Fig. 4
From: Passive sensing around the corner using spatial coherence
Distance recovery from coherence measurements. a The object-to-wall distance is z1 = 80cm, the angle of incidence is θ = 80°, and the complex spatial coherence function of the scattered field is measured at z2 = 100 cm from the diffusing wall. The coherence detector (DuPSaI) was translated up to 4 cm from the optical axis as indicated. b Two-dimensional phase map of the measured coherence function corresponding to different transversal position of DuPSaI, the phase measurement that was used to recover the total distance to the target is represented by the dotted line
