Andrei is focused on research and development of optical metrology instrumentation for high precision measurement and non-destructive testing of aerospace and civil materials and structures. The objective is to numerically characterise material behaviour during mechanical, impact, vibrational tests or during material ageing or degradation. Projects include measurement of deformation during an impact event, non-destructive inspection of thick composite materials, a drone-based inspection. Most of the developments lead to new instrumentation which broadens the capabilities of experimental mechanics.
Andrei is also involved in monitoring and preservation of cultural heritage objects when integrity or composition analysis is done with the techniques that are normally used for industrial inspection, e.g. laser shearography.
Andrei is responsible for the Delft Sirius Laser Facility, which is a 1 kW excimer laser operating at 308 nm. The facility is open for commercial and research activities. The laser can drill many types of materials, including composites and metals, with hole sizes are in the range 10 µm to 1 mm. The power and beam profile are adjustable for material modification and drilling of sample hole patterns across samples up to 1 m length.
Scientific interests:
- Speckle interferometry and shearography
- Multiple view computer vision, image processing
- Fusion of experimental and inspection data
Expertise:
- Development of optical metrology instrumentation from TRL 0 to 6
- Multimodal sensing and non-destructive evaluation
- Evaluation of damage and structural behaviour
Models and equipment:
- 3D shape shearography, pulsed laser shearography for studying impact events, a portable shearography instrument
- Visible light and NIR hyperspectral imaging
- Delft Sirius Laser Facility (1 kW, 308 nm excimer laser)
- Non-destructive testing and inspection equipment
