Title :
Strain-Temperature Discrimination Using Multimode Interference in Tapered Fiber
Author :
Andre, R.M. ; Biazoli, Claudecir R. ; Silva, S.O. ; Marques, M.B. ; Cordeiro, Cristiano M. B. ; Frazao, Orlando
Author_Institution :
Dept. de Fis. e Astron., Univ. do Porto, Porto, Portugal
Abstract :
Tapering single-mode-multimode-single-mode structures to enhance sensitivity is proposed and experimentally demonstrated. 50-mm-long coreless multimode fiber sections are spliced between single-mode fibers (SMFs) and tapered. They are characterized in strain, and an increase in strain sensitivity is obtained with taper diameter reduction. Sensitivities as high as -23.69pm/με for the 15-μm taper are attained. Temperature sensitivities also depend on taper diameter. A combination of two different diameter tapered SMF MMF-SMF structures, with cross-sensitivity to strain and temperature, is proposed as a sensing system for the simultaneous measurement of strain and temperature with resolutions of ±5.6 με and ±1.6°C, respectively. A good condition number of 3.16 is achieved with this sensing structure.
Keywords :
fibre optic sensors; light interference; optical fibre fabrication; splicing; strain measurement; strain sensors; temperature measurement; temperature sensors; coreless multimode fiber sections; multimode interference; sensing structure; sensing system; single-mode fibers; single-mode-multimode-single-mode structures; size 15 mum; size 50 mm; strain measurement; strain sensitivity; strain-temperature discrimination; taper diameter reduction; tapered SMF MMF-SMF structures; tapered fiber; temperature measurement; temperature sensitivity; Optical fiber sensors; Optical fibers; Sensitivity; Strain; Temperature measurement; Temperature sensors; Multimode interference devices; optical fiber sensors; optical fiber tapers; strain and temperature measurement;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2230617
