Multi-parameter sensor based on single Long Period Grating in Panda fiber for the simultaneous measurement of SRI, temperature and strain

Esposito, Flavio; Srivastava, Anubhav; Iadicicco, Agostino; Campopiano, Stefania

doi:10.1016/j.optlastec.2018.12.022

Cited by 75 publications

(20 citation statements)

References 30 publications

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“…The measured temperature sensitivities for dips A, B and C are 6.13 pm/°C, 4.01 pm/°C, and 17.45 pm/°C, respectively. The maximum temperature and stain sensitivities are better than that of a typical FBG sensor and are compatible with that of many other PCFs-based sensors and multi-parameter sensors [ 27 , 28 , 29 , 30 ].…”

Section: Resultssupporting

confidence: 70%

Negative Curvature Hollow Core Fiber Based All-Fiber Interferometer and Its Sensing Applications to Temperature and Strain

Liu

Wei

et al. 2020

Sensors

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Negative curvature hollow core fiber (NCHCF) is a promising candidate for sensing applications; however, research on NCHCF based fiber sensors starts only in the recent two years. In this work, an all-fiber interferometer based on an NCHCF structure is proposed for the first time. The interferometer was fabricated by simple fusion splicing of a short section of an NCHCF between two singlemode fibers (SMFs). Both simulation and experimental results show that multiple modes and modal interferences are excited within the NCHCF structure. Periodic transmission dips with high spectral extinction ratio (up to 30 dB) and wide free spectral range (FSR) are produced, which is mainly introduced by the modes coupling between HE11 and HE12. A small portion of light guiding by means of Anti-resonant reflecting optical waveguide (ARROW) mechanism is also observed. The transmission dips, resulting from multimode interferences (MMI) and ARROW effect have a big difference in sensitivities to strain and temperature, thus making it possible to monitor these two parameters with a single sensor head by using a characteristic matrix approach. In addition, the proposed sensor structure is experimentally proven to have a good reproducibility.

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Section: Resultssupporting

confidence: 70%

Negative Curvature Hollow Core Fiber Based All-Fiber Interferometer and Its Sensing Applications to Temperature and Strain

Liu

Wei

et al. 2020

Sensors

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“…The fiber has a W-shaped refractive index profile with core NA = 0.12. For writing the LPG in this particular fiber, the electric arc discharge (EAD) technique was selected; additional details about the fabrication platform are widely discussed in [15]- [17].…”

Section: B Fiber Transducermentioning

confidence: 99%

Fiber optic biosensor for inflammatory markers based on long period grating

et al. 2020

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Here, we have reported the development and testing of a label-free fiber optic biosensor, for the real-time detection in serum of an inflammatory marker, the C-reactive protein (CRP). It is based on a novel configuration involving a long period grating (LPG) in double cladding fiber, with specific refractive index profile. Optimization of the sensitivity by means of mode transition was obtained through slight chemical etching of the fiber surface. A thin layer of graphene oxide was deposited around the LPG portion, to provide functional groups for the covalent immobilization of the biological recognition element. A large working range of CRP concentrations of clinical relevance was covered and a low limit of detection of 1.1 ng/mL was obtained in serum. The development of biosensors able to guarantee simple and rapid in-situ monitoring approach is quite an actual topic: an example is the SARS-CoV-2 infection.

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“…By properly modifying the structure of an FBG to enable the interrogation of the fiber surrounding environment, it is possible to achieve sensors with high sensitivity and figures of merit. FBG-based solutions that have been recently reported include etched FBGs [ 7 ], tilted FBGs [ 12 ] also combined with plasmonic effects [ 13 ], etched-tilted FBGs [ 14 ], and long-period gratings [ 15 ]. Finally, the third class of biosensors includes devices based on interferometry, which guarantees excellent sensitivity ratings, but also implies operating with a large sensor bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Shallow-Tapered Chirped Fiber Bragg Grating Sensors for Dual Refractive Index and Temperature Sensing

Ayupova

Shaimerdenova

Tosi

2021

Sensors

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In this work, we present a gold-coated shallow-tapered chirped fiber Bragg grating (stCFBG) for dual refractive index (RI) and temperature sensing. The stCFBG has been fabricated on a 15-mm long chirped FBG, by tapering a 7.29-mm region with a waist of 39 μm. The spectral analysis shows two distinct regions: a pre-taper region, in which the stCFBG is RI-independent and can be used to detect thermal changes, and a post-taper region, in which the reflectivity increases significantly when the RI increments. We estimate the RI and thermal sensitivities as 382.83 dB/RIU and 9.893 pm/°C, respectively. The cross-talk values are low (−1.54 × 10−3 dB/°C and 568.1 pm/RIU), which allows an almost ideal separation between RI and thermal characteristics. The stCFBG is a compact probe, suitable for long-term and temperature-compensated biosensing and detection of chemical analytes.

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Multi-parameter sensor based on single Long Period Grating in Panda fiber for the simultaneous measurement of SRI, temperature and strain

Cited by 75 publications

References 30 publications

Negative Curvature Hollow Core Fiber Based All-Fiber Interferometer and Its Sensing Applications to Temperature and Strain

Negative Curvature Hollow Core Fiber Based All-Fiber Interferometer and Its Sensing Applications to Temperature and Strain

Fiber optic biosensor for inflammatory markers based on long period grating

Shallow-Tapered Chirped Fiber Bragg Grating Sensors for Dual Refractive Index and Temperature Sensing

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