Instrumentation & Measurement Magazine 24-4 - 56

Fig. 10. Effect of damage on the magnetic field of the steel plate in the numerical modelling: (a) 14 mm cracks, (b) 34 mm cracks, and (c) 54mm cracks.
or virtually connect through the Internet, smartphone sensors
can be assembled into different sensing networks. In
particular, since the smartphone sensors are enabled by the
Apps in wirelessly connected smart devices, it is feasible to
continuously upload and share the sensing data with other
smart devices in the networks, such that the sensing data
from one smartphone can be analyzed to predict the potential
damages that may happen to other structures in the
networks. In addition, AI techniques can be applied in the
Apps to efficiently address real-time detection data from
the reported smartphone
sensors [30]-[32].
Fig. 11. Effect of measurement distance on the detected magnetic field in the numerical study.
56
IEEE Instrumentation & Measurement Magazine
Conclusions
This paper presents a magnetic
sensing technique for
SHM of steel plates. The
method is based on using
smartphone magnetometer
sensors to measure the
changes of the magnetic
flux due to damage progression
in structures. A
series of experimental and
numerical studies are carried
out on steel plates to
validate the performance
of the proposed approach.
The results indicate that
the sensing technique
is capable of accurately
June 2021

Instrumentation & Measurement Magazine 24-4

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