Page 25 - Demo

23Power of Fibre Bragg Grating sensorsAt the heart of both predictive maintenance systems lies a revolutionary technology: Fibre Bragg Grating (FBG) sensors %u2013 special optical sensors that can detect tiny changes in their environment, such as vibrations or strain. Think of them as incredibly sensitive %u2018ears%u2019 that can listen to the %u2018heartbeat%u2019 of lifts and escalators. %u201cIn an escalator, for example, there can be up to 100 rollers,%u201d explains Prof. Tam. %u201cNormal wear and tear can lead to cracks or missing chunks on the surface, compromising their function. Some damage may be hidden under lubricant or paint, invisible to the naked eye. That%u2019s when FBG sensors are invaluable.%u201dThe system works by recognising that each part of a lift or escalator has its own unique %u2018vibration signature%u2019 when functioning properly. When a part starts to wear out or becomes damaged, its vibration changes %u2013 much like a change in its %u2018heartbeat%u2019. The FBG sensors detect these subtle changes, allowing maintenance teams to be alerted before a breakdown occurs. For escalators, the system%u2019s capabilities extend even further. The EIMS can detect when foreign objects such as coins or screws hit the comb plate, with each object creating a unique vibration pattern. In lifts, similar sensors monitor the health of suspension ropes and bearings, and even constantly check rope tension to ensure optimal performance.PULSE OF THE CITY