1,721,087 research outputs found
Design and fabrication of fiber optic sensors and systems for aerospace applications
Full text linkThe rapid evolution of fiber optic technology has revolutionized the field of communication
and sensing, enabling unprecedented levels of accuracy, miniaturization,
and scalability. This thesis describes the results obtained during my Ph.D.
activity and concerning the development of fiber optic sensors, optical fiber
components, and light sources tailored to advance the field of aerospace structure
monitoring. The work has required the exploration of the research forefront in
this field.
The first part of the thesis focuses on the design, fabrication, and characterization
of non-conventional fiber optic sensors. These sensors leverage Bragg
gratings to detect several physical parameters, including temperature, strain, and
bending, matching the stringent requirement of structural health monitoring of
Carbon Fiber Reinforced Polymers (CFRP). The findings have been obtained in
collaboration with the University of Southampton (Optoelectronic Research
Centre - ORC, UK) trying to give a contribution to the ongoing evolution of
aerospace sensor technologies.
Bragg gratings are wavelength-selective structures also employed for multiplexing
optical signals or for the construction of laser cavities. By considering
these aspects and the growing interest in Medium-Infrared (Mid-IR) spectral
range, the second part of the thesis delves into the design, fabrication, and characterization
of Mid-IR optical fiber components, based on soft glasses, operating
between 0.5 μm and 12 μm. Optical fiber combiners/couplers are essential elements
in communication and sensing systems that enable the splitting (or combining)
of optical signals into (from) a single optical fiber preserving beam quality.
The development of a custom manufacturing procedure for fluoride and chalcogenide
glasses, in collaboration with the company Le Verre Fluoré (Bruz,
France) made it possible, for the first time, to address the results described in the
doctoral thesis.
Moreover, Bragg gratings in combination with these optical fiber components
allow the development of all-in-fiber Mid-IR amplifiers, lasers, and wavelength
division multiplexing (WDM) systems. In particular, optical fiber lasers, operating in the Mid-IR spectral range, can be employed for material inspection
purposes to assess the integrity and quality of composite materials via Non-Destructive
Testing (NDT) techniques. Therefore, the design and optimization of
Mid-IR continuous wave (CW) lasers, are reported in the last part of the Ph.D.
research work.
Part of the obtained results have been published in International Journals and
in the Proceedings of National and International Conferences, as listed at the end
of the thesis
High-repetition-rate picosecond pulse generation at 1.5 micron by intracavity laser frequency modulation
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Linearly polarized, single-frequency, widely tunable Er:Yb bulk laser at around 1550 nm wavelength
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Theoretical and experimental analysis of intensity noise in codoped erbium-ytterbium glass laser
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5-GHz repetition-rate dual-wavelength pulse-train generation from an intracavity frequency-modulated Er-Yb:glass laser
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