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Q: Quantenoptik
Q 34: Optical Applications I
Q 34.5: Vortrag
Freitag, 6. April 2001, 17:00–17:15, H 3010
Fast three-dimensional topometry using pulsed holography — •Jens Bongartz1,2, Dominik Giel1,2, and Peter Hering1,2 — 1Research center caesar, Friedensplatz 16, 53111 Bonn — 2Institute of Laser Medicine, University of Düsseldorf,Universitätsstraße 1, 40225 Düsseldorf
Taking a pulsed hologram (duration 20 ns) of a opaque object allows instantaneous recording of its 3D surface information to the holographic plate. An appropriate cw-laser reconstructs this information as the holographic real image. Moving a screen through the real image slices this volume into a series of 2D projections which are captured and digitzed. Suitable algorithms can extract the object’s surface information from the obtained slice sequence.
We present a holographic topometry system for medical application to measure living human faces. The short recording time avoids resolution limitations caused by unvoluntary movements of the patients. The holographic camera system provides a spatially modulated object beam to project high-contrast patterns onto the skin. Furthermore we present a real image reconstruction setup which reduces the occurence of unwanted speckles.