  We present spatial coherence measurements of partially coherent light in the
far-field of incoherent sources with an experimental setup based on the
Thompson-Wolf and Partanen-Turunen-Tervo experiments, to be performed in the
context of a possible solar coherence measurement space instrument. The optical
setup consists of a telescope to collimate light from a source, to diffract it
by a digital micromirror device implementing a Young double-aperture
interferometer in retroreflection mode, and finally to image the source into a
two-dimensional sensor. Two multimode optical fibers with different diameters
were used as incoherent sources and the results obtained for the spectral
degree of coherence are compared to those expected from the van Cittert-Zernike
theorem.
