Smart Sensing of PSC Girders Using a PC Strand with a Built-in Optical Fiber Sensor

Kim, Sung Tae; Yoon, Hyejin; Park, Young-Hwan; Jin, Seung-Seop; Shin, Sangmun; Yoon, Suk Min

doi:10.3390/app11010359

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…The place where the specimen was located was an area that experiences severe temperature changes, and the range of temperature change over the four seasons was about 40 • C. The long-term measurement started around December when the temperature was low, and the change in the wavelength of light emitted from the optical fiber sensor due to the change in temperature according to the seasons was converted into a prestress force, as shown in Figure 10 below. The process of converting the optical wavelength value of the optical fiber sensor into a prestress force was applied as in the study by Seongtae Kim et al [18]. As shown in Figure 11, there was a slight difference in the wavelength values of the optical fiber sensors in the composite and non-composite specimens, but the change was in line with the trend of seasonal temperature change.…”

Section: Fabrication Of Psc Beam Specimensmentioning

confidence: 99%

Analysis of Long-Term Prestress Loss in Prestressed Concrete (PC) Structures Using Fiber Bragg Grating (FBG) Sensor-Embedded PC Strands

et al. 2021

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This study aims to develop a prestressed concrete steel (PC) strand with an embedded optical Fiber Bragg Grating (FBG) sensor, which has been developed by the Korea Institute of Civil Engineering and Building Technology since 2013. This new strand is manufactured by replacing the steel core of the normal PC strand with a carbon-fiber-reinforced polymer (CFRP) rod with excellent tensile strength and durability. Because this new strand is manufactured using the pultrusion method, which is a composite material manufacturing process, with an optical fiber sensor embedded in the inner center of the CFRP Rod, it ensures full composite action as well as proper function of the sensor. In this study, a creep test for maintaining a constant load and a relaxation test for maintaining a constant displacement were performed on the proposed sensor-type PC strand. Each of the two tests was conducted for more than 1000 h, and the long-term performance verification of the sensor-type PC strand was only completed by comparing the performance with that of a normal PC strand. The test specimens were fabricated by applying an optical fiber sensor-embedded PC strand, which had undergone long-term performance verification tests, to a reinforced concrete beam. Depending on whether grout was injected in the duct, the specimens were classified into composite and non-composite specimens. A hydraulic jack was used to prestress the fabricated beam specimens, and the long-term change in the prestress force was observed for more than 1600 days using the embedded optical fiber sensor. The experimental results were compared with the analytical results to determine the long-term prestress loss obtained through finite-element analysis based on various international standards.

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Section: Fabrication Of Psc Beam Specimensmentioning

confidence: 99%

Analysis of Long-Term Prestress Loss in Prestressed Concrete (PC) Structures Using Fiber Bragg Grating (FBG) Sensor-Embedded PC Strands

et al. 2021

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“…FOS can be divided into distributed FOS and quasidistributed FOS. e OF in the distributed FOS technology functions both as a sensor and light source transmission medium; it can inspect the whole area but also realizes fuzzy identification of the intrusion events in the detection area [4]. According to the nature of the signal, FOS technology can be divided into Raman effect-enabled sensing technology, interference effect-enabled sensing technology, Brillouin effect-enabled sensing technology, forward transmission mode coupling-enabled sensing technology, and backward Rayleigh scattering-enabled sensing technology.…”

Section: Introduction E Development Of Optical Communication and Opticalmentioning

confidence: 99%

Application of Smart Fiber Optic Sensor Technology in Feature Extraction, Recognition, and Detection

Gao

Cai

2022

Wireless Communications and Mobile Computing

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To improve the signal recognition effect of the security system, this paper studies the security system based on intelligent Fiber Optic Sensor (FOS) technology. Firstly, the research background of intelligent FOS is introduced, and its current situation in feature extraction, recognition, and detection is introduced. Secondly, the double Mach–Zehnder (M-Z) Optical Fiber- (OF-) based interferometer model is implemented, and the Wavelet Analysis (WA) theory is introduced to analyze the characteristic threshold and Frequency (F) characteristics of intrusion signal. Finally, the distributed intelligent FOS-based perimeter security system is constructed, and an empirical study is conducted to verify its performance. The results show that the intruder knocking-induced signal F, intruder climbing-induced signal F, noiseless environment-induced signal F, and rainy environment-induced signal F are 0–250 kHz, 0–25 kHz, 0–1.5 kHz, and 0–3.5 kHz, respectively; in all the four cases, excellent results have been obtained after wavelet threshold denoising. Meanwhile, the received signal is decomposed into seven layers through multiscale WA theory. The signal feature classification is based on WA and takes variance as the representation, and the clear classification results are obtained; when the False Alarm Rate (FAR) = 1%, the detection probability of the proposed system is about 99%, while the detection probability of the traditional system is about 3%. The reference arm and sensing arm of the distributed OF-based perimeter security system can be laid in the same optical cable. Therefore, the designed wavelet threshold filtering method is feasible, and the detection probability of the designed WA-based system is higher than that of the traditional security system. The research content provides a reference for the development of intelligent FOS technology in the field of security.

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“…FBG sensors are widely used in the smart measurements, such as dynamic strain, pressure measurement, temperature of a full scale pre-stressed concrete bridge made with high performance concrete during the construction process, buildings, piles, bridges, pipelines, tunnels, and dams (Matin et al 2005;Lin et al 2002;Li et al 2004;Sahidan et al 2020). It is also used for maintenance in flight monitoring and space vehicles, marine and medical science (Seo et al 2009;Lee et al 2010;Kim et al 2021). Its application has also been extended to provide online monitoring of cracks or leaks in reactor vessel head penetration of Nuclear power plant (NPP) (Miesen et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Effect of grating length on the response of fiber bragg grating bonded with graphene on polymer plate

et al. 2021

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In this work, the sensing characteristics of FBG bonded with graphene on a polymer plate are demonstrated under various mechanical deflections within the tension and compression modes. The sensing elements utilized for this purpose were 5 mm, 15 mm, 25 mm, 35 mm and 45 mm FBG sensor bonded onto the surface of graphene with polymer plate. Results showed a linear relation between the sensitivity and deflection for the FBGs bonded onto plastic and deflected at stress locations of 1 cm and 2 cm. However, for the stress location of 3 cm and for the FBGs bonded onto graphene with plastic, the response curves were deviated from being linear. The sensitivity at 3 cm stress location for tension and compression modes was found to be larger than those for other applied stress locations. Besides, a linear relationship between the sensitivity and deflection was observed for the 5 mm, 15 mm, 25 mm and 35 mm grating lengths. It was found that the FBG sensitivity was increased upon the increment of grating length. Noticeably, the sensitivity and deflection correlation for the 45 mm FBG was found to be sinusoidal, by which a very sensitive sensor can be produced for environmental monitoring and alarm system applications.

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Smart Sensing of PSC Girders Using a PC Strand with a Built-in Optical Fiber Sensor

Cited by 6 publications

References 11 publications

Analysis of Long-Term Prestress Loss in Prestressed Concrete (PC) Structures Using Fiber Bragg Grating (FBG) Sensor-Embedded PC Strands

Analysis of Long-Term Prestress Loss in Prestressed Concrete (PC) Structures Using Fiber Bragg Grating (FBG) Sensor-Embedded PC Strands

Application of Smart Fiber Optic Sensor Technology in Feature Extraction, Recognition, and Detection

Effect of grating length on the response of fiber bragg grating bonded with graphene on polymer plate

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