Fibre optic sensors for load-displacement measurements and comparisons to piezo sensor based electromechanical admittance signatures

Maheshwari, Muneesh; Annamdas, Venu Gopal Madhav; Pang, J.H.L.; Tjin, Swee Chuan; Asundi, Anand

doi:10.1117/12.2084039

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…2π in SOP cycle means a change of L b in the length of PM fiber used as FOPS. The SOP cycle is segmented to calculate total strain in the specimen [18].…”

Section: Fopsmentioning

confidence: 99%

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Damage monitoring using fiber optic sensors and by analysing electro-mechanical admittance signatures obtained from piezo sensor

et al. 2015

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Damage monitoring is the need of the hour in this age of infrastructure. Many methods are being used for damage monitoring in different mechanical and civil structures. Some of them are strain based methods in which abruptly increased strain signifies the presence of damage in the structure. This article focuses on crack monitoring of a fixedfixed beam using fiber optic sensors which can measure strain locally or globally. The two types of fiber optic sensors used in this research are fiber Bragg grating (FBG) and fiber optic polarimetric sensors (FOPS). FBG and FOPS are used for local strain monitoring (at one point only) and global strain monitoring (in the entire specimen) respectively. At the centre of the specimen, a piezoelectric wafer active sensor (PWAS) is also attached. PWAS is used to obtain electromechanical admittance (EMA) signatures. Further, these EMA signatures are analysed to access the damage state in the beam. These multiple smart materials together provide improved information on damages in the specimen which is very valuable for the structural health monitoring (SHM) of the specimen.

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“…2π in SOP cycle means a change of L b in the length of PM fiber used as FOPS. The SOP cycle is segmented to calculate total strain in the specimen [18].…”

Section: Fopsmentioning

confidence: 99%

“…Thus, it can be said that a single smart material cannot present the complete health assessment. Employment of multiple smart materials was suggested to get a clearer understanding of damage occurrence in different structures [17,18]. This paper thus focuses on using multiple smart materials.…”

Section: Introductionmentioning

confidence: 99%

Damage monitoring using fiber optic sensors and by analysing electro-mechanical admittance signatures obtained from piezo sensor

et al. 2015

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“…7 shows the responses of the three sections of this new FOPS design, the lead-in fiber, the active fiber and the lead-out fiber, when subjected to external perturbations respectively. FromFigure 4.7, it is clear that the sensitivity of both the CHAPTER -4 Efficient Design of Fiber Optic Polarimetric Sensors (FOPS) for crack location and sizing lead-in and lead-out fibers is almost negligible as compared to that of the active fiber.…”

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confidence: 99%

Structural health monitoring by Fiber Optic Polarimetric sensors (FOPS) and Fiber Bragg Grating (FBG)

Maheshwari¹

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Structural health monitoring (SHM) techniques using smart materials are on the rise to meet the ever ending demand due to increased construction and manufacturing activities worldwide. The civil-structural components such as slabs, beams and columns and aero-components such as wings are constantly subjected to some or the other forms of external loading. SHM is one of the most important issues as it prevents overloading, serious damages, also averts risks. A number of methods utilizing different concepts and techniques have already been proposed, but online structural health monitoring is very difficult and ineffective with classical method. The Fiber Optic Sensor (FOS) technologies facilitate real time non-destructive health monitoring

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Application of Metamaterial Surface Plasmon and Waveguide for Robotic-Arm Based Structural Health Monitoring

Annamdas

Soh

2018

J Nondestruct Eval

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Several electromagnetic (EM) metamaterial designs and their variants, such as localized surface plasmons (LSPs), with ultra sensing capabilities for structural health monitoring (SHM) have emerged in the last few years. These LSPs, in a confined configuration with the 'engineering structure under inspection' generate a unique diagnosable surface plosmons/ wave as output, when subjected to input EM waves in the near fields. This paper presents a procedure to enhance the output surface wave zone by adopting them in a nonconfining configurations. A novel procedure of transferring 'surface waves' from within the confined boundaries of LSP to far-off distance along a guided path is presented. This is achieved for both confined and non-confined configurations to monitor displacements as small as th 100 1 of a mm and as large as 10's of cms, respectively, highlighting the wider scope for real world applications. In experiments, the input EM waves were supplied by the vector network analyser, and the output surface waves were collected by the same via a 2D robotic scanner, controlled using custom software. Metallic specimens in confined configuration such as 'aluminium' shell and beam were used for monitoring "angular" and "vertical" deformations. Further, non-metallic specimens in non-confined configurations such as 'rubber' bicycle tube and 'concrete' blocks were used for monitoring "pressure" and "horizontal" displacements. Flexibility of a LSP sensor allowed its easy attachment to various specimens by bending and twisting which ranged from linear ( 0 0 ) to double bent ( 0 180 ) shapes. This paper provides a window of opportunity for SHM application of bendable metamaterials using waveguides and robots.

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Fibre optic sensors for load-displacement measurements and comparisons to piezo sensor based electromechanical admittance signatures

Cited by 4 publications

References 25 publications

Damage monitoring using fiber optic sensors and by analysing electro-mechanical admittance signatures obtained from piezo sensor

Damage monitoring using fiber optic sensors and by analysing electro-mechanical admittance signatures obtained from piezo sensor

Structural health monitoring by Fiber Optic Polarimetric sensors (FOPS) and Fiber Bragg Grating (FBG)

Application of Metamaterial Surface Plasmon and Waveguide for Robotic-Arm Based Structural Health Monitoring

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