Reducing Trade-Off Between Spatial Resolution and Frequency Accuracy in BOTDR Using Cohen's Class Signal Processing Method

Yao, Yuguo; Lu, Y.; Zhang, Xuping; Wang, Rui; Wang, Rugang

doi:10.1109/lpt.2012.2203299

Cited by 17 publications

(7 citation statements)

References 10 publications

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“…where P rp (τ) is the relative peak power of the measured BGS closely related with the width of the probe pulse. The relative SNR versus laser linewidth under different pulse widths was numerically simulated and is plotted in Figure 5a according to Equation (12). Further, the BFS measurement error was calculated based on Equation 1and normalized as shown in Figure 5b.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…Originally, a simple Levenberg-Marquart algorithm was used for BGS fitting [11]. Then, a series of time-frequency analysis methods called Cohen's class were proposed for the signal processing of BOTDR, reducing the BFS fluctuation by three times [12]. For improving both the measurement accuracy and data processing speed, a similarity matching method was proposed, making the standard derivation of BFS results three times better [13].…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Laser Linewidth on the Brillouin Shift Frequency Accuracy of BOTDR

et al. 2018

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This paper analyzes the influence of laser linewidth on the measurement accuracy of a frequency-scanning Brillouin optical time domain reflectometer (FS-BOTDR), allowing for both the width of Brillouin gain spectrum and the signal-to-noise ratio (SNR) of the BOTDR system. The measurement accuracy of the Brillouin frequency shift (BFS) is theoretically investigated versus the duration of the probe pulse and the linewidth of the laser source, by numerically simulating how a FS-BOTDR works and evaluating the Brillouin gain spectrum (BGS) width and the system SNR. The simulation results show that the BFS accuracy is improved as the laser linewidth becomes narrower when the probe pulse width is fixed. We utilize five types of lasers with respective linewidths of 1.05 MHz, 101 kHz, 10.2 kHz, 3.1 kHz, and 98 Hz to compare the BFS measurement accuracy over a ~10 km optical sensing fiber. The experimental results demonstrate that the root-mean-square error (RMSE) of BFS decreases with the laser linewidth narrowing from 1.05 MHz to 3.1 kHz, which is in good agreement with the numerical simulation. However, the RMSE of BFS increases when the laser linewidth is less than 3.1 kHz, which may arise from the coherent Rayleigh noise due to a too narrow laser linewidth. The results can provide a theoretical basis and experimental guidance for choosing the appropriate laser linewidth in BOTDR.

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Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of Laser Linewidth on the Brillouin Shift Frequency Accuracy of BOTDR

et al. 2018

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“…In DPP-BOTDA, a pair of pulses with a small difference of the pulse widths are successively launched into the FUT; the Brillouin interaction is recorded for twice and a subtraction is performed to achieve the sensing trace with the high spatial resolution determined by the small pulse-width difference. The spatial resolution of BOTDR has been also more or less improved by an experimental optimization or signal processing process [135][136][137]. Although BOTDA and BOTDR are excellent for long sensing range (such as kilometers or tens of km), they still suffer the physical limitation of maximum range due to the nature of fiber loss and/or the Brillouin depletion effect.…”

Section: System Improvement Of Sensing Techniquesmentioning

confidence: 99%

Brillouin Scattering in Optical Fibers and Its Application to Distributed Sensors

Zou¹,

Long²,

Chen³

2015

Advances in Optical Fiber Technology: Fundamental Optical Phenomena and Applications

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This chapter introduces the basic principle and recent advances of Brillouin scattering in optical fibers. The working mechanism, different interrogation techniques, difficulty or challenge of the sensing ability, and recent breakthroughs of Brillouin based distributed optical fiber sensors are demonstrated, respectively. 2. Brillouin scattering in optical fibers 2.1. Principle Light scattering phenomena in optical fibers occur regardless of how intense the incident optical power is. They can be basically categorized into two groups, i.e. spontaneous scattering and stimulated scattering[1]. Spontaneous scattering refers to the process under conditions such that the material properties are unaffected by the presence of the incident optical fields.

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“…The Brillouin frequency domain analysis (BOFDA) is a new technology for temperature and strain measurement. Using this type of distributed sensing technology, the parameters can be measured as a function of the length optical fiber sensor [1][2][3][4][5][6][7][8]. The strain and temperature distribution information of the entire optical fiber can be continuously measured and real-time display by BOFDA technology.…”

Section: Journal Of Sensorsmentioning

confidence: 99%

“…The output signal of detector is input to the network analyzer instrument that is based on the light baseband transmission function. The output signal ℎ( ) of network analyzer converted by the inverse fast Fourier transform contains the strain or temperature distribution information along the optical fiber sensor [6][7][8]. Figure 2 shows the principle of BOFDA system.…”

Section: Principle Of Bofdamentioning

confidence: 99%

Distributed Measurement of Temperature for PCC Energy Pile Using BOFDA

Gao

Kong

et al. 2015

Journal of Sensors

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PCC energy pile is a new technology for sustainable development of urban areas. Learning and understanding the temperature variation of PCC energy pile are very important to its development and application. In this study, the Brillouin optical frequency domain analysis (BOFDA) technology is firstly used to measure the temperature variation of PCC energy pile from a model test. The aim is to provide an optical fiber sensing method for monitoring the temperature distribution of PCC energy pile. When the temperatures of circulating water are 70°C, 60°C, 50°C, and 40°C, the result shows that the temperatures of PCC energy pile under different conditions are measured well by the optical fiber sensor. It will help to master the temperature distribution and thermomechanical characteristic of PCC energy pile. It can also provide the important scientific and theoretical basis for the design and application of PCC energy pile.

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Reducing Trade-Off Between Spatial Resolution and Frequency Accuracy in BOTDR Using Cohen's Class Signal Processing Method

Cited by 17 publications

References 10 publications

The Influence of Laser Linewidth on the Brillouin Shift Frequency Accuracy of BOTDR

The Influence of Laser Linewidth on the Brillouin Shift Frequency Accuracy of BOTDR

Brillouin Scattering in Optical Fibers and Its Application to Distributed Sensors

Distributed Measurement of Temperature for PCC Energy Pile Using BOFDA

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