title: Low-coherence fiber-optic sensor with a large numerical aperture for topographic measurements.
abstract: We describe a compact fiber-optic setup for three-dimensional topometry. The measuring principle is based on low-coherence interferometry in combination with a confocal microscope. Integrating an optical arrangement based on compact disk optics together with fiber optics into one sensor yields a compact unit. The sensor has a numerical aperture of 0.45 and is suitable for measuring large surface slopes with high spatial resolution. Further, a depth measuring range of more than 1 mm can be achieved. The capabilities of our setup for three-dimensional measurements are demonstrated.
authors.forename: R
authors.initials: R
authors.lastname: Windecker
authors.forename: M
authors.initials: M
authors.lastname: Fleischer
authors.forename: H J
authors.initials: HJ
authors.lastname: Tiziani