Title :
High Sensitivity of Balloon-Like Bent MMI Fiber Low-Temperature Sensor
Author :
Mohd Noor, M.Y. ; Azmi, A.I. ; Abdullah, A.S. ; Mohd Supa´at, A.S. ; Mohd Kassim, N. ; Ibrahim, M.H. ; Ngajikin, N.H.
Author_Institution :
Fac. of Electr. Eng., Univ. Teknol. Malaysia, Skudai, Malaysia
Abstract :
A novel low cost and simple temperature sensor based on multimode interference (MMI) is formed by a successive singlemode fiber (SMF)-bent multimode fiber (MMF)-SMF structure. Due to the small curvature radius of bent MMF section mimicking a balloon shape, MMI effect from the core is spreading into coating. The high temperature sensitivity is mainly due to the large thermo-optical coefficient of the existing acrylate coating of the MMF fiber. A temperature sensitivity of up to -2060 pm/°C and -25.1 nW/°C for wavelength- and intensity-based interrogation, respectively, have been achieved in the range between 27 °C and 31 °C. This sensor is most suitable in high sensitivity and low-temperature application such as the measurement of human body temperature.
Keywords :
fibre optic sensors; light interference; temperature sensors; acrylate coating; balloon shape; balloon-like bent MMI fiber low-temperature sensor; high temperature sensitivity; multimode interference; small curvature radius; temperature 27 degC to 31 degC; thermo-optical coefficient; Coatings; Optical fiber sensors; Optical fibers; Sensitivity; Temperature measurement; Temperature sensors; Temperature sensing; multimode interference effect; optical fiber sensor;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2448944
