Long-period gratings for selective monitoring of loads on a wind turbine blade

L. Glavind; S. Buggy; J. Canning; S. Gao; K. Cook; Y. Luo; G. D. Peng; B. F. Skipper; M. Kristensen

doi:10.1364/AO.53.003993

Applied Optics
Vol. 53,
Issue 18,
pp. 3993-4001
(2014)
•https://doi.org/10.1364/AO.53.003993

Long-period gratings for selective monitoring of loads on a wind turbine blade

L. Glavind, S. Buggy, J. Canning, S. Gao, K. Cook, Y. Luo, G. D. Peng, B. F. Skipper, and M. Kristensen

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L. Glavind, S. Buggy, J. Canning, S. Gao, K. Cook, Y. Luo, G. D. Peng, B. F. Skipper, and M. Kristensen, "Long-period gratings for selective monitoring of loads on a wind turbine blade," Appl. Opt. 53, 3993-4001 (2014)

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Abstract

An optical fiber sensor based on long-period gratings (LPG) for selective measurements of flap- and edge-wise bending of a wind turbine blade is presented. Two consecutive LPGs separated by 40 mm interfere to improve resolution and reduce noise in a D-shaped fiber. The mode profile of the device was characterized experimentally to provide a model describing the mode couplings. The sensor was tested on a wind turbine blade.

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Parameterization of Intensity in the Regions
	Intensity in Core	Intensity in Cladding	Intensity in Air
$TM - {like}_{core mode}$	0.8	$0.2 - 1 \cdot η$	$1 \cdot η$
$TM - {like}_{core mode}$	0.8	$0.2 - 1 / 4 \cdot η$	$1 / 4 \cdot η$
$TM - {like}_{Cladding mode}$	0.1	$0.9 - 1 \cdot η$	$1 \cdot η$
$TM - {like}_{Cladding mode}$	0.1	$0.2 - 1 / 4 \cdot η$	$1 / 4 \cdot η$

Parameterization of Intensity in the Regions
	Intensity in Core	Intensity in Cladding	Intensity in Air
$TM - {like}_{Cladding mode}$	0.07	$0.93 - 0.5 \cdot η$	$0.5 \cdot η$
$TM - {like}_{Cladding mode}$	0.07	$0.93 - 2 \cdot η$	$2 \cdot η$

Parameterization of Intensity in the Regions
	Intensity in Core	Intensity in Cladding	Intensity in Air
$TM - {like}_{core mode}$	0.8	$0.2 - 1 \cdot η$	$1 \cdot η$
$TM - {like}_{core mode}$	0.8	$0.2 - 1 / 4 \cdot η$	$1 / 4 \cdot η$
$TM - {like}_{Cladding mode}$	0.1	$0.9 - 1 \cdot η$	$1 \cdot η$
$TM - {like}_{Cladding mode}$	0.1	$0.2 - 1 / 4 \cdot η$	$1 / 4 \cdot η$

Parameterization of Intensity in the Regions
	Intensity in Core	Intensity in Cladding	Intensity in Air
$TM - {like}_{Cladding mode}$	0.07	$0.93 - 0.5 \cdot η$	$0.5 \cdot η$
$TM - {like}_{Cladding mode}$	0.07	$0.93 - 2 \cdot η$	$2 \cdot η$

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Applied Optics