Magdalena Mieloszyk, Katarzyna Majewska, Wieslaw Ostachowicz
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10972/109720Z/THz-spectroscopy-application-for-analyzes-of-internal-structure-damage-due/10.1117/12.2513265.short?SSO=1
Glass composite structures are recently very
popular in many branches of industry, such as marine (e.g. ship hull), civil
engineering (e.g. composite bridge deck) or energy (e.g. wind turbine blades).
Due to high safety requirements related to the objects structural health
monitoring systems based on fiber optics techniques are recently widely
applied. One of problems that can influence on material durability is moisture
introduced into element structure during its manufacturing or exploitation
processes. Moisture changes material characteristics, affect element durability
and can be a damage origin especially during exposure on negative temperature
influence. One of the non-destructive techniques that can be applied for
evaluation of internal structure of non- conductive materials (like glass fiber
reinforced polymers) is THz spectroscopy. This method can be used for
identification of material structural disintegrations that results in changes
of absorption coefficient, refractive index or scattering of THz waves
propagating throughout analyzed material. The paper presents an application of
THz spectroscopy for inspection of glass composite samples internal structure.
The method was used for evaluation of internal material structure as well as
detection, localization and determination of size of internal damage due to
influence of moisture and exposure on negative temperature. During analysis the
limitations of proposed method will be determined.
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