Interferometry with Vortices

Figure 4

The position of the vortex points (expressed in pixel number) as measured without the wedge (circles) and with the wedge (crosses), (a) wedge inserted horizontally, (b) wedge inserted at 𝛽=45^∘, (c) wedge inserted vertically as presented in the right corners. Deflection angle 𝛼=20 arcsec.

(a)

(b)

(c)