Co-Phased 360-Degree Profilometry of Discontinuous Solids with   2-Projectors and 1-Camera
  Here we describe a co-phased 360-degree fringe-projection profilometer which uses 2-projectors and 1-camera and can digitize discontinuous solids with diffuse light surface. This is called co-phased because the two phase demodulated analytic-signals from each projection are added coherently. This 360-degree co-phased profilometer solves the self-generated shadows cast by the object discontinuities due to the angle between the camera and the single white-light fringe projector in standard profilometry. 
Manuel Servin, Guillermo Garnica and J. M. Padilla
physics.ins-det physics.optics