit]The relationship can be used in temperature measurement by Fibre Bragg gratings (FBGs) where if no physical strain is applied, a Bragg's Wavelength shift of 1 pm per 0.1°C temperature change can be measured.
References
[edit]- ^ Wang, Wenyuan (May 17, 2015). Measurements of thermo-optic coefficient of standard single-mode fiber under large temperature range. 2015 International Conference on Optical Instruments and Technology: Optical Sensors and Applications. doi:10.1117/12.2193091.