Abstract
Sensing performances of evanescent field absorption (EFA) hetero-core fiber sensor has been presented based on EFA by changing the length and the core diameter of the single mode fiber. Experimental results have demonstrated a good feature in their relationship between the length and the core diameter of the single mode fiber. The sensor consists of 2 fiber optics which have the same cladding diameter of <TEX>$125{\mu}m$</TEX> However one fiber optic used is single mode and has varying core diameter ranging from 3.3 to <TEX>$5.6{\mu}m$</TEX>. The other fiber is multimode type and has a thicker fixed core diameter of <TEX>$62.5{\mu}m$</TEX>. The 2 fiber optics are thermally spliced together. Experiments conducted to measure the resonance wavelength were carried out over a range of refractive index, to find the optimum sensing length Experiments show that core diameter of the single mode fiber and sensing length offects the linearity and sensitivity.
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