SAMPE Journal - May/June 2020 - 22
FEATURE
Fiber
Optic
Sensing
Close-up of very high definition fiber optic sensors mounted on composite laminate structure
while in-use as a strain sensor for material and
structural characterization during loading.
(Courtesy Luna Innovations)
A Fully Distributed Strain Rosette Using High
Definition Fiber Optic Sensing
Elias D. Bearinger, Dan Kominsky, Reginald L. Bryson, Nur Aida Abdul Rahim
Luna Innovations Inc.
Blacksburg, VA
I
ABSTRACT
ntegration of new materials into critical structures and applications has driven the need for using strain profiles to
characterize material behavior, conduct structural health monitoring, and enable in-situ non-destructive evaluation to drive condition-based maintenance. Due to their small size, flexibility, and low weight, High-Definition Fiber
Optic Sensors (HD-FOS) have been frequently utilized for highly spatially-resolved strain measurements with a
sampling spacing of 0.65 mm on a wide variety of materials and complex part geometries. HD-FOS, like many
fiber optic sensors, is primarily sensitive to strain along the length of the fiber, making it impossible to accurately
determine principal and shear strains with a single straight sensor. This work demonstrates how a single fiber can
be configured into a rosette geometry, allowing planar and shear strains to be fully characterized. New research
has shown that by arranging a single fiber optic sensor in an extended rosette pattern, distributed principal strains
and their orientations can be determined at any location within the pattern. This research focused on integrating
fiber optic sensors into composite structures and culminated with embedding a distributed rosette pattern into a
composite helicopter rotor blade. The rotor blade was shown to be effective in measuring distributed strains on
the order of ±500 microstrain along its curved surfaces, resulting in a highly-desirable smart structure capable of
measuring its own mechanical integrity.
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SAMPE Journal - May/June 2020
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