Simultaneous measurement of strain, temperature and refractive index based on multimode interference, fiber tapering and fiber Bragg gratings

Oliveira, Ricardo; Osório, Jonas H.; Aristilde, Stenio; Bilro, Lúcia; Nogueira, Rogério N.; Cordeiro, Cristiano M. B.

doi:10.1088/0957-0233/27/7/075107

Cited by 67 publications

(21 citation statements)

References 21 publications

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“…Another similar example of a three-parameter sensor (strain, RI, and temperature) is reported in Ref. 124, where the sensing structure is composed of three regions ( Fig. 35): (a) a single-mode fiber with inscribed FBG, which is only strain and temperature sensitive, (b) a tapered SMF section with inscribed FBG, which is sensitive to temperature, strain, and RI, and (c) a section of coreless fiber (that defines MZI), which is also sensitive to all three-sensed parameters, but with considerably different spectral sensitivities to all three parameters than the FBG inscribed in the tapered region.…”

Section: Multiparameter Sensors Based On Combinations Of Fbg/lpfbgs Amentioning

confidence: 76%

Multiparameter fiber-optic sensors: a review

2019

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Needs for sensor miniaturization, versatile sensing solutions, and improved measurements' performances in difficult operating environments have recently driven considerable research in optical fiber sensor for multiparameter measurements. Multiparameter sensors not only enable new sensors' functionalities, but can also improve achievable measurement performances for some frequently measured parameters considerably. This study provides a review of work in the field of miniature fiber-optic sensors that allows independent and simultaneous measurements of two or more different physical or chemical parameters. Sensor designs and corresponding signal processing schemes are reviewed and compared.

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Section: Multiparameter Sensors Based On Combinations Of Fbg/lpfbgs Amentioning

confidence: 76%

Multiparameter fiber-optic sensors: a review

2019

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“…A sensitivity of (À140 AE 6) pm/°C was measured. This sensitivity is around 14 times higher than conventional Bragg gratings-based temperature sensors [36].…”

Section: Polymer Capillary Fibers For Temperature Sensingmentioning

confidence: 82%

Minimalist Approach for the Design of Microstructured Optical Fiber Sensors

Osório¹,

Cordeiro²

2019

Applications of Optical Fibers for Sensing

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We report on recent investigations regarding ultra-simplified designs for microstructured optical fiber sensors. This minimalist approach relies on the utilization of capillary-like fibers-namely embedded-core fibers, surface-core fibers, and capillary fibers-as platforms for the realization of sensing measurements. In these fibers, guidance of light is accomplished in an embedded or surface germanium-doped core or in the hollow part of capillaries. External stimuli can alter fiber wall thickness and/or induce birefringence variations, allowing, for the embedded-core and capillary fibers, to operate as pressure or temperature sensors. For the surface-core fiber design, the interaction between the guided mode and external medium allows the realization of refractive index sensing either by using fiber Bragg gratings or surface plasmon resonance phenomenon. Also, we report the realization of directional curvature sensing with surface-core fibers making use of the off-center core position. The attained sensitivities are comparable to the ones obtained with much more sophisticated structures. The results demonstrate that these novel geometries enable a new route toward the simplification of optical fiber sensors.

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“…Indeed, it is not mandatory that the temperature sensitivities in DET 1 and DET 2 are equal. If they are different, similarly to FBG-based multiparameter sensors [23], the temperature and refractive index variations can be estimated by using a linear system in which the refractive index and temperature sensitivities are taken into account.…”

Section: Gasoline Sensing Measurementsmentioning

confidence: 99%

Gasoline Quality Sensor Based on Tilted Fiber Bragg Gratings

2019

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We report on the study of an intensity-based optical fiber sensor for gasoline quality monitoring. The sensor setup employs two Bragg gratings with different spectral responses to interrogate the optical response of a tilted Bragg grating. The sensor operation is based on the tilted Bragg grating sensitivity to external refractive index changes, which are translated as power variations by the interrogation scheme. Gasoline–ethanol solutions with concentrations ranging from 0% to 60% ethanol were used to demonstrate the sensor performance. The results allowed to estimate that the sensor is able, within its resolution limit, to detect ethanol concentration variations of 1.5% in gasoline–ethanol solutions and discriminate temperature variations of 0.5 °C. The all-optical sensor setup is compact and robust, making it a competitive alternative for the realization of fuel quality analyses in practical applications.

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Simultaneous measurement of strain, temperature and refractive index based on multimode interference, fiber tapering and fiber Bragg gratings

Cited by 67 publications

References 21 publications

Multiparameter fiber-optic sensors: a review

Multiparameter fiber-optic sensors: a review

Minimalist Approach for the Design of Microstructured Optical Fiber Sensors

Gasoline Quality Sensor Based on Tilted Fiber Bragg Gratings

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