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This paper describes a new approach to multi-parameter monitoring for electrical AC machines. It is demonstrated that speed, torque and temperature can be measured using optical fibres incorporating sensors in the form of fibre Bragg gratings (FBGs) distributed around the machine. One fibre can incorporate several FBGs and hence provide several measurements. Experimental results showing speed, torque,...
In this paper a sensor system for multi-parameter electrical machine condition monitoring is reported. The proposed FBG-based system allows for the simultaneous monitoring of machine vibration, rotor speed and position, torque, spinning direction, temperature distribution along the stator windings and on the rotor surface as well as the stator wave frequency. This all-optical sensing solution reduces...
This paper presents the results obtained from fibre Bragg grating (FBG) sensors integrated into a railway current-collecting pantograph for accurate measurement of contact force and contact location when it is subjected to various temperature conditions. The temperature change of the pantograph is simulated, at the industrial laboratory of Brecknell Willis in the UK, by changing the DC current applied...
A fibre optic-based relative humidity (RH) sensing system has been developed for assessing the qualities of housing insulation materials, based on a Polyimide (PI)-coated Fibre Bragg Grating (FBG) device. This forms the key moisture sensitive element, allowing a carefully-designed and packaged sensor system to be fabricated, evaluated and calibrated, creating the robustness and reusability needed...
Further to the previous investigation of four types of photonic crystal fibres (PCFs) for their respective force/pressure sensitivity and the conclusion made that the PCF with lower birefringence demonstrates higher force/pressure sensitivity, this work is focused on the investigation of the pressure/force sensitivities of any two joint PCFs when they are fusion-spliced together. To obtain an optimum...
Four types of photonic crystal fibres (PCFs) with different birefringence characteristics were evaluated and cross-compared on their corresponding sensitivities to transverse force as a function of fibre orientation and the magnitude of the applied external force. The results obtained show that PCFs of low birefringence are more sensitive than those of high birefringence (Hi-Bi) although the former...
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