Distributed dynamic strain measurement with a direct detection scheme by using a three-step-phase-shifted double pulse in a UWFBG array

Rui Hong; Feng Wang; Yong Yu; Wei Jiang; Yanqing Lu; Lin Zhang; Yixin Zhang; Xuping Zhang

doi:10.1364/ol.485414

Distributed dynamic strain measurement with a direct detection scheme by using a three-step-phase-shifted double pulse in a UWFBG array

Rui Hong, Feng Wang^*, Yong Yu, Wei Jiang, Yanqing Lu, Lin Zhang, Yixin Zhang, Xuping Zhang

^*Corresponding author for this work

College of Engineering and Physical Sciences

Research output: Contribution to journal › Article › peer-review

7 Citations (SciVal)

Abstract

We demonstrate a stable homodyne phase demodulation method with a double pulse based on an ultra-weak fiber Bragg grating (UWFBG) array. The technique divides one of the probe pulses into three sections and introduces successive 2π/3 phase differences into each section. By using a simple direct detection scheme, it can achieve distributed and quantitative vibration measurement along the UWFBG array. Compared to the traditional homodyne demodulation technique, the proposed technique is more stable and easier to accomplish. Moreover, the reflected light from the UWFBGs can provide a signal that is modulated uniformly by the dynamic strain and multiple results for averaging, resulting in a higher signal-to-noise ratio (SNR). We experimentally demonstrate the technique’s effectiveness by monitoring different vibrations. The SNR for measuring a generic 100 Hz, 0.08 rad vibration in a 3 km UWFBG array with a reflectivity of −40 to −45 dB is estimated to be ∼44.92 dB.

Original language	English
Article number	2090
Pages (from-to)	2090-2093
Number of pages	4
Journal	Optics Letters
Volume	48
Issue number	8
Early online date	11 Apr 2023
DOIs	https://doi.org/10.1364/ol.485414
Publication status	Published - 15 Apr 2023

Bibliographical note

Funding: National Natural Science Foundation of China (61975076, 62175100, U2001601); Qinglan Project of Jiangsu Province of China; The Key Technology R&D Program of Inner Mongolia Autonomous Region (2019GG374).
Copyright © 2023 Optica Publishing Group

Funding

Funding. National Natural Science Foundation of China (61975076, 62175100, U2001601); Qing Lan Project of Jiangsu Province; The Key Technology R&D Program of Inner Mongolia Autonomous Region (2019GG374). Disclosures. The authors declare no conflict of interest. Data availability. Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

Funders	Funder number
Key Technology R&D Program of Inner Mongolia Autonomous Region	2019GG374
National Natural Science Foundation of China	61975076, 62175100, U2001601
Qinglan Project of Jiangsu Province of China

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title = "Distributed dynamic strain measurement with a direct detection scheme by using a three-step-phase-shifted double pulse in a UWFBG array",

abstract = "We demonstrate a stable homodyne phase demodulation method with a double pulse based on an ultra-weak fiber Bragg grating (UWFBG) array. The technique divides one of the probe pulses into three sections and introduces successive 2π/3 phase differences into each section. By using a simple direct detection scheme, it can achieve distributed and quantitative vibration measurement along the UWFBG array. Compared to the traditional homodyne demodulation technique, the proposed technique is more stable and easier to accomplish. Moreover, the reflected light from the UWFBGs can provide a signal that is modulated uniformly by the dynamic strain and multiple results for averaging, resulting in a higher signal-to-noise ratio (SNR). We experimentally demonstrate the technique{\textquoteright}s effectiveness by monitoring different vibrations. The SNR for measuring a generic 100 Hz, 0.08 rad vibration in a 3 km UWFBG array with a reflectivity of −40 to −45 dB is estimated to be ∼44.92 dB.",

author = "Rui Hong and Feng Wang and Yong Yu and Wei Jiang and Yanqing Lu and Lin Zhang and Yixin Zhang and Xuping Zhang",

note = "Funding: National Natural Science Foundation of China (61975076, 62175100, U2001601); Qinglan Project of Jiangsu Province of China; The Key Technology R&D Program of Inner Mongolia Autonomous Region (2019GG374). Copyright {\textcopyright} 2023 Optica Publishing Group ",

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T1 - Distributed dynamic strain measurement with a direct detection scheme by using a three-step-phase-shifted double pulse in a UWFBG array

AU - Hong, Rui

AU - Wang, Feng

AU - Yu, Yong

AU - Jiang, Wei

AU - Lu, Yanqing

AU - Zhang, Lin

AU - Zhang, Yixin

AU - Zhang, Xuping

N1 - Funding: National Natural Science Foundation of China (61975076, 62175100, U2001601); Qinglan Project of Jiangsu Province of China; The Key Technology R&D Program of Inner Mongolia Autonomous Region (2019GG374). Copyright © 2023 Optica Publishing Group

PY - 2023/4/15

Y1 - 2023/4/15

N2 - We demonstrate a stable homodyne phase demodulation method with a double pulse based on an ultra-weak fiber Bragg grating (UWFBG) array. The technique divides one of the probe pulses into three sections and introduces successive 2π/3 phase differences into each section. By using a simple direct detection scheme, it can achieve distributed and quantitative vibration measurement along the UWFBG array. Compared to the traditional homodyne demodulation technique, the proposed technique is more stable and easier to accomplish. Moreover, the reflected light from the UWFBGs can provide a signal that is modulated uniformly by the dynamic strain and multiple results for averaging, resulting in a higher signal-to-noise ratio (SNR). We experimentally demonstrate the technique’s effectiveness by monitoring different vibrations. The SNR for measuring a generic 100 Hz, 0.08 rad vibration in a 3 km UWFBG array with a reflectivity of −40 to −45 dB is estimated to be ∼44.92 dB.

AB - We demonstrate a stable homodyne phase demodulation method with a double pulse based on an ultra-weak fiber Bragg grating (UWFBG) array. The technique divides one of the probe pulses into three sections and introduces successive 2π/3 phase differences into each section. By using a simple direct detection scheme, it can achieve distributed and quantitative vibration measurement along the UWFBG array. Compared to the traditional homodyne demodulation technique, the proposed technique is more stable and easier to accomplish. Moreover, the reflected light from the UWFBGs can provide a signal that is modulated uniformly by the dynamic strain and multiple results for averaging, resulting in a higher signal-to-noise ratio (SNR). We experimentally demonstrate the technique’s effectiveness by monitoring different vibrations. The SNR for measuring a generic 100 Hz, 0.08 rad vibration in a 3 km UWFBG array with a reflectivity of −40 to −45 dB is estimated to be ∼44.92 dB.

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DO - 10.1364/ol.485414

M3 - Article

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SP - 2090

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JO - Optics Letters

JF - Optics Letters

IS - 8

M1 - 2090

ER -

Distributed dynamic strain measurement with a direct detection scheme by using a three-step-phase-shifted double pulse in a UWFBG array

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