Page 29 - Demo

27Sensor fusionSensor fusion refers to combining data from multiple sensor types to fully grasp a system%u2019s condition. In lift and escalator monitoring, one component of the sensor suite is FBG accelerometers, a type of sensor used to measure vibration. Prof. Tam and Dr Liu installed a series of FBG sensors along a single fibre optic cable to measure variables such as temperature, humidity, displacement, tilt and electrical signatures using a single laser beam. These sensors connect to transducers that convert changes in these variables into wavelength shifts in the FBG sensors. Each FBG sensor reflects a specific wavelength of light, while letting other wavelengths pass through. By measuring wavelength shifts, data can be collected from each FBG sensor. The collected data allow the system to develop a holistic view of the equipment%u2019s health. This helps identify complex problems that may not be obvious from a single sensor type, further improving the accuracy and reliability of predictive maintenance.PULSE OF THE CITY