Laser marking system for photogrammetric analysis - directs laser beam into composite prism for reflection at mating surfaces inclined at forty-five degree angle and for combination with observation beam, and directs through common annular metal aperture

摘要

A composite prism (2) located in the observation beam path has a surface (3) inclined at 45 deg. onto which a laser beam is focussed so that the laser and observation beams are combined at a common point in the image plane (7). The exit point of both beams from the prism lies on the image plane. The dia. of a metal annular aperture (6) located at the exit point forms the measurement marker for the laser and observation beam path. The laser can be coupled to the beam divider directly or via a light-guide. USE/ADVANTAGE - For marking photogrammetric measurement images using simple, low cost auxiliary device for interpretation and evaluation.