Fibre Bragg gratings
An investigation of phase mask diffraction patterns and fibre Bragg gratings with scanning near field optical microscopy
... There are several experiments that could be implemented as a natural progression to the work begun here. For example, the phase errors that were identified could be examined further. The direct imaging of the phase ...
175
Detection of delaminations based on dynamic behavior : application of fibre bragg gratings for dynamic damage detection
... T his thesis investigated the possibilities of on line health monitoring based on dy- namic behaviour. A literature survey described the research done in this field. Var- ious techniques based on resonance frequencies, ...
109
Simulation of dual fibre Bragg gratings as a fabry-perot tunable filter
... The objective of this research is to fabricate a single and dual fibre Bragg gratings in the core of an optical fibre by using the phase mask technique. The characteristics of FBG will be ...
21
The use of fibre Bragg gratings for ultrasonic Lamb wave detection and source location
... defects. Fibre Bragg gratings offer some significant advantages over more traditional transducers such as piezoelectrics for ultrasound detection and are also dual purpose, since the same sensors can ...
6
Greater than 90nm continuously wavelength tunable fibre Bragg gratings
... how fibre Bragg gratings (FBGs) have developed into some of the most suitable devices for selecting DWDM signals with channel spacing as low as 25GHz [1], owing to the almost arbitrary design ...
6
Application of fibre Bragg gratings for the optimization of microwave-cured concrete
... ‘intelligent’ fibre Bragg gratings (FBGs) as sensors for the temperature feedback control of concrete cured in a microwave environment has been presented and experimentally ...
5
Microscopic and spectral characterisation of optical Fibre Bragg gratings
... sensors, fibre Bragg gratings suffer an inherent cross-sensitivity between temperature and ...the fibre path can lead to unrepresentative, thermal-induced strain readings ...two fibre ...
210
Multi-parameter monitoring of electrical machines using integrated fibre Bragg gratings
... optical fibre-based, quasi-distributed, sensing system in electrical machines for real-time ...the fibre sensors’ reduced spatial envelope and immunity to electromagnetic ...
5
Pitch and roll sensing using fibre Bragg gratings in multicore fibre
... were the input fibres to the single-core to multicore fibre fan-out. The reflected light from each core was incident on four photodetectors (PD1–4) with negligible cross-talk between these channels due to the high ...
6
Fibre Bragg gratings for dispersion compensation in optical communications
... In the majority of the reported results, linearlychirped fibre gratings were used as dispersion compensatorsin a single location along the fibre 1s However,numericalcalculationshave show[r] ...
5
Smart Fibre 'Bragg Grating' Feasibility Retrofitting Assessment in Nuclear Power Plant Structures (O577)
... of fibre Bragg gratings in civil structure ...install fibre optic sensing systems on civil structures that can monitor both static and dynamic loads has been reported in connection with ...
8
Passive and active Bragg gratings for optical networks
... en/decoders and the tunable fibre Bragg gratings based on an S-bending technique. Three types of FBGs based optical phase en/decoders, including conventional discrete- phase en/decoders, new ...
177
Intrinsic Fabry-Perot Sensors for Magnetic Field Detection
... Optical fibre sensing techniques have seen a surge in promulga- tion and research advances in recent years, due to their immunity to electromagnetic radiation and compact ...that fibre Bragg ...
5
FBG-based fibre-optic current sensors for power systems protection : laboratory evaluation
... As an alternative to the use of CTs for conversion of current to a measurable voltage, magnetostrictive materials could be employed to enable the straining of fibre Bragg gratings directly by the ...
5
An outdoor fibre bragg grating temperature sensor
... FBG sensors are dielectric and virtually immune to electromagnetic interference (EMI). It can withstand against hostile environment, including in high and excessive temperature. It can be used to measure high ...
27
Wavelength stability in a hybrid photonic crystal laser through controlled nonlinear absorptive heating in the reflector
... in Bragg gratings are much lower than those in PhC cavities, the dependence of the emitted wavelength of such a laser on the output power is much weaker (and typically linear), implying that an ...
7
A novel idea of using soliton in fiber bragg grating
... Uniform Bragg grating reflectivity 17 ...Fiber Bragg Grating 21 2.7.1 Internal Inscription of Bragg Gratings 21 ...of Bragg Gratings 23 ...
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Analysis and Design of All-Optical Switching in Apodized and Chirped Bragg Gratings
... the Bragg gratings is widely used, discussed in literature and applied for optical signal processing ...by Bragg gratings because of important role in optical ...
16
Effects of random phase and amplitude errors in optical fiber Bragg gratings
... In this paper, we have studied the effects of random phase and amplitude errors in the performance of optical filters based on fiber Bragg gratings.. The amount of random phase errors in[r] ...
12
Ultrafast optical switching using parity time symmetric Bragg gratings
... 0.013, operation above the CPAL point, for two different TLM models, i.e., with and without gain saturation model. As can be seen, without a built-in gain saturation model there is an exponential growth of field ...
11