Effects of metallic coatings on the thermal sensitivity of optical fiber sensors at cryogenic temperatures

Scurti, Federico; McGarrahan, John R.; Schwartz, J.

doi:10.1364/ome.7.001754

Cited by 37 publications

(18 citation statements)

References 18 publications

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“…Unlike PDMS, which is mostly used for temperature measurement, polyimide is mostly used for humidity measurement while measuring temperature. With a strong structural strength, polyimide can still exist stably in an environment of 400 °C and can be used for a long time in the temperature range of −200 to 300 °C [ 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 ].…”

Section: Sensors Coated With Polyimide Acrylate and Materials Fomentioning

confidence: 99%

“…It is worth discussing the coating materials to improve cryogenic temperature sensitivity. In [ 54 ], fiber sensors coated with different coating materials, such as acrylate, tin, indium-bismuth, and lead-tin, were described in the temperature range from 4.2 to 61 K. The results showed that the fiber coated with indium-bismuth had minimal sensitivity variation compared to the others [ 54 ]. Aluminum and PMMA, which are two contrast materials, were applied on FBG to verify the temperature sensitivities in the temperature range from 80 to 300 K [ 56 ].…”

Section: Sensors Coated With Polyimide Acrylate and Materials Fomentioning

confidence: 99%

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A Review of Coating Materials Used to Improve the Performance of Optical Fiber Sensors

Yang

Wang

et al. 2020

Sensors

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In order to improve the performance of fiber sensors and fully tap the potential of optical fiber sensors, various optical materials have been selectively coated on optical fiber sensors under the background of the rapid development of various optical materials. On the basis of retaining the original characteristics of the optical fiber sensors, the coated sensors are endowed with new characteristics, such as high sensitivity, strong structure, and specific recognition. Many materials with a large thermal optical coefficient and thermal expansion coefficients are applied to optical fibers, and the temperature sensitivities are improved several times after coating. At the same time, fiber sensors have more intelligent sensing capabilities when coated with specific recognition materials. The same/different kinds of materials combined with the same/different fiber structures can produce different measurements, which is interesting. This paper summarizes and compares the fiber sensors treated by different coating materials.

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Section: Sensors Coated With Polyimide Acrylate and Materials Fomentioning

confidence: 99%

Section: Sensors Coated With Polyimide Acrylate and Materials Fomentioning

confidence: 99%

A Review of Coating Materials Used to Improve the Performance of Optical Fiber Sensors

Yang

Wang

et al. 2020

Sensors

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“…FBG sensors have been used for CTE measurements subjected to thermal cycling [32]. However, due to the FBG sensors are intrinsic point sensors which can consist of multiple inscribed gratings and multiplexing along the sensor, achieving distributed high spatial resolution remains a challenge [35]. OFDR using RBS can resolve the spectral shift to obtain a strain profile of the local variations through each gage segment, U j (v) of the optical fiber.…”

Section: Coefficients Of Thermal Expansion Measurementsmentioning

confidence: 99%

Smart Adhesive Joint with High-Definition Fiber-Optic Sensing for Automotive Applications

Young

Penumadu

Foster

et al. 2020

Sensors

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Structural health monitoring of fiber-reinforced composite-based joints for automotive applications during their manufacturing and on-demand assessment for its durability in working environments is critically needed. High-definition fiber-optic sensing is an effective method to measure internal strain/stress development using minimally invasive continuous sensors. The sensing fiber diameters are in the same order of magnitude when compared to reinforcement (glass, basalt, or carbon fibers) used in polymer composites. They also offer a unique ability to monitor the evolution of residual stresses after repeated thermal exposure with varying temperatures for automotive components/joints during painting using an electrophoretic painting process. In this paper, a high-definition fiber-optic sensor utilizing Rayleigh scattering is embedded within an adhesive joint between a carbon fiber-reinforced thermoset composite panel and an aluminum panel to measure spatially resolved strain development, residual strain, and thermal expansion properties during the electrophoretic paint process-simulated conditions. The strain measured by the continuous fiber-optic sensor was compared with an alternate technique using thermal digital image correlation. The fiber-optic sensor was able to identify the spatial variation of residual strains for a discontinuous carbon fiber-reinforced composite with varying local fiber orientations and resin content.

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“…Interestingly, this cross-sensitivity turns out to be beneficial to improve the temperature sensitivity of Rayleigh and Brillouin sensors, because the thermal expansion or shrinkage of the fiber coating leads to a thermally-induced strain in the optical fiber, hence enhancing the influence of temperature changes on the fiber [8]. Actually, a variety of metals and polymers with large positive coefficient of thermal expansion (CTE) have been used as fiber coatings to enhance the thermal response of different fiber sensors, particularly at low temperature [7]- [12]. Note that the strain-independent response of spontaneous Raman scattering in silica fibers makes the thermally-induced strain to have no impact on the performance of Raman sensing.…”

Section: Introductionmentioning

confidence: 99%

Impact of the Fiber Coating on the Temperature Response of Distributed Optical Fiber Sensors at Cryogenic Ranges

Soto

Thévenaz

2018

J. Lightwave Technol.

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The thermomechanical behavior of a standard singlemode fiber with different coating materials is theoretically analyzed under different temperature conditions. Results show that the thermal expansion/shrinkage of the fiber coating introduces an extra strain on the optical fiber and can modify its thermal response. Distributed fiber sensors based on coherent Rayleigh and Brillouin scatterings are employed to characterize the impact of different coatings on the temperature sensitivity. The standard coating with dual-layer demonstrates a little influence on the thermal response at room temperature due to the softness of primary coating, but it increases the temperature sensitivity by some 50% at ∼220 K as the primary coating becomes stiffer at low temperature. Optical fibers with aluminum and Ormocer coatings are also experimentally tested. All the measured results agree well with the theoretical analysis.

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Effects of metallic coatings on the thermal sensitivity of optical fiber sensors at cryogenic temperatures

Cited by 37 publications

References 18 publications

A Review of Coating Materials Used to Improve the Performance of Optical Fiber Sensors

A Review of Coating Materials Used to Improve the Performance of Optical Fiber Sensors

Smart Adhesive Joint with High-Definition Fiber-Optic Sensing for Automotive Applications

Impact of the Fiber Coating on the Temperature Response of Distributed Optical Fiber Sensors at Cryogenic Ranges

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