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We report a fiber optic vibration sensor developed from a Fiber Bragg Grating (FBG) sensor. Three FBG vibration sensors are constructed and subjected to drop test, vibration test and mock train-railway positioning test. All the Bragg wavelengths of the sensors, as well as the Fast Fourier Transform (FFT) graphs are recorded by a computer via an FBG interrogator. Two commercial FBG vibration sensors...
A flexible, streamline and lightweight optical fibre connector-less interface composed of composite materials has been developed. Light is coupled in and out of the interface via a fibre launch system. A fibre Bragg grating (FBG) is embedded into the composite structure in order to investigate the optical performance of the interface. It is shown that an optical connection is maintained between the...
A simulation design was presented to optimise the model of long period grating based fibre devices. The simulation used a modified phase matching condition to better estimate the resonance wavelengths in the transmission profile. Experiments were conducted to verify the results obtained in the simulation. The experimental results matched closely with the simulations.
In this report, we carry out simulation and experimental investigations of directional coupler structures with different separations between the glycerin selectively infiltrated channel and silica core of a large mode area Photonic Crystal Fiber (PCF). We assess their coupling characteristics and the corresponding temperature sensing capabilities. The temperature sensitivities of the glycerin selectively...
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