Method and device for optical target tracking of target object that can be irradiated with a high-energy laser

摘要

The invention relates to a method and a device (1) for optical target tracking of a target object (5) which can be irradiated with a high energy laser (2), wherein the target object (5) is illuminated by an illumination laser (6). In order to enable a precise alignment of the laser beam (4) of the high-energy laser (2) on the target object (5) even if on the target object (5) triggered by the laser beam (4) flame and / or smoke development or self-lighting ( Disturbance), the invention proposes a differential image determination. For this purpose, synchronously and with the same exposure time two camera images (22, 24) of the target object (5) are recorded and stored in different wavelength ranges, each with a separate camera (14, 15), wherein the first wavelength range is selected such that the radiation of the illumination laser (6) is measurable. The second wavelength range is slightly shifted with respect to the first wavelength range, such that although not the radiation of the illumination laser (6) itself but the interference (23) caused by the irradiation with the high energy laser (2) is measured. If the second camera image (24) is now electronically subtracted from the first camera image (22), a difference image (25) with a target object freed from the interference (23) is produced.