Abstract

Light-in-Flight recording by holography is a technique for direct visualization of the propagation of a short light pulse when it is e.g. intersecting a 3D-shaped object. This is achieved by letting the reference beam be delayed in comparison to the object beam along the holographic plate. As a result, different intersections are seen from different points of the hologram and can be put together using an image processing system in order to measure the 3D-shape [1]. The delay is usually achieved by letting the reference beam be incident on the hologram at a grazing angle. This requires a high resolution recording media such as a photographic emulsion. In order to make the result directly achievable to the image processing system, it would be preferable to record the hologram directly in a CCD-array. However, the limited resolution of the CCD-array requires that the reference- and object beams are almost parallel and perpendicular incident on the array.

© 1998 IEEE