NDLI: High-speed quasi-distributed strain sensing based on time division multiplexing of fibre Bragg gratings

Content Provider	IET Digital Library
Author	Ma, L. Ma, C. Wang, Y. Wang, D. Y. Wang, A.
Abstract	A high-speed quasi-distributed fibre optic sensing technique for strain is proposed and a proof-of-concept experiment is performed. The sensing link is formed by multiple fibre Bragg gratings and interrogated by a pulsed broadband source. A dispersive unit is used to translate wavelength variations to time-delay changes to enable high-speed sensing capability. As the gratings can be weakly reflecting and nominally identical in their reflection spectra, this technique has the inherent capability of high-capacity multiplexing. Linear and repeatable static strain response was achieved with a strain–delay conversion factor of −3.37 ps/με and a resolution of 4.73 με. Dynamic strain was successfully measured at a sampling rate of 7 kHz and dynamic resolution of 0.2 με/√Hz was obtained.
Starting Page	643
Ending Page	645
Page Count	3
ISSN	00135194
Volume Number	52
e-ISSN	1350911X
Issue Number	Issue 8, Apr (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/52/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2015.4398
Journal	Electronics Letters
Publisher Date	2016-03-14
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Bragg Gratings Distributed Sensor Dynamic Strain Measurement Echelles Fibre Gyros Fibre Optic Sonsor Fibre Optics Gratings High-capacity Multiplexing High-speed Optical Technique High-speed Quasidistributed Fibre Optic Sensing Technique High-speed Technique (microsecond Or Shorter) Measurement of Mechanical Variables Mechanical Variables Measurement Multiple Fibre Bragg Gratings Proof-of-concept Experiment Pulsed Broadband Source Static Strain Response Strain Measurement Strain Sensing Strain Sonsor Strain–delay Conversion Factor Ultrafast Optical Technique
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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