Abstract
An accurate design of an innovative fiber optic temperature sensor is developed. The sensor is based on a cascade of three microstructured optical fibers (MOFs). In the first one a suitable cascade of long period gratings is designed into the core. A single mode intermediate and a rare-earth activated Fabry-Perot optical cavity are the other two sensor MOF sections. An exhaustive theoretic feasibility investigation is performed employing computer code. The complete set-up for temperature monitoring can be obtained by utilizing only a low cost pump diode laser at 980 nm wavelength and a commercial optical power detector. The simulated sensitivity S = 315.1 μW/°C and the operation range ΔT = 100 °C is good enough for actual applications.
Highlights
IntroductionSeveral innovative temperature optical sensors have been proposed in the literature
During the last decade, several innovative temperature optical sensors have been proposed in the literature
A number of different strategies have been successfully applied in order to obtain feasible and reliable temperature sensing, e.g., by exploiting the temperature dependence of integrated systems and/or single elements based on fiber Bragg gratings (FBGs), long period gratings (LPGs), Fabry-Perot (FP) cavity lasers, Sagnac loops, interferometers, off-set spliced fibers, etc. [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]
Summary
Several innovative temperature optical sensors have been proposed in the literature. An accurate theoretical investigation on the feasibility of an innovative fiber optic temperature sensor, conceived as a standalone device, is performed It is based on a cascade of three integrated/spliced microstructured optical fibers (MOFs). A complete set-up for temperature detection could be obtained by utilizing, in addition to the proposed sensor, only a low cost pump diode laser at 980 nm wavelength and a commercial optical power meter. This kind of optical sensor exhibits all the well-known fiber optic properties, e.g., immunity to electromagnetic noise and compactness, it can be optimized to monitor different temperature ranges via a proper choice of the gratings.
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