Optical fiber sensor for temperature measuring

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Abstract
Simple fiber-optic sensor for temperature measuring, based upon the temperature-dependent bend losses in plastic clad silica optical fibers, is being proposed. The quantity of light energy transmitted along the fiber depends on the numerical aperture of the fiber, i.e. the refractive index difference between the silica core (n1) and the plastic cladding (n0). On the one hand, the refractive index of polymer cladding n0 for plastic clad silica optical fibers exhibits considerably temperature dependence. On the other hand, local aperture in fiber bend region also changes at strong curvature, which reduces the number of guided modes and respectively decreases the transmitted light power. Interaction of these two effects produces great dependence of light output energy on temperature. High sensitivity over a wide temperature range (at least from -20 degree(s)C to +60 degree(s)C) can be obtained.

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