Thermal and chemical treatment of polymer optical fiber Bragg grating sensors for enhanced mechanical sensitivity

Pospori, Andreas; Marques, Carlos; Sáez-Rodríguez, D.; Nielsen, Kristian; Bang, Ole; Webb, David J.

doi:10.1016/j.yofte.2017.02.006

Cited by 77 publications

(48 citation statements)

References 38 publications

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“…Moreover, by comparing the two and five rings mPOF with 138 µm and 143 µm diameters; the former has the lowest sensitivity due to the combined effect of large diameter and less holes. Nevertheless, our results are similar to those previously reported in three rings mPOF Bragg gratings [38]. Also, we can consider that the values are equal within experimental uncertainty.…”

Section: Temperature Strain and Humidity Performancesupporting

confidence: 93%

Inscription of Bragg gratings in undoped PMMA mPOF with Nd:YAG laser at 266 nm wavelength

et al. 2019

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We present the first Bragg gratings fabricated in two, three and five rings undoped PMMA microstructured polymer optical fibres (mPOFs) with relative low cost 266 nm Nd:YAG laser in the 850 nm region. The fibers were connectorised with commercial ferrules for easy coupling with silica patch cables. Temperature, humidity and strain sensitivities are measured and also the impact of ring structure and the diameter of POF on the characterization measurements are studied for potential applications. We also analyzed the effect of the number of hexagonal rings structure in gratings fabrication, noticing that larger number of rings lead to more difficulties to obtain strong gratings, where we consider this performance due to the scattering effects. We demonstrate Bragg gratings fabrication in 5-rings structure mPOF after 6 min by using 266 nm Nd:YAG laser whereas no Bragg gratings have been fabricated so far using 325 nm He-Cd laser system. Up to 30 dB relative reflected power gratings are obtained in two rings mPOF, showing good time stability and promising results for undoped mPOF applications.

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Section: Temperature Strain and Humidity Performancesupporting

confidence: 93%

Inscription of Bragg gratings in undoped PMMA mPOF with Nd:YAG laser at 266 nm wavelength

et al. 2019

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“…The average loss per connector is less than 1 dB, which is a considerable improvement compared to previously reported values (8.45 dB) [50]. All fibe pieces were pre-annealed with the same procedure used in [51], where the fibe was placed for 15 minutes in a vessel fille with heated tap water (60 ± 1…”

Section: Experimental Setup and Inscriptionmentioning

confidence: 73%

“…6(a) we can see that the strain response of both dips of the PS-POFBG shows good linearity, the estimated strain sensitivity was 0.76 ± 0.01 pm/με, which is slightly larger than the 0.7 pm/με of the silica PS-FBG reported in [59]. A reversible process can be observed when the strain decreases showing a very small amount of hysteresis, in which the annealing process employed to the POFBG helps for this fact [26], [51]. Fig.…”

Section: Sensing Characterization Of a Ps-pofbgmentioning

confidence: 78%

Phase-Shifted Bragg Grating Inscription in PMMA Microstructured POF Using 248-nm UV Radiation

Pereira

Pospori

Antunes

et al. 2017

J. Lightwave Technol.

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Abstract-In this work, we experimentally validate and characterize the first phase-shifted polymer optical fiber Bragg gratings (PS-POFBGs) produced using a single pulse from a 248-nm krypton fluoride laser. A single-mode poly (methyl methacrylate) optical fiber with a core doped with benzyl dimethyl ketal for photosensitivity improvement was used. A uniform phase mask customized for 850-nm grating inscription was used to inscribe these Bragg structures. The phase shift defect was created directly during the grating inscription process by placing a narrow blocking aperture in the center of the UV beam. The produced high-quality Bragg grating structures, presenting a double dips, reject 16.3 dB (97.6% reflectivity) and 13.2 dB (95.2% reflectivity) of the transmitted power, being therefore appropriate for sensing or other photonic applications. Its transmission spectrum possesses two sharp transmission notches, allowing a significant increase in measurement resolution compared to direct interrogation of a single grating. The reflection and transmission spectra when multiple phase shifts are introduced in the fiber Bragg grating structure are also shown. The PS-POFBG's strain, temperature, pressure, and humidity characteristics have been experimentally analyzed in detail to assess their potential usage as sensors.

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“…In recent years, optical fiber sensors made of silicon-based optical fibers or polymer optical fibers have been commonly utilized for numerous types of physical detection [1][2][3][4][5][6][7][8][9][10][11][12] because a fiber sensor has many features that are better than conventional electronic sensors. Fiber optic sensors can be used for large-scale distributed monitoring, and also have anti-electromagnetic interference, high sensitivity, light weight, good adaptability in shape, and electrical isolation.…”

Section: Introductionmentioning

confidence: 99%

Design and Testing of a 2D Optical Fiber Sensor for Building Tilt Monitoring Based on Fiber Bragg Gratings

Chao

Liang

2017

ASI

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Abstract:In this paper, a new type of optical fiber tilt sensor based on fiber Bragg grating (FBG) is presented for 2D dual-axis tilt angle sensing. The tilt sensor is composed of two cylindrical floats suspended in water, connected with FBG. When the external environment causes the tilting of the sensor, the surface of the liquid within the container will form a new balanced liquid surface plane due to the gravity and change the height of the liquid at different locations in the container. So the buoyancy force of the cylindrical floats of the sensor will vary with the depth of liquid, thus the changed FBG strain will cause the FBG reflection central wavelength shift. According to the measured central wavelength shift by the optical spectral analyzer (OSA), we can obtain the two-axis tilt angle of the sensor. The proposed sensor can detect a tilt angle range of −5 degrees to +5 degrees and achieve a sensitivity of 0.1 • with optical spectrum analyzer resolution of 0.01 nm. Due to its good sensing linearity, the proposed sensor can be applied in building tilt measurement.

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Thermal and chemical treatment of polymer optical fiber Bragg grating sensors for enhanced mechanical sensitivity

Cited by 77 publications

References 38 publications

Inscription of Bragg gratings in undoped PMMA mPOF with Nd:YAG laser at 266 nm wavelength

Inscription of Bragg gratings in undoped PMMA mPOF with Nd:YAG laser at 266 nm wavelength

Phase-Shifted Bragg Grating Inscription in PMMA Microstructured POF Using 248-nm UV Radiation

Design and Testing of a 2D Optical Fiber Sensor for Building Tilt Monitoring Based on Fiber Bragg Gratings

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