Tilted Bragg grating in a glycerol-infiltrated specialty optical fiber for temperature and strain measurements.
Opt Lett
; 49(11): 2869-2872, 2024 Jun 01.
Article
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| ID: mdl-38824279
ABSTRACT
In this Letter, we propose an in-line tilted fiber Bragg grating sensor for temperature and strain measurements. The grating is inscribed in a specialty optical fiber using tightly focused femtosecond laser pulses and the line-by-line direct writing method. Beside the central core in which the grating is produced, a hollow channel filled with glycerol aqueous solution significantly improves the sensitivity of the fiber cladding modes due to its high thermo-optic coefficient. We show that the temperature sensitivity of the core mode is 9.8â
pm/°C, while the one of the cladding modes is strongly altered and can reach -24.3â
pm/°C, in the investigated range of 20-40°C. For the strain measurement, sensitivities of the core mode and the cladding modes are similar (â¼0.60â
pm/µÎµ) between 0 and 2400â
µÎµ. The significative difference of temperature sensitivity between the two modes facilitates the discrimination of the dual parameters in simultaneous measurements.
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2024
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