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We proposed a portable online Raman detection system with all fiber components, by inserting two large-diameter optical fibers respectively into each end of the inner metal-coated capillary for Raman excitation and signal collection simultaneously. The all fiber structure not only could enhance the interaction length between the excitation beam and the detecting material, but also provide a very effective...
This paper presents a brief review of recent research progress in the field of photonic microwave generation. Five different techniques including external modulation, optical injection locking, optical phase lock loop, optoelectronic oscillator and dual-mode laser are discussed with the emphases on the system implementation, as well as the advantages and challenges of these techniques in practical...
We investigated a nonadiabatically tapered microfiber refractive index sensor with an ultrashort waist length. Free spectral range (FSR) is one common issue in the interferometry-based sensors. Such sensors will not work properly once the resonant wavelengths shift over one cycle. It was found that the temperature and pulling speed are the crucial parameters to achieve a desired tapering profile....
The traditional nondestructive testing (NDT) method contributes greatly to aircraft structural safety and reliability. However, it also significantly increases operating expense, or leads to the decrease of the aircraftpsilas runtime because of the disassemble and reassemble of structural components. Aircraft structural health monitoring (SHM) is a new in-situ, online structure detection method which...
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