Affiliation:
1. Beijing Laboratory of Optical Fiber Sensing and System, Beijing Information Science & Technology University
Abstract
Near-space airships are high-end
airships that are being
vigorously developed in the aerospace industry. It has important
application value in the telecommunication, surveillance, monitoring,
remote sensing, and exploration fields. The envelope is the key
component that provides lift to the airship. Online monitoring of
envelope status is critical to ensuring airship performance, safety,
and reliability. However, online monitoring of the 3D shape and strain
of the airship envelope is still a challenging task. A hybrid
multi-core and single-core fiber-optic monitoring method with a
temperature self-compensation function is proposed to address this
issue. The method uses multi-core fiber optic sensors, 3D curves, and
a surface reconstruction algorithm to obtain the 3D shape of the
envelope. Temperature decoupling of the sensing signal is carried out
via sensors on the central core of the multi-core fibers that are only
sensitive to temperature, thereby eliminating the influence of
temperature changes on the measurement accuracy. The strain field of
the envelope skin is measured by single-core fiber optic sensors and a
strain interpolation algorithm. The accuracy of the proposed method is
experimentally validated. The results show that the 3D shape
measurement error of the envelope skin is 4.82% when the skin is bent
in the range of
10
m
−
1
−
15.38
m
−
1
. When the ambient temperature changes
in the range of
−
50
∘
C
−
150
∘
C
, the position measurement error
caused by the temperature change is only 1.2% of the effective
measurement length (160 mm) of the multi-core fiber optic
sensor. When the skin is stretched in the range of
500
−
5000
µ
ε
, the measurement error of the average
value of the skin strain field is only 0.75%. This proves that the
proposed method can simultaneously measure the 3D shape and strain
field of the envelope skin and also effectively suppress the influence
of ambient temperature changes on the measurement accuracy. The
proposed method has application prospects in the online monitoring of
airship envelopes.
Funder
Beijing Municipal Natural Science
Foundation
Key Project of Beijing Municipal
Education Commission Science and Technology
Program
Beijing Nova Program
National Natural Science Foundation of
China
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
Cited by
1 articles.
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