Abstract
A temperature-insensitive strain sensor is proposed and demonstrated based on a dual-core -polymethyl methacrylate (PMMA) taper. Longitudinal and transverse forces on the cores are induced by thermal expansion/contraction of the PMMA cladding due to an order of magnitude difference between the thermal expansion coefficients of and PMMA. At an optimal PMMA layer thickness, the wavelength shift caused by the thermally induced forces on the refractive index of the dual-core fiber cores counterbalances that caused by the thermally induced fiber length variation leading to temperature-insensitive transmission. Temperature-insensitive strain measurement over a temperature range from 30°C to 40°C is demonstrated in a dual-core -PMMA fiber with an core diameter of 0.61 μm and a PMMA cladding diameter of 34.4 μm. Thermally induced forces in hybrid fibers open the path towards the realization of novel sensors and devices that are immune to temperature fluctuations.
© 2018 Optical Society of America
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