Influences of Pulse Parameters on the Performance of Double-Pulse Φ-Otdr

Xiang, Zhou; Chen, Xiaoshan; Cao, Hanyu; Deng, Huaxia; Ren, Jie; Xiao, Xingzhi; Sun, Yu; Ma, Mengchao

doi:10.2139/ssrn.4286586

Cited by 3 publications

(3 citation statements)

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“…The continuous light emitted by a narrow linewidth laser is divided into two parts by a 90/10 coupler. 90% of this continuous light enters an AOM to be modulated into pulsed signals with a frequency shift ∆f [28,29]. The AOM is driven by an arbitrary waveform generator.…”

Section: The Sensing Principle Of Dasmentioning

confidence: 99%

Research on partial discharge detection based on distributed optical fiber acoustic sensor

Sun,

Lv,

Xie

et al. 2024

Meas. Sci. Technol.

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Distributed acoustic sensors (DAS) have the advantage of long-distance and distributed monitoring of vibration signals. However, there are few studies on the application of DAS for partial discharge monitoring of power equipment. There is also a lack of related theoretical and methodological studies. In this paper, the DAS-measured phase signals are theoretically analyzed from the frequency and energy perspectives, and the method of partial discharge broadband signal coverage using spectrum and energy accumulation is proposed. Fiber optic rings are employed for the detection of partial discharge signals, and the precise localization of these signals is achieved by calculating the DAS energy spectrum. The fiber optic ring is wrapped around the cable joint to achieve the detection and locating of the partial discharge signal. The results indicate that the use of a fiber optic ring can realize the sensitive detection and locating of partial discharge. The signal strength is maximum when the length of the fiber ring is equal to the spatial resolution of DAS. The sensitivity of partial discharge detection in cable joints can reach 40 pC, and the simultaneous detection and localization of partial discharge at different locations can be realized. The research can provide support for theoretical and experimental for the monitoring of partial discharge in power equipment.

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Section: The Sensing Principle Of Dasmentioning

confidence: 99%

Research on partial discharge detection based on distributed optical fiber acoustic sensor

Sun,

Lv,

Xie

et al. 2024

Meas. Sci. Technol.

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show abstract

“…The continuous light is divided into two parts by the 90/10 coupler. The 90% part of it enters the acoustic-optic modulator (AOM, SGTF100-1550-1P) to modulate into a pulse signal with a frequency shift of ∆f = 100 MHz [21,22]. The AOM is driven by an arbitrary waveform generator (AWG) to generate repetitive laser pulses.…”

Section: The Working Principle Of φ-Otdr Coherent Detection Systemmentioning

confidence: 99%

Measurement and Evaluation Method of Distributed Optical Fiber Acoustic Sensing Performance

Xie,

Sun,

et al. 2024

Photonics

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Distributed acoustic sensing incorporates multiple indicators, and there exists a mutually constraining relationship among these indicators. Different application fields have varying requirements for indicators. Therefore, indicator testing and comprehensive evaluations are crucial for engineering applications. In this paper, we conducted a theoretical analysis of key indicators, including frequency response, sensitivity, spatial resolution, sensing distance, multi-point perturbation, and temperature influence. The indicator test scheme was developed, and a test system was constructed. The test data were analyzed and compared in the time-frequency domain. A performance evaluation method for distributed acoustic sensing, based on the analytic hierarchy process, is proposed, and a comprehensive evaluation example focused on high-frequency applications is presented. The results show that the test scheme and method presented in this paper can accurately measure the upper limits of each indicator of distributed acoustic sensing. The proposed comprehensive evaluation method enables the assessment of sensor performance and applicability based on engineering practices. It addresses the challenge of evaluating distributed acoustic sensing with multiple indicators and offers an efficient approach for equipment development and engineering applications.

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“…Current research efforts are dedicated to the simultaneous enhancement of these foundational system attributes. Currently, research on ϕ-OTDR is mainly focused on four aspects: extending sensing distance, improving spatial resolution, expanding frequency response range, and accurately identifying disturbances [9][10][11][12]. Among these, research on improving spatial resolution mainly centers on the use of pulse compression techniques [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

A Phase-Sensitive Optical Time Domain Reflectometry with Non-Uniform Frequency Multiplexed NLFM Pulse

Li,

Zhang,

Yuan

et al. 2023

Sensors

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In the domain of optical fiber distributed acoustic sensing, the persistent challenge of extending sensing distances while concurrently improving spatial resolution and frequency response range has been a complex endeavor. The amalgamation of pulse compression and frequency division multiplexing methodologies has provided certain advantages. Nevertheless, this approach is accompanied by the drawback of significant bandwidth utilization and amplified hardware investments. This study introduces an innovative distributed optical fiber acoustic sensing system aimed at optimizing the efficient utilization of spectral resources by combining compressed pulses and frequency division multiplexing. The system continuously injects non-linear frequency modulation detection pulses spanning various frequency ranges. The incorporation of non-uniform frequency division multiplexing augments the vibration frequency response spectrum. Additionally, nonlinear frequency modulation adeptly reduces crosstalk and enhances sidelobe suppression, all while maintaining a favorable signal-to-noise ratio. Consequently, this methodology substantially advances the spatial resolution of the sensing system. Experimental validation encompassed the multiplexing of eight frequencies within a 120 MHz bandwidth. The results illustrate a spatial resolution of approximately 5 m and an expanded frequency response range extending from 1 to 20 kHz across a 16.3 km optical fiber. This achievement not only enhances spectral resource utilization but also reduces hardware costs, making the system even more suitable for practical engineering applications.

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Influences of Pulse Parameters on the Performance of Double-Pulse Φ-Otdr

Cited by 3 publications

References 0 publications

Research on partial discharge detection based on distributed optical fiber acoustic sensor

Research on partial discharge detection based on distributed optical fiber acoustic sensor

Measurement and Evaluation Method of Distributed Optical Fiber Acoustic Sensing Performance

A Phase-Sensitive Optical Time Domain Reflectometry with Non-Uniform Frequency Multiplexed NLFM Pulse

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