Surface Defect Detection and Removal


The Aviation Services Research Centre (ASRC) at PolyU has created a system to automate the detection and repair of surface defects on engine components. This system can assess the size and location of any defects and use special tools to remove them based on the inspection results.

  • Surface Defect Detection and Removal 0
  • Surface Defect Detection and Removal 1
Commercialisation opportunities
IP licensing
Problem addressed

In the aircraft maintenance, repair, and overhaul (MRO) industry, it takes significant time and effort to inspect and repair minor dents and scratches on critical in-service components. These defects are typically manually removed using traditional dressing and blending. For components that are in poor condition, it may even take more than one shift to complete the repairs.

  • This is the first system to automatically detect and polish out surface defects in hard-metal and precision components.
  • The new surface scanning technology can identify defects on hard-metal and precision components using pre-set inspection criteria for damage depth and length. This is similar to adaptive machining technology, and much more advanced than operators using a magnifying glass to search for surface defects.
Key impact
  • Any surface damage will be automatically identified.
  • The result of the damage inspection is determined by a clear threshold of ‘good’ or ‘bad’, which is not decided by the operator. If a component is found to be ‘bad’, it is polished until it reaches an acceptable standard.
  • This is a simple and reliable system that avoids the need for very labour-intensive work. It does not require measurements of defects using gauge wires, and there is no need to produce a replica mould of the pitting or defect to measure it with a digital microscope. This helps avoid many steps that add no value.
  • Detection and dressing of light defects on metallic components.
The Hong Kong Polytechnic University (PolyU)

With over 80 years of proud tradition and ranking among the world’s top 100 institutions, The Hong Kong Polytechnic University (PolyU) aspires to be a leading university with world-class research and education.

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