title: Absolute interferometer for three-dimensional profile measurement of rough surfaces.
abstract: We present a new interferometer system devised for surface-profile metrology with multiple two-point-diffraction sources that are made from a pair of single-mode optical fibers. The diffraction interferometer system performs an absolute profile measurement by projecting multiple fringe patterns on the object surface and then fitting the measured phase data into a global model of multilateration. Test measurement results demonstrate that the proposed profiling method is suited for rough surfaces with excessive surface irregularities, which are difficult to measure with conventional two-arm interferometers.
authors.affiliation: Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Science Town, Daejeon 305-701, South Korea.
authors.forename: Byoung-Chang
authors.initials: BC
authors.lastname: Kim
authors.forename: Seung-Woo
authors.initials: SW
authors.lastname: Kim