Fibre Tip Sensor with Embedded FBG-LPG for Temperature and Refractive Index Determination by means of the Simple Measurement of the FBG Characteristics

Berrettoni, Chiara; Trono, C.; Vignoli, Valerio; Baldini, Francesco

doi:10.1155/2015/491391

Cited by 15 publications

(9 citation statements)

References 13 publications

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“…A similar approach is also reported in Ref. 48, where a cascade of LPFBG and FBG are formed near the tip of a single-mode fiber (Fig. 29).…”

Section: Optical Engineeringmentioning

confidence: 65%

“…It is straightforward to use FBGs, LPFBG, tilted FBGs, and their combinations [47][48][49][50][51] to sense different sets of parameters. Furthermore, all types of FBG/LPFBG and tilted FBG sensors can be interrogated very straightforwardly by spectrally resolved interrogators.…”

Section: Multiparameter Sensors Based On Fbgs and Lpfbgsmentioning

confidence: 99%

“…Sensors for simultaneous measurement of RI and temperature certainly belong to this group. 48,49 The approach described in Ref. 49 utilizes an LPFBG and an FBG written one after another in a Dfiber.…”

Section: Optical Engineeringmentioning

confidence: 99%

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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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“…A similar approach is also reported in Ref. 48, where a cascade of LPFBG and FBG are formed near the tip of a single-mode fiber (Fig. 29).…”

Section: Optical Engineeringmentioning

confidence: 65%

Section: Multiparameter Sensors Based On Fbgs and Lpfbgsmentioning

confidence: 99%

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Multiparameter fiber-optic sensors: a review

2019

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“…

Recently, it was reported RI measurements using a LPFG in line with a FBG for temperature compensation [30]. The present work follows a similar configuration, focusing on the

…”

mentioning

confidence: 98%

Optical sensor based on hybrid FBG/titanium dioxide coated LPFG for monitoring organic solvents in edible oils

Coelho

Viegas

Santos

et al. 2016

Talanta

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A hybrid optical sensing scheme based on a fiber Bragg grating (FBG) combined with a titanium dioxide coated long period fiber grating (LPFG) for monitoring organic solvents in high refractive index edible oils is reported. In order to investigate and optimize the sensor performance, two different FBG/LPFG interrogation systems were investigated. The readout of the sensor was implemented using either the wavelength shift of the LPFG resonance dip or the variation in the optical power level of the reflected/transmitted light at the FBG wavelength peak, which in turn depends on the wavelength position of the LPFG resonance. Hexane concentrations up to 20%V/V, corresponding to the refractive index range from 1.451 to 1.467, were considered. For the transmission mode of operation, sensitivities of 1.41 nm/%V/V and 0.11 dB/%V/V, with resolutions of 0.58%V/V and 0.29%V/V, were achieved when using the LPFG wavelength shift and the FBG transmitted optical power, respectively. For the FBG reflection mode of operation, a sensitivity of 0.07 dB/%V/V and a resolution better than 0.16%V/V were estimated.

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“…In the last decades, new deposition techniques such as Layer-by-Layer (LbL) nano assembly [10], solgel [11], sputtering [12], or electrospinning [13] have enabled the fabrication of thin films and nanostructured sensitive coatings onto optical fiber structures. Diverse optical fiber sensors based on LPGs have been recently developed to monitor different physical and chemical magnitudes as humidity [14,15], temperature [16], pH [17], hydrogen [18,19], ethanol [20], ammonia [21], volatile organic compounds [22] and proteins [23], among others [24]. Different approaches have successfully designed sensors for two or more magnitudes thanks to the use of more than one grating along the optical fiber, as the work presented by Viegas et al [25], where RH and temperature were simultaneously measured by the combination of a LPG and a fiber Bragg grating.…”

mentioning

confidence: 99%

Simultaneous measurement of humidity and temperature based on a partially coated optical fiber long period grating

Urrutia

Goicoechea

Ricchiuti

et al. 2016

Sensors and Actuators B: Chemical

128

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A humidity and temperature optical fiber sensor based on a long-period grating (LPG), which can provide simultaneous response to both magnitudes, is proposed and demonstrated via experiments. Previously, the LPG was fully coated with humidity sensitive nanostructured polymeric thin films by the Layer-by-Layer (LbL) nano assembly technique. Hence the surrounding refractive index was changed, so provoking wavelength shifts of the attenuation bands of the transmission spectrum. This fully coated LPG was exposed to relative humidity (RH) and temperature tests, varying from 20% to 80% RH and from 25 ºC to 85 ºC, respectively. Then, half of the LPG coating was chemically removed and this results in the splitting of the main attenuation band into two different contributions. When this semi-coated LPG was also exposed to RH and temperature tests, the new two attenuation bands Revised Manuscript lick here to view linked References presented different behaviours for humidity and temperature. This novel dual-wavelength based sensing method enables the simultaneous measurement of RH and temperature using only one LPG.

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Fibre Tip Sensor with Embedded FBG-LPG for Temperature and Refractive Index Determination by means of the Simple Measurement of the FBG Characteristics

Cited by 15 publications

References 13 publications

Multiparameter fiber-optic sensors: a review

Multiparameter fiber-optic sensors: a review

Optical sensor based on hybrid FBG/titanium dioxide coated LPFG for monitoring organic solvents in edible oils

Simultaneous measurement of humidity and temperature based on a partially coated optical fiber long period grating

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