Infrared telephoto lens design of hybrid optoelectronic joint transform correlator - art. no. 68343F

Hybrid optoelectronic joint transform correlator is very useful for target detection and recognition in military and industry field. Nowadays, there are two kinds of usual detectors: one is visible detector which is sensitive to the diffusion of target; the other is infrared detector which is sensitive to the radiation of target. The performance of these two detectors both depend on their working conditions. Designing perfect optical system is the first step to target detection. While the merit of infrared optical system is it can not only detect great distance but also detect the target in the turbid air or smoke, flog and snow no matter at day or night. So it is much more appropriate to be applied in cluttered and formidable conditions and it can enhance target recognition ratio. In this paper, the infrared detector we adopted is infrared focal plane arrays with working waveband 8-12 mu m. Its resolving power is 30 lp/mm. For the infrared optical system, the effective focal length, relative aperture and the field of view should be large enough to ensure the long distance and large field of view target can be detected. In hybrid optoelectronic joint transform correlator, the high performance of infrared telephoto lenses is required. Here, we designed infrared telephoto lenses composed of three lenses. Its structure is simple but its performance is very good. It has met the requirement of target detection. Thus we can get the longer detection distance and higher recognition accuracy.