Temperature sensing characteristics of metal coated FBG during dynamic cooling process

Li, Yulong; Ke, Yang; Li, Xuewen

doi:10.1016/j.yofte.2018.08.013

Cited by 18 publications

(11 citation statements)

References 30 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%

“…The FBG coated with polymer had the biggest value of 48 pm/°C, which was 10 times bigger than that of the bare FBG. The same type of experiment was conducted in [ 60 ], where different materials, such as Ni, Cu, Zn, and Sn, were coated on the FBGs [ 60 ]. The temperature sensitivities of them were 1.5 times, 2 times, 2.5 times, and 3 times more than that of the bare FBG, respectively [ 60 ].…”

Section: Sensors Coated With Polyimide Acrylate and Materials Fomentioning

confidence: 99%

“…The same type of experiment was conducted in [60], where different materials, such as Ni, Cu, Zn, and Sn, were coated on the FBGs [60]. The temperature sensitivities of them were 1.5 times, 2 times, 2.5 times, and 3 times more than that of the bare FBG, respectively [60]. Equally important, the structures of fiber sensors were not damaged under the cryogenic temperatures [54,62,63].…”

Section: Sensors Coated With Polyimide Acrylate and Materials For Cryogenic Applicationsmentioning

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%

Section: Sensors Coated With Polyimide Acrylate and Materials For Cryogenic Applicationsmentioning

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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“…Jang and Kim [22] presented a methodology of impact-induced delamination assessment using FBG sensor. Li et al [23] investigated the temperature sensitivity of FBG sensors coated with metals during a dynamic cooling process. Davis and Kersey [24] presented an interrogation technique based on a wavelength division coupler to detect the wavelength shift of FBG sensor.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Responses Measured by Optical Fiber Sensor for Structural Health Monitoring

Her

Chung

2019

Applied Sciences

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An optical fiber sensing system integrating a fiber Bragg grating (FBG) sensor, a long-period fiber grating (LPFG) optical filter and a photodetector is presented to monitor the dynamic response of a structure subjected to base excitation and impact loading. The FBG sensor is attached to a test specimen and connected to an LPFG filter. As the light reflected from the FBG sensor is transmitted through the long-period fiber grating filter, the intensity of the light is modulated by the wavelength, which is affected by the strain of the FBG. By measuring the intensity of the light using a photodetector, the wavelength reflected from the FBG sensor can be demodulated, thus leading to the determination of the strain in the structure. To demonstrate its effectiveness, the proposed sensing system was employed to measure the dynamic strain of a beam subjected to mechanical testing. The mechanical tests comprised three load scenarios: base excitation by a shaker at resonant frequency, impact loading by a hammer and shock test on a drop table. To monitor the dynamic strain during the test and validate the accuracy of the measurement of the FBG sensor, strain gauge was used as reference. Experimental results show good correlation between the measurements of FBG sensor and strain gauge. The present work provides a fast response and easy-to-implement optical fiber sensing system for structural health monitoring based on real-time dynamic strain measurements.

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“…Several aspects including the detection range, temperature sensitivity, stability, and reliability are crucial for greater performance of the FBG temperature sensor. Various methods have been reported for instance FBG coated with different materials to improve the temperature sensitivity [1,2]. Meanwhile, intense studies have been performed to develop the FBG sensor that are robust and reliable in dynamic environment [3].…”

Section: Introductionmentioning

confidence: 99%

Influence of Internal Stresses in Few-Mode Fiber on the Thermal Characteristics of Regenerated Gratings

et al. 2019

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The pre-treatment of few-mode fibers (FMFs) has been successfully done with CO2 laser. The wavelength difference, Δ between the two resonant wavelengths in the few-mode fiber Bragg grating (FMFBG) varies with temperature increment during the annealing process. The results show that the treated fibers with lower stresses have lower thermal sensitivity in Δ than that of non-treated fiber. However, the treated fibers produce FMFBGs with better thermal durability and regeneration ratio. It is conceived that the presence of those stresses in the pristine fiber is responsible for the high thermal sensitivity in Δ. The thermal relaxation of stresses and structural rearrangement during the thermal annealing process are responsible for the degradation of the strength and resilience of the regenerated grating.

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Temperature sensing characteristics of metal coated FBG during dynamic cooling process

Cited by 18 publications

References 30 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

Dynamic Responses Measured by Optical Fiber Sensor for Structural Health Monitoring

Influence of Internal Stresses in Few-Mode Fiber on the Thermal Characteristics of Regenerated Gratings

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