Experimental validation of a Rayleigh backscattering based distributed fibre optical measurement system's thermo-elastic deformation measurement capabilities
Structural Health monitoring (SHM) is nowadays a quite promising approach to gather real-time information concerning several properties of a structure and of the operational environment surrounding it. Within this discipline, fibre optics are gaining attention due to some very interesting charact...
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| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2016
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/68658 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Structural Health monitoring (SHM) is nowadays a quite promising approach
to gather real-time information concerning several properties of a structure
and of the operational environment surrounding it. Within this discipline, fibre
optics are gaining attention due to some very interesting characteristics of
these devices. Being lightweight, small, flexible, embeddable, immune to
electric and magnetic fields, Fibre Optic Sensors are an appealing solution
for continuously assessing structural health conditions in order to prevent
costly repair and to possibly avoid failures.
Furthermore, in recent times, the possibility of creating a truly distributed
sensor using optical fibres is attracting a considerable and increasing
attentions from several different industrial fields.
This work focused on a Rayleigh backscattering Distributed Fibre Optic
Sensor system and on the comparison of it with more commonly used and
widespread measuring equipment, as strain gages, thermocouples,
photogrammetry and 3D image measurements, in order to properly
understand this system's behaviour and to evaluate its accuracy. Tests have
been performed to assess both strain and temperature measurement
capabilities, with an increasing level of experimental complexity.
The Fibre Optic Sensor worked properly and to a considerable level of
accuracy was achieved in the defined testing range. It has been found of
fundamental importance, in order to obtain accurate results, to properly
design and select the adhesive layer bonding the optical fibre to the host
structure as well as the additional coating required for temperature
measurements. Heat properties of the compound surrounding the fibre have
a considerable influence on temperature measurements, while viscoelastic
behaviours of the selected adhesive affect the sensor's strain readings. |
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