Distributed and dynamic strain sensing with high spatial resolution and large measurable strain range

Li Zhang; Zhisheng Yang; Nachum Gorbatov; Roy Davidi; Malak Galal; Luc Thévenaz; Moshe Tur

doi:10.1364/OL.395922

Distributed and dynamic strain sensing with high spatial resolution and large measurable strain range

Li Zhang^*, Zhisheng Yang, Nachum Gorbatov, Roy Davidi, Malak Galal, Luc Thévenaz, Moshe Tur

^*Corresponding author for this work

School of Electrical Engineering

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

Abstract

A distributed and dynamic strain sensing system based on frequency-scanning phase-sensitive optical time domain reflectometry is proposed and demonstrated. By utilizing an RF pulse scheme with a fast arbitrary waveform generator, a train of optical pulses covering a large range of different optical frequencies, short pulse width, and high extinction ratio is generated. Also, a Rayleigh-enhanced fiber is used to eliminate the need for averaging, allowing single-shot operation. Using direct detection and harnessing a dedicated least mean square algorithm, the method exhibits a record high spatial resolution of 20 cm, concurrently with a large measurable strain range (80 µε, 60 demonstrated), a fast sampling rate of 27.8 kHz (almost the maximum possible for a 55 m long fiber and 60 frequency steps), and low strain noise floor (<1.8

and <0.7 nε/^√Hz for higher frequencies).

Original language	English
Pages (from-to)	5020-5023
Number of pages	4
Journal	Optics Letters
Volume	45
Issue number	18
DOIs	https://doi.org/10.1364/OL.395922
State	Published - 15 Sep 2020

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abstract = "A distributed and dynamic strain sensing system based on frequency-scanning phase-sensitive optical time domain reflectometry is proposed and demonstrated. By utilizing an RF pulse scheme with a fast arbitrary waveform generator, a train of optical pulses covering a large range of different optical frequencies, short pulse width, and high extinction ratio is generated. Also, a Rayleigh-enhanced fiber is used to eliminate the need for averaging, allowing single-shot operation. Using direct detection and harnessing a dedicated least mean square algorithm, the method exhibits a record high spatial resolution of 20 cm, concurrently with a large measurable strain range (80 µε, 60 demonstrated), a fast sampling rate of 27.8 kHz (almost the maximum possible for a 55 m long fiber and 60 frequency steps), and low strain noise floor (<1.8and <0.7 nε/√Hz for higher frequencies).",

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AU - Zhang, Li

AU - Yang, Zhisheng

AU - Gorbatov, Nachum

AU - Davidi, Roy

AU - Galal, Malak

AU - Thévenaz, Luc

AU - Tur, Moshe

PY - 2020/9/15

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Distributed and dynamic strain sensing with high spatial resolution and large measurable strain range

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