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Optical metrology

Optimisation of Imaging Confocal Microscopy for Topography Measurements of Metal Additive Surfaces

Optical metrology
R&D Engineering Manager, Ph.D. in Optical Engineering, MSc in Photonics at Sensofar Metrology

Carlos has collaborated since 2010 on the development of confocal, interferometry and focus variation technologies at Sensofar, where he holds the R&D Engineering Manager position since 2018. His interests are Optomechanical Systems Design and Image Processing.
Its consolidated research work in optical engineering confer the Sensofar R&D group an outstanding position to always stay up-to-date in terms of innovation and the highest technological level.

President & CTO, Ph.D. in Physics (Optical Engineering) at Sensofar Metrology

Holder of several patents in the field of Optical Surface Metrology.
Technical committee member of the ISO 25178.
Co-founder of Sensofar in 2001.
Roger has been working since 1997 to the present at the Centre for Sensors, Instruments and Systems Development (CD6) as optical engineer researcher. From 2005 to the present is part of the TG WG16 committee of the ISO25178 standard which is applied in the field of equipment developed in Sensofar. Currently he holds the position of President and CTO at Sensofar Tech SL.

Optimisation of Imaging Confocal Microscopy for Topography Measurements of Metal Additive Surfaces
Lewis Newton, Aditi Thanki, Carlos Bermudez, Roger Artigas, Adam Thompson, Han Haitjema and Richard Leach


Additive manufactured surfaces, especially metal powder bed fusion surfaces, present unique challenges for measurement because of their complex topographies. To address these measurement challenges, optimisation of the measurement process is required. Using a statistical approach, sensitivity analyses were performed on measurement settings found on a commercial programmable array scanning confocal microscope. The instrument measurement process parameters were compared by their effects on three quality indicators: the areal surface texture parameter Sa, measurement noise, and number of non-measured points. An analysis was performed using a full factorial design of experiments for both the top and side surfaces of test surfaces made from Inconel 718 and Ti-6Al-4V using powder bed fusion. The results indicated that measurements of metal additive surfaces are robust to changes in the measurement control parameters for Sa, with variations within 5% of the mean parameter value for the same objective, surface, and measured area. The number of non-measured points and the measurement noise were more varied and were affected by the choice of measurement control parameters, but such changes could be predicted by the statistical models. The contribution offered by this work is an increased understanding of imaging confocal microscopy measurement of metal additive surfaces, along with the establishment of good practice guidance for measurements.

Other publications

Single-shot optical profiling to reconstruct surface topographies