Author Affiliations

S. W. James,^1,* T. Kissinger,^1,2 S. Weber,^3,4,5 K. Mullaney,¹ E. Chehura,¹ J. H. Barrington,¹ H. H Pekmezci,^1,6 S. E .Staines,¹ T. O. H. Charrett,¹ N. J. Lawson,^3,7 M. M. Lone,^1,8 and R. P. Tatam¹

¹Engineering Photonics, Cranfield University, MK43 0AL, UK.

²Now with the Institute of Process Measurement and Sensor Technology, Technical University of Ilmenau, 98694 Ilmenau, Germany.

³Centre for Aeronautics, Cranfield University, Bedfordshire MK43 0AL, UK.

⁴Airbus Helicopters UK Ltd, Kidlington Oxfordshire OX5 1QZ, UK.

⁵Now with Airbus Helicopters Deutschland GmbH, Industriestrasse 4, 86609 Donauwöprth, Germany.

⁶Now with Arm-ECS Research Centre, University of Southampton, Southampton SO17 1BJ, UK.

⁷Now with School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia.

⁸Now with Lilium GmBH, Munich, Germany.

^*Corresponding author: s.w.james@cranfield.ac.uk