Polymer optical fiber specklegram strain sensor with extended dynamic range

Fujiwara, Eric; Silva, Luiz Evaristo da; Marques, Thiago H. R.; Cordeiro, Cristiano M. B.

doi:10.1117/1.oe.57.11.116107

Cited by 41 publications

(24 citation statements)

References 42 publications

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“…A fluid sample (water or acetone) is dripped on the 2% w/v agar fibre excited with HeNe laser, whereas the output speckle field is monitored during 1 min by a CCD camera. Subtle variations in acquired images are quantified with the extended zero-mean normalized cross-correlation (EZNCC) coefficient, providing a sensitive metric for investigating changes in the fibre status 27 . The EZNCC signals decrease due to the fact that agarose may experience volume changes by swelling, dehydration, and syneresis depending on the fluid 28 , which affect the fibre geometry and light guiding conditions, and cause spatiotemporal variations in the speckle patterns.…”

Section: Resultsmentioning

confidence: 99%

“…Volume changes in agar structure lead to deviations in light-guiding conditions, which affects the spatiotemporal configuration of I(x,y) 37 . A sensitive, non-saturating metric for speckle field monitoring is the extended zero-mean normalized cross-correlation function, Z 0 is a cumulative offset, I 0 is the speckle distribution for a reference fibre status, and the overlines indicate average values 27 . The acquired data are processed by routines developed in MATLAB (Mathworks) that convert…”

Section: Methodsmentioning

confidence: 99%

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Agarose-based structured optical fibre

Fujiwara

Cabral

Sato

et al. 2020

Sci Rep

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Biocompatible and resorbable optical fibres emerge as promising technologies for in vivo applications like imaging, light delivery for phototherapy and optogenetics, and localised drug-delivery, as well as for biochemical sensing, wherein the probe can be implanted and then completely absorbed by the organism. Biodegradable waveguides based on glasses, hydrogels, and silk have been reported, but most of these devices rely on complex fabrication procedures. In this sense, this paper proposes a novel structured optical fibre made of agarose, a transparent, edible material used in culture media and tissue engineering. The fibre is obtained by pouring food-grade agar into a mould with stacked rods, forming a solid core surrounded by air holes in which the refractive index and fibre geometry can be tailored by choosing the agarose solution composition and mould design, respectively. Besides exhibiting practical transmittance at 633 nm in relation to other hydrogel waveguides, the fibre is also validated for chemical sensing either by detecting volume changes due to agar swelling/dehydration or modulating the transmitted light by inserting fluids into the air holes. Therefore, the proposed agarosebased structured optical fibre is an easy-to-fabricate, versatile technology with possible applications for medical imaging and in vivo biochemical sensing.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Agarose-based structured optical fibre

Fujiwara

Cabral

Sato

et al. 2020

Sci Rep

Self Cite

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“…Speckle-based POF sensors have been developed to monitor pressure in petrol pipes [ 45 ], to measure the temperature at the surface of a metal plate [ 46 ], or to quantify strain [ 47 ]. For instance, researchers have reported on speckle analysis to monitor the vital signs of patients [ 48 , 49 ] and its use in combination with FBGs to measure strain [ 50 ].…”

Section: Turbine Engine Measurementsmentioning

confidence: 99%

Sensing Applications in Aircrafts Using Polymer Optical Fibres

Lallana

Aldabaldetreku

López

et al. 2021

Sensors

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We report on recent advances in the use of inexpensive polymer optical fibres (POFs) for sensing applications in avionics. The sensors analysed in this manuscript take advantage of the unique properties of polymers, such as high flexibility, elasticity, and sensitivity, and they range from strain, elongation, and vibration interrogators to level and temperature meters, leading to cost-effective techniques for structural health monitoring in aircraft structures. We also highlight recent power-supply methods using Power-over-POF in order to feed sensors remotely, and we discuss the constraints imposed by connectors on the performance of POF networks in aircrafts.

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“…Their main advantages are the smaller water absorption, less brittle nature, easier moldability, smaller birefringence, higher chemical and thermal stability 30 , and higher transmittance in specific frequency ranges, like the THz [30][31][32] . Zeonex is also thermally compatible with PMMA making it possible to draw fibers formed of both materials 33 . In this work, Zeonex 480 R grade commercially available 34 pellets were used.…”

Section: Polymeric Materials: Zeonex and Functionalized Absmentioning

confidence: 99%

Ultra-simplified Single-Step Fabrication of Microstructured Optical Fiber

Cordeiro

Ebendorff‐Heidepriem

2020

Sci Rep

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Manufacturing optical fibers with a microstructured cross-section relies on the production of a fiber preform in a multiple-stage procedure, and drawing of the preform to fiber. These processes encompass the use of several dedicated and sophisticated equipment, including a fiber drawing tower. Here we demonstrate the use of a commercial table-top low-cost filament extruder to produce optical fibers with complex microstructure in a single step-from the pellets of the optical material directly to the final fiber. The process does not include the use of an optical fiber drawing tower and is time, electrical power, and floor space efficient. Different fiber geometries (hexagonal-lattice solid core, suspended core and hollow core) were successfully fabricated and their geometries evaluated. Air guidance in a wavelength range where the fiber material is opaque was shown in the hollow core fiber.

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Polymer optical fiber specklegram strain sensor with extended dynamic range

Abstract: Mais informações no site da editora / Further information on publisher's website: https://www.spiedigitallibrary.org/journals/optical-engineering/volume-57/issue-11/116107/Polymer-optical-fiber-specklegram-strain-sensor-with-extended-dynamic-

Cited by 41 publications

References 42 publications

Agarose-based structured optical fibre

Agarose-based structured optical fibre

Sensing Applications in Aircrafts Using Polymer Optical Fibres

Ultra-simplified Single-Step Fabrication of Microstructured Optical Fiber

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