Distributed temperature sensing in OPGW with multiple optical fibres

Carvalho, Renatto Vaz; Bonfim, Marlio; Ussuna, Daniel A.; Toledo, Luiz Felipe Ribeiro Barrozo; Martins, Rafael; Filho, Vitoldo Swinka

doi:10.1049/iet-smt.2018.5319

Cited by 10 publications

(6 citation statements)

References 11 publications

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“…Moreover, the temperature accuracy/resolution is calculated by considering exponential fit of the obtained temperature profiles versus fibre length [32]. Figures 5,6 These above-mentioned results show that the sensing accuracy/resolution is degraded with increasing sensing range. In addition, the spatial resolution is observed as theoretical and simulated values of the proposed sensor.…”

Section: A New Hankel Matrix H Xmentioning

confidence: 87%

“…One of the major advantages in distributed fibre sensor over traditional point sensor is that it can be used as a real-time and continuous measurement system for monitoring the measurands. It is a high-tech instrument for real-time measurement of temperature field [5][6][7]. In the field of public safety and industrial process monitoring, it has become a new detection method.…”

Section: Introductionmentioning

confidence: 99%

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Sensing accuracy enhancement of long‐range distributed fibre‐optic temperature sensor using hybrid algorithm

Pradhan

2021

IET Science Measure & Tech

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This paper presents a long-range distributed fibre-optic temperature sensor with high sensing accuracy to monitor temperature using Brillouin scattering mechanism. Fourier deconvolution, Fourier wavelet regularised deconvolution, dichotomised singular value decomposition and hybrid algorithms were employed to measure the temperature of proposed sensor. Optical time domain reflectometry technique is used to extract the temperature profile for 70, 60 and 50 km sensing ranges. The improvement of temperature accuracy using hybrid algorithm is achieved for 70 km sensing distance. In order to extract temperature information, the numerical simulation process has been incorporated in the proposed long-range sensing system. Moreover, the temperature accuracy of the proposed system is obtained using Fourier deconvolution, Fourier wavelet regularised deconvolution, dichotomised singular value decomposition and hybrid algorithms for 70, 60 and 50 km sensing ranges. The simulation results show that the temperature accuracy is observed as 4.8 • K using hybrid algorithm compared to Fourier deconvolution algorithm that shows temperature accuracy as 14 • K at 70 km. In the proposed sensor, a spatial resolution of 20 m is observed for a sensing range of 70 km using hybrid algorithm. In addition, the denoising competence of the proposed hybrid algorithm is validated using 50 km optical time domain reflectometry backscattered trace observed experimentally. Further, a peak dynamic range improvement of optical time domain reflectometry backscattered trace as 3.91 dB is observed using hybrid algorithm.

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Section: A New Hankel Matrix H Xmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Sensing accuracy enhancement of long‐range distributed fibre‐optic temperature sensor using hybrid algorithm

Pradhan

2021

IET Science Measure & Tech

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“…This technique boasts several advantages, including distributed measurement, single-ended detection, long-distance capabilities, corrosion resistance, robustness against interference, strong implantability, and user-friendly operation. Thus, this technology has been found widespread application in the fields of perimeter security, power safety, aerospace, and more [1], [2], [3]. However, the distributed fiber optic sensing system based on Brillouin scattering faces challenges such as weak backscattered signals, limited stress measurement range, lengthy measurement time, and crosssensitivity among the measured parameters [4].…”

Section: Introductionmentioning

confidence: 99%

Research on Distributed Fiber Optical Strain Testing Technology Based on the Adam Algorithm

Duan,

Liu,

et al. 2024

IEEE Photonics J.

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Distributed Optical Fiber Sensing Technology, with advantages such as long detection distance, resistance to electromagnetic interference, and easy maintenance, is widely applied in various fields including security monitoring, electrical safety, and aerospace. However, the current Distributed Optical Fiber Sensing Technology faces challenges such as short localization distance, limited range for stress measurement, low accuracy, and time-consuming processes. This study proposes a novel approach for extracting Brillouin frequency shift signals using an adaptive gradient descent algorithm (Adam Algorithm). A Brillouin strain testing system based on heterodyne coherent detection is also constructed. Experimental results show that the distributed strain testing system using the Adam Algorithm can achieve accurate and fast measurement of maximum strain up to 9500με within a range of 10 kilometers. The average strain measurement deviation is 32.88με, and the time required for frequency shift extraction is less than 18.5ms. This method provides a theoretical and experimental basis for the application of BOTDR Distributed Optical Fiber Sensing Technology.

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“…In distributed optical fiber sensing, the optical fiber is used as both a sensing element and a transmission medium, and the cost per unit distance is greatly reduced. Therefore, DTS is widely used and implemented in a variety of application areas such as electric power, 3 – 5 petrochemical, 6 large-scale infrastructure construction, 7 – 10 and other fields.…”

Section: Introductionmentioning

confidence: 99%

Improved wavelet modulus maximum method for distributed optical fiber temperature sensing

Zhang

Yan

et al. 2022

Opt. Eng.

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The temperature measurement accuracy of the Raman distributed optical fiber temperature sensing system is an important metric. Aimed at the reduction of the temperature measurement error, which is caused by the noises in the sensor system, an improved wavelet modulus maximum method, which combine the 3sigm criterion with the traditional wavelet modulus maximum algorithm is proposed. In this proposed algorithm, the 3sigm value is used as the threshold for the highest decomposition layer of the wavelet modulus maximum method to judge whether it is a signal or noise, instead of using the ratio of the modulus maximum of the highest decomposition level to the number of decomposition levels to determine the threshold. We conduct distributed temperature measurement on a 10-km long multimode fiber, and analyze the experimental data by using the improved algorithm. The results show that the temperature measurement fluctuation obtained by improved method is 0.497°C on average. It is better than the 1.13°C that is obtained by the traditional wavelet modulus maximum algorithm. Compared with the traditional algorithms, the 3sigm criterion algorithm has improved the temperature measurement accuracy significantly. The improved algorithm provides a new idea for the selection of the threshold value, which makes the threshold selection more statistically.

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Distributed temperature sensing in OPGW with multiple optical fibres

Cited by 10 publications

References 11 publications

Sensing accuracy enhancement of long‐range distributed fibre‐optic temperature sensor using hybrid algorithm

Sensing accuracy enhancement of long‐range distributed fibre‐optic temperature sensor using hybrid algorithm

Research on Distributed Fiber Optical Strain Testing Technology Based on the Adam Algorithm

Improved wavelet modulus maximum method for distributed optical fiber temperature sensing

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