I. M. Nascimento, C. Gouveia, Surnimal Jana, S. Bera, J. Baptista, Paulo Moreira, Palas Biwas, S. Bandyopadhyay, P. Jorge
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High refractive index and temperature sensitivity LPGs for high temperature operation
A fiber optic sensor for high sensitivity refractive index and temperature measurement able to withstand temperature up to 450 °C is reported. Two identical LPG gratings were fabricated, whereas one was coated with a high refractive index (~1.78) sol-gel thin film in order to increase its sensitivity to the external refractive index. The two sensors were characterized and compared in refractive index and temperature. Sensitivities of 1063 nm/RIU (1.338 – 1.348) and 260 pm/°C were achieved for refractive index and temperature, respectively.
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