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Abstract
Optical microfiber-based temperature sensors have been proposed for many applications in a variety of industrial uses, including biomedical, geological, automotive, and defense applications. This increasing demand for these micrometric devices is attributed to their large dynamic range, high sensitivity, fast-response, compactness and robustness. Additionally, they can perform in-situ measurements remotely and in harsh environments. This paper presents an overview of optical microfibers, with a focus on their applications in temperature sensing. This review broadly divides microfiber-based temperature sensors into two categories: resonant and non-resonant microfiber sensors. While the former includes microfiber loop, knot and coil resonators, the latter comprises sensors based on functionally coated/doped microfibers, microfiber couplers, optical gratings and interferometers. In the conclusions, a summary of reported performances is presented.
Highlights
According to the grating period, the MF gratings (MFG) are categorized into two types which are MF Bragg grating (MFBG) and MF long period grating (LPG)
A variety of temperature sensors based on micro/nanofibers have been proposed and experimentally demonstrated
Benefitting from their small sizes, excellent optical confinement, high-fractional evanescent fields, bend insensitivity, and possibility to be made into resonators, MFs based temperature sensors have shown special advantages over conventional optical fiber sensors, including a very fast response time
Summary
RReeaall ttiimmee MMFF wwaaiisstt ddiiaammeetteerr mmoonniittoorriinngg wwiitthh uullttrraahhiigghh aaccccuurraaccyy aanndd pprreecciissiioonn wwaass aacchhiieevveedd dduurriinngg ppuulllliinngg bbyy cchheecckkiinngg tthhee eexxcciitteedd hhiigghh--oorrddeerr mmooddeess iinn aa SSMMFF2288ee ffiibbeerr ccoouupplleedd ttoo aa CCWW llaasseerr ototooppsseeuurraaddttddiinneeggnnaattttrraaλλnn~~ssmm7788ii5ss5ssnniioommnn.. The mode is confined by the cladding/air interface and reveals the maximum confinement (D), which makes this ar3e.aMinFtSeernesotirnPgrofoprerntioens linear applications and corresponds to MF diameters around 1 μm for silica in airO. Bio-detectors based on MF are frequently coated with functionalizing materials (polymers, resins) which can selectively bind chemicals This will induce an enhancement in the sensor specificity and sensitivity to select substances. Sensors performance is usually quantified by several parameters, which include: sensitivity, resoluStieonns,odrsetpecetrifoonrmlimanitc,ereisspuosnusaelltyimqeu,arnetpiefiaetdabbilyityseavnedraolppearraatimngetrearsn,gwe.hich include: sensitivity, resolution, detection limit, response time, repeatability and operating range
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