Available under a Creative Commons Attribution Non-Commercial Share Alike 4.0 International Licence
Electrical and electronic engineering
A fibre-optic strain sensor based on a gourd-shaped joint multimode fibre (MMF) sandwiched between two single-mode fibres (SMFs) is described both theoretically and experimentally. The cladding layers of the two MMFs are reshaped to form a hemisphere using an electrical arc method and spliced together, yielding the required gourd shape. The gourd-shaped section forms a Fabry-Perot cavity between the ends of two adjacent but noncontacting multimode fibres’ core. The effectiveness of the multimode interference based on the Fabry-Perot interferometer (FPI) formed within the multimode inter-fibre section is greatly improved resulting in an experimentally determined strain sensitivity of −2.60 pm/με over the range 0—1000 με. The sensing characteristics for temperature and humidity of this optical fibre strain sensor are also investigated.
Tian, K. et al (2017). Strain sensor based on gourd-shaped single-mode-multimode-single-mode hybrid optical fibre structure. Optics Express, vol. 25, no. 16, pg. 18885. doi:10.1364/OE.25.018885