| Popis: |
Very long range surveillance and target recognition applications in the infrared spectral range require optical lens systems with large focal length and high numerical aperture optimized for low aberrations and stray light at a working temperature considerably different from the temperature of mounting and adjustment of the system. Additionally, for the airborne use the system shall be rugged, lightweight and compact. These conflicting requirements do not only represent a demanding design task. The much bigger challenges consist in the selection and characterisation of the optical material, in the fabrication and measurement of the particular optical elements, in their integration into the lens system as well as in the characterisation of this lens system and in the verification of its performance parameters. Recent technological approaches developed at JENOPTIK Laser, Optik, Systeme GmbH for the fabrication and the test of such lens systems will be presented in this paper. It will be shown that an iterative combination of manufacturing and measurement techniques is needed for the fabrication of IR lens systems meeting the highest performance requirements. |
