Application of distributed sensing with long length FBG to structural health monitoring

Murayama, Hideaki; Igawa, Hirotaka; Omichi, Koji; Machijima, Yuichi

doi:10.1049/cp.2010.1143

Cited by 6 publications

(4 citation statements)

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“…We introduced the sequence of the simulation analysis by taking an example of the strain concentration measurement of an aluminum plate with holes under tensile loads [37]. The schematic of the aluminum plate are depicted in Fig.…”

Section: Simulation Methodsmentioning

confidence: 99%

Structural health monitoring by using fiber-optic distributed strain sensors with high spatial resolution

2013

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In this paper, we review our researches on the topics of the structural health monitoring (SHM) with the fiber-optic distributed strain sensor. Highly-dense information on strains in a structure can be useful to identify some kind of existing damages or applied loads in implementation of SHM. The fiber-optic distributed sensors developed by the authors have been applied to the damage detection of a single-lap joint and load identification of a beam simply supported. We confirmed that the applicability of the distributed sensor to SHM could be improved as making the spatial resolution higher. In addition, we showed that the simulation technique considering both structural and optical effects seamlessly in strain measurement could be powerful tools to evaluate the performance of a sensing system and design it for SHM. Finally, the technique for simultaneous distributed strain and temperature measurement using the PANDA-fiber Bragg grating (FBG) is shown in this paper, because problems caused by the cross-sensitivity toward strain and temperature would be always inevitable in strain measurement for SHM.

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Section: Simulation Methodsmentioning

confidence: 99%

Structural health monitoring by using fiber-optic distributed strain sensors with high spatial resolution

2013

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“…In this study, we determined the center wavelength by calculating the center of the full width at half maximum (FWHM) of spectrum at each position in the spectrogram. We verified the spatial resolution of the measurement system by measuring the strain distribution adjacent to holes in an aluminum tensile specimen 12 . We can say that the measurement system have the high spatial resolution of about 0.6 mm.…”

Section: Distributed Sensing With Ofdrmentioning

confidence: 99%

Distributed fiber-optic sensing system with OFDR and its applications to structural health monitoring

et al. 2009

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In the field of fiber-optic sensing technology, distributed sensors that return a value of the measurand as a function of linear position along an optical fiber are regarded as a promising sensor which can be applied to structural health monitoring (SHM). We have developed a distributed strain sensing technique using long gauge fiber Bragg grating (FBG) based on optical frequency domain reflectometry (OFDR). FBGs functioning as mirrors with wavelengthselective reflectivity have been used as strain or temperature sensors. OFDR is a technique designed to measure backreflections from optical fiber networks and components. In our system, we use a longer gauge FBG whose length is ordinarily more than 100 mm and we can measure strain at an arbitrary position along the FBG. Therefore, we can obtain continuous strain data along the FBG. Furthermore, since the spatial resolution in strain measurements is less than 1 mm, it enables us to measure the strain distribution of stress concentrated area, such as welded and bonded joints, precisely. In this paper, we describe the principle of the distributed sensing technique based on OFDR and the applications to strain monitoring of a bonded joint and a wing box structure.

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“…In parallel with the interest and use in optical communications, the Bragg gratings have gained a prominent position in optical fiber sensors, due to their versatility in different sensing applications [ 5 , 6 ]. Several markets, such as aeronautics [ 7 ], aerospace [ 8 ], civil engineering [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ], and biological [ 16 ] or environmental monitoring [ 17 ], have assimilated the advantages of this technology.…”

Section: Introductionmentioning

confidence: 99%

Optical Fiber Sensors and Sensing Networks: Overview of the Main Principles and Applications

Pendão

Silva

2022

Sensors

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Optical fiber sensors present several advantages in relation to other types of sensors. These advantages are essentially related to the optical fiber properties, i.e., small, lightweight, resistant to high temperatures and pressure, electromagnetically passive, among others. Sensing is achieved by exploring the properties of light to obtain measurements of parameters, such as temperature, strain, or angular velocity. In addition, optical fiber sensors can be used to form an Optical Fiber Sensing Network (OFSN) allowing manufacturers to create versatile monitoring solutions with several applications, e.g., periodic monitoring along extensive distances (kilometers), in extreme or hazardous environments, inside structures and engines, in clothes, and for health monitoring and assistance. Most of the literature available on this subject focuses on a specific field of optical sensing applications and details their principles of operation. This paper presents a more broad overview, providing the reader with a literature review that describes the main principles of optical sensing and highlights the versatility, advantages, and different real-world applications of optical sensing. Moreover, it includes an overview and discussion of a less common architecture, where optical sensing and Wireless Sensor Networks (WSNs) are integrated to harness the benefits of both worlds.

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Application of distributed sensing with long length FBG to structural health monitoring

Cited by 6 publications

References 0 publications

Structural health monitoring by using fiber-optic distributed strain sensors with high spatial resolution

Structural health monitoring by using fiber-optic distributed strain sensors with high spatial resolution

Distributed fiber-optic sensing system with OFDR and its applications to structural health monitoring

Optical Fiber Sensors and Sensing Networks: Overview of the Main Principles and Applications

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