Repeatability precision error analysis of the distributed fiber optic strain monitoring

Luo, Linqing; Mei, Ying; Battista, Nicholas de; Kechavarzi, Cédric; Soga, Kenichi

doi:10.1002/stc.2768

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…Brillouin optical time-domain reflectors (BOTDR) are used to realize distributed optical fiber sensing by using the linear relationship of the Brillouin frequency shift (BFS) versus the change in temperature and strain [1]. It has wide applications [2,3], such as security monitoring of buildings [4], wells [5], marine structures [6], power cables, and traffic facilities [7,8].…”

Section: Introductionmentioning

confidence: 99%

High-Precision Measurement of Brillouin Frequency Shift in Brillouin Optical Time-Domain Reflectometer Based on Half-Peak Fitting Algorithm of Power Spectrum

Dong

Shan

et al. 2023

IEEE Access

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The Brillouin optical time-domain reflectometer (BOTDR) system, which is based on the Brillouin frequency shift (BFS) of the scattering spectrum, has been widely applied to monitor the temperature and strain in many fields. The measurement accuracy of the BFS directly affects the monitoring and location of the temperature change or strain events. In this study, the characteristics of the least-squares fitting optimal solution of the Brillouin power spectrum are theoretically investigated, and a half-peak fitting algorithm is proposed to measure the BFS with high accuracy and stability. In particular, it can precisely determine the double-peak spectrum and detect the position in the transition section of a temperature change or strain event. Furthermore, it can reduce calculation complexity and enhance measurement speed by dropping most of the data. For the fiber under test (FUT) with a length of 12-km, 200 groups of time-domain data were processed using a probe pulse of width 50 ns and sampling rate 1 GHz. The half-peak fitting algorithm increased the temperature measurement accuracy by ~1 fold, with ~20% calculation of full fitting. Meanwhile, it effectively eliminated the influence of minor peak in the doublepeak spectrum, and optimized the spatial resolution of the temperature change position to 0.1-m, which is the maximum limitation by sampling rate.

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Section: Introductionmentioning

confidence: 99%

High-Precision Measurement of Brillouin Frequency Shift in Brillouin Optical Time-Domain Reflectometer Based on Half-Peak Fitting Algorithm of Power Spectrum

Dong

Shan

et al. 2023

IEEE Access

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“…With a sensing distance of approximately 100 km [2] and a spatial resolution of several centimeters [3] (both the performance indicators are typically not reached simultaneously; they are usually inversely proportional), it has been widely used in underground and geotechnical engineering. Soga et al used DFOS for real-time measurement of the strains and temperatures of UDWs, geothermal energy piles, subway shafts, and tunnel structures, thus providing valuable field data for the health assessment of geotechnical structures [4][5][6][7][8]. Lienhardt et al [9] developed a DFOS-based system for monitoring side slopes, which had a precision of 0.01 mm m −1 .…”

Section: Introductionmentioning

confidence: 99%

Measuring height of poured concrete via fiber-optic temperature sensing

Tian

Zhu

Liu

et al. 2023

Meas. Sci. Technol.

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Currently, there is no automatic method available to measure the height of poured concrete during concreting of underground diaphragm walls (UDWs), and the conventional manual method interrupts the operation. To address this issue, a distributed fiber-optic sensing-based method for measuring the height of poured concrete during the concreting of UDWs was developed and successfully applied to the real-time measurement of the height of poured concrete. The proposed method was verified by performing a scale mode test, wherein an acrylic circular tube was used to simulate a UDW steel cage and a temperature-sensing fiber-optic cable was laid spirally to increase the spatial resolution of measurement to 0.1 m. The temperature distribution in the tube and real-time measurements of the height of the poured concrete during concreting were obtained. The proposed method was applied to the construction of a real UDW. A total of 3360 data points representing the spatiotemporal temperature distribution in the UDW steel cage were obtained. The results indicated that the temperature of the mud in the steel cage was approximately 25–26 °C when no concreting operation was performed and that the temperature of the concrete layer increased to approximately 28–31 °C during concreting. The height of the poured concrete was the boundary representing the transition from the temperature of the mud to that of the concrete, and the measurement precision reached ±0.5 m. The measurement results obtained via the proposed method were consistent with those obtained manually using a plumb bob, thus confirming the effectiveness of the proposed method for high-precision, real-time measurement of the height of poured concrete during the concreting of UDWs.

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“…The authors of [ 18 ] tested this method experimentally and improved it for applications with high strain gradients. In [ 19 ] the measurement error of a distributed type of FOS based on Brillouin scattering and optical reflectometry in the time domain is discussed. Such questions as: why the initial strain gradient increases the error of measurement of the subsequent reading of the strain increment and how to estimate the magnitude of such an error are considered.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Gradient Strain Fields with Fiber-Optic Sensors

Матвеенко

Kosheleva

Serovaev

et al. 2022

Sensors

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The results of measuring gradient strain fields by embedded or mounted point fiber-optic sensors based on Bragg gratings and distributed fiber-optic sensors based on Rayleigh scattering are discussed. Along with the experiment, the results of numerical modeling of strain measurement errors associated with the assumption of uniaxial stress state in the area of the embedded Bragg grating and measurement errors by distributed fiber-optic sensors associated with gage length are presented. Experimental results are presented for 3D printed samples and samples made of polymer composite material. The geometry of the samples was chosen based on the results of numerical simulations, and provides different variants of non-uniform strain distribution under uniaxial tension, including the variant in which the derivative of the strain distribution function changes its sign. A good agreement of numerical results and experimental data obtained by distributed and point fiber-optic sensors in areas where the derivative of the strain distribution function keeps a sign and an increase in the error of strain measurement results by distributed fiber-optic sensors in areas where this derivative changes sign are demonstrated.

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Repeatability precision error analysis of the distributed fiber optic strain monitoring

Cited by 5 publications

References 19 publications

High-Precision Measurement of Brillouin Frequency Shift in Brillouin Optical Time-Domain Reflectometer Based on Half-Peak Fitting Algorithm of Power Spectrum

High-Precision Measurement of Brillouin Frequency Shift in Brillouin Optical Time-Domain Reflectometer Based on Half-Peak Fitting Algorithm of Power Spectrum

Measuring height of poured concrete via fiber-optic temperature sensing

Measurement of Gradient Strain Fields with Fiber-Optic Sensors

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