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Bragg grating-based fiber-optic laser probe for temperature sensing

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6 Author(s)
Mandal, J. ; Sch. of Eng. & Math. Sci., City Univ., London, UK ; Pal, S. ; Tong Sun ; Grattan, K.T.V.
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A novel Bragg grating-based fiber-optic laser probe for temperature sensing using erbium-doped fiber as the active gain medium is reported. The combination of a chirped grating and a normal grating was used to form the laser cavity to achieve temperature-tunable laser action over a wide measurement range. The laser probe used a metal sheath to enhance its mechanical strength and contain the normal grating at the sensing point. The temperature dependence of the wavelength of the laser probe gives a sensitivity of 12.01 pm/°C and a repeatability of ±1.7°C from room temperature to 300°C.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 1 )