On-specimen strain measurement with fiber optic distributed sensing

Uchida, Shun; Levenberg, Eyal; Klar, Assaf

doi:10.1016/j.measurement.2014.09.054

Cited by 45 publications

(32 citation statements)

References 28 publications

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“…Another technique of using strain gauge was introduced by Gunasekaren and Robinson (2008). Recently, distributed fibre optic technology (DFOT) was introduced for stiffness measurement at small strain in the laboratory in a Conjuncture Helical Configuration (CHC) Pattern (Uchida et al, 2015). The method is being tested in the laboratory by conducting uniaxial compression test on acrylic glass specimen.…”

Section: Overview Of Small Strain Measuring Instrumentsmentioning

confidence: 99%

“…A novel alternative approach for on-specimen strain measurement using high spatial fibre optics distributed sensing technology on a uniaxial testing machine in the laboratory was illustrated by Uchida et al (2015). Conjuncture helical envelope configuration CHC (Fig.…”

Section: Distributed Fibre Optic Strain Sensor (Conjuncture Helical Cmentioning

confidence: 99%

“…a b Fig. 9: (a) Cantilever-LDTs setup (Yimsiri et al, 2005); (b) Diagram of FBG-LDTs setup on the specimen (Xu et al, 2014) Uchida et al (2015 suggested the application of fibre distributed sensing technology for on-specimen strain measurement in a triaxial testing apparatus. However, to date, the technique of fully glued fibre on soil specimens have yet to be implemented.…”

Section: Distributed Fibre Optic Strain Sensor (Conjuncture Helical Cmentioning

confidence: 99%

“…However, to date, the technique of fully glued fibre on soil specimens have yet to be implemented. configuration (Uchida et al, 2015) 5. Measurement of both local axial and radial strain using the same transducer…”

Section: Distributed Fibre Optic Strain Sensor (Conjuncture Helical Cmentioning

confidence: 99%

See 3 more Smart Citations

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

Isah¹,

Civil²,

Mohamad³

et al. 2018

Int. j. adv. appl. sci.

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Accurate determination of soil stiffness at small strain (0.001 % -0.1 % strain) is very important as it portrayed the stiffness of soil underneath geotechnical structures. To evaluate stiffness at small strain, it is important to achieve a minimum strain measurement accuracy of 10-4 %, this is attained using transducers, strain gauges and sensors which are attached on the specimen locally inside the triaxial cell. Several local strains measuring techniques have emerged with the intention of developing a seamless system which is easy, accurate and less expensive. This study epitomizes the existing types of small strain measuring instrumentation, their trend of development and technology. Those that can measure both axial and radial strain, axial strain alone and radial strain alone are distinguished and described. Also, the accuracy, features, merits, and demerits of each type of device have been discussed accordingly. This paper provides information that enables selection of a suitable device that will best fit a particular application. It is anticipated that the study will inspire further researches in the area.

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Section: Overview Of Small Strain Measuring Instrumentsmentioning

confidence: 99%

Section: Distributed Fibre Optic Strain Sensor (Conjuncture Helical Cmentioning

confidence: 99%

Section: Distributed Fibre Optic Strain Sensor (Conjuncture Helical Cmentioning

confidence: 99%

Section: Distributed Fibre Optic Strain Sensor (Conjuncture Helical Cmentioning

confidence: 99%

See 2 more Smart Citations

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

Isah¹,

Civil²,

Mohamad³

et al. 2018

Int. j. adv. appl. sci.

View full text Add to dashboard Cite

show abstract

“…BOTDRs (Brillouin optical time domain reflectometers) have been applied to measure the distributed temperature and strain along the entire optical fiber up to 30 km, by utilizing the proportionality between the strain and temperature in an optical fiber and the Brillouin frequency shift [1][2][3][4]. In the BOTDR system, a laser probing pulse is launched into the sensing fiber and its spontaneous Brillouin scattering (SpBS) spectrum along the fiber is detected at the same end of the fiber, which is convenient for the field applications [4,5]. Conventionally, the BOTDR system requires a time-consuming frequency scanning of the entire SpBS spectrum and a great amount of averaging up to 2 20 times to obtain the accurate Brillouin scattering spectrum (BSS) by Lorentz fitting [6,7].…”

Section: Introductionmentioning

confidence: 99%

Double peak-induced distance error in short-time-Fourier-transform-Brillouin optical time domain reflectometers event detection and the recovery method

Luo

et al. 2015

Appl. Opt.

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The measured distance error caused by double peaks in the BOTDRs (Brillouin optical time domain reflectometers) system is a kind of Brillouin scattering spectrum (BSS) deformation, discussed and simulated for the first time in the paper, to the best of the authors' knowledge. Double peak, as a kind of Brillouin spectrum deformation, is important in the enhancement of spatial resolution, measurement accuracy, and crack detection. Due to the variances of the peak powers of the BSS along the fiber, the measured starting point of a step-shape frequency transition region is shifted and results in distance errors. Zero-padded short-time-Fourier-transform (STFT) can restore the transition-induced double peaks in the asymmetric and deformed BSS, thus offering more accurate and quicker measurements than the conventional Lorentz-fitting method. The recovering method based on the double-peak detection and corresponding BSS deformation can be applied to calculate the real starting point, which can improve the distance accuracy of the STFT-based BOTDR system.

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Strain sensing based on a core diameter mismatch structure

Fernandes

Giraldi

Sousa

et al. 2019

Micro & Optical Tech Letters

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In this paper, it is proposed and experimentally investigated a sensor structure based on a core diameter mismatch technique for strain sensing. An uncoated short section of multimode fiber is spliced between two standard single mode fibers forming the sensor structure, called the SMS (single‐mode‐multimode‐single‐mode) sensor. The proposed SMS sensor, in the strain analysis, generates destructive or constructive interference patterns as load or strain are applied, changing the power of the optical signal only, without varying the wavelength. The sensor configuration offers several motivating attributes, such as easy fabrication, low‐cost, high‐efficiency and high sensitivity, moreover allows interrogation of the optical signal using the transmitted or reflected total optical power. The results and these advantages indicate that the proposed SMS sensor device is suitable for strain measurement, which is helpful in a broad range of applications, for instance, structural health monitoring.

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On-specimen strain measurement with fiber optic distributed sensing

Cited by 45 publications

References 28 publications

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

Double peak-induced distance error in short-time-Fourier-transform-Brillouin optical time domain reflectometers event detection and the recovery method

Strain sensing based on a core diameter mismatch structure

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