Illustration of reaching a homogeneous illumination despite an off-centre position of NI-CU and a tilt angle between optical axis and FPA. Shown are the optical beam (green arrow), the slightly tilted FPA (yellow box), as well as NI-CU and the intensity of its illumination as colours and contours. The centre of the NI-CU emission coil is marked as a dashed line, the actual shaped beam is shown in blue. Left: flat reflector patch; the beam centre has the same orientation as the centre of the Lambertian reflection cone and is creating a substantial gradient across the tilted FPA. Right. 30° tilted reflector patch; the effect of 30° rotation along the cosine component of the reflection cone matches the angle of NI-CU relative to the FPA, creating a near-homogeneous illumination.