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]

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Summary

Introduction

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.

Sensor Operation
Theory
Sensor Design and Optimization
Conclusions
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