Long-Range Distributed Vibration Sensing Based on Phase Extraction From Phase-Sensitive OTDR

Yang, Guangyao; Fan, Xinyu; Wang, Shuai; Wang, Bin; Liu, Qingwen; He, Zuyuan

doi:10.1109/jphot.2016.2552820

Cited by 88 publications

(32 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This technique was validated by Tu et al (Tu 2015) and later by Yang et al (Yang 2016). The experimental results published by Yang et al showed that this sensing technique is capable of spatially resolving 1kHz dynamic strains along 30km of sensing fibre with a spatial and strain resolution of 10m and 50nε, respectively.…”

Section: C) Electrical-domain Techniquementioning

confidence: 90%

High Frequency Distributed Optical Fibre Dynamic Strain Sensing: A Review

Masoudi¹

2017

Proceedings

View full text Add to dashboard Cite

Section: C) Electrical-domain Techniquementioning

confidence: 90%

High Frequency Distributed Optical Fibre Dynamic Strain Sensing: A Review

Masoudi¹

2017

Proceedings

View full text Add to dashboard Cite

“…X. Fan et al have demodulated the phase information successfully by Hilbert transform, and deeply studied the noise of phase [18][19]. F. Pang et al have obtained the spatial distribution characteristic of the statistical phase in the coherent Φ-OTDR system when the phase demodulation is used to resolve the fading discrimination [20].…”

Section: Introductionmentioning

confidence: 99%

Quantitative characteristic of phase signal with changed pulse in the coherent PHI-OTDR system

Zhong¹,

Zhang²

2020

Preprint

View full text Add to dashboard Cite

In the coherent -OTDR system, the phase signal is retrieved based on the reference point and the observation point which are off and closer to the two sides of step of the phase change. In the experiment, the optical pulse with the changed peak power, width or shape is injected into the fiber for interrogating the change of the quantitative characteristic of the measured phase signal. When the pulse width is fixed at 200 ns and its peak power is adjusted from 14 dBm to -23 dBm, the amplitude is slightly increased from 17.3575 rad to 17.4411 rad as long as the Rayleigh backscattering signal can be found in the electrical signal. Changing the pulse width from 260 ns to 80 ns when the peak power is fixed at 14 dBm, the maximum amplitude and the minimum amplitude of the measured phase signal are 17.4625 rad to 17.4509 rad, respectively. When the arbitrary shape of the optical pulse generated from the MZI structure with a changed delay fiber from 3 m to 6 m, the amplitude varies from 17.4558 rad to 17.4819 rad. For every measurement, the change of frequency is also small. And the small value of standard deviation supports the accuracy of the measurement. All the measurements show that the changed pulse nearly has no impact on the quantitative characteristic of the measured phase signal in the coherent -OTDR system.

show abstract

“…Thus, precisely demodulating the phase of the reflected lightwave is the key to solve for the distributed perturbation along an optical fiber. A number of demodulation methods have been proposed in the past [12][13][14][15][16][17]. A. Masoudi and M. Belal used a 3×3 coupler to measure multiple dynamic perturbations along a 1 km fiber [16].…”

Section: Introductionmentioning

confidence: 99%

“…Y. Dong proposed a quantitative measurement system using I/Q demodulation method [13]. G. Yang developed a vibration sensing technique based on Φ-OTDR using Hilbert transform, which is able to measure dynamic strain at a frequency as low as 30 Hz [14].…”

Section: Introductionmentioning

confidence: 99%

Interrogation of Ultra-Weak FBG Array Using Double-Pulse and Heterodyne Detection

Liu

Wang

Zhang

et al. 2018

IEEE Photon. Technol. Lett.

View full text Add to dashboard Cite

A high performance interrogation method for ultra-weak FBG (UWFBG) using double-pulse and heterodyne detection method is proposed. The perturbation along the UWFBG array is located quickly through the use of double-pulsed optical input waveform. Then the perturbation of fiber is quantified precisely by demodulating the phase of differential signals from a heterodyne configuration. The efficiency of measuring the perturbation is improved by more than 20 times than that of using single probe pulse. In comparison with conventional Rayleigh scattering based approach, the proposed method is supreme in signal-to-noise ratio (SNR), approximately 18 dB higher. The use of differential signaling method can effectively remove the influence from frequency drift of the laser source, making this proposed method capable of measuring low frequency vibration. In our experiment, perturbations with both sinusoidal and triangle waveform were generated to quantitatively evaluate the performance of the proposed method. The minimum detectable fiber length variation is 14.85 nm, and the sensing frequency can be as low as 0.2 Hz.

show abstract

Long-Range Distributed Vibration Sensing Based on Phase Extraction From Phase-Sensitive OTDR

Cited by 88 publications

References 20 publications

High Frequency Distributed Optical Fibre Dynamic Strain Sensing: A Review

High Frequency Distributed Optical Fibre Dynamic Strain Sensing: A Review

Quantitative characteristic of phase signal with changed pulse in the coherent PHI-OTDR system

Interrogation of Ultra-Weak FBG Array Using Double-Pulse and Heterodyne Detection

Contact Info

Product

Resources

About