Design Of IR Panoramic Optical System

With the continuous development of infrared technology and panoramic imaging technology, infrared panoramic optical system replace the single field vision system and become hot in every country. Compared with the single field vision system, infrared panoramic system has unparalleled advantages:it overcomes the disadvantage of inefficient, poor real-time in continuous new target capturing, slow update and so on. It improves target perception and rate of track search to ensure the accuracy of target detection. And it has high detection sensitivity and can recognize the various disguises and multi-level, multi-angle goal threat at night or under adverse environmental conditions.After infrared panoramic imaging methods and development trends have been summarizd at home and abroad in this paper, the method of a multi-camera panoramic imaging has been chosen, then large field of view and large relative aperture objective lens of IR is designed. By using interactive field deployment a five-channel middle infrared panoramic optical system is designed that direction of 360°and the top position of 90°field of view. A detector replace several detectors to receive the image information with azimuth and top. After analysis of various of aberration curve, spot diagram and MTF, the result shows that the system has good image quality in the entire field of view, and MTF is near the diffraction-limitation at 171p/mm. Through analyzing several existing infrared temperature compensation methods, the infrared system is achieved in large working temperature range -40℃～60℃by optical passive athermalisation technique matching different materials and reasonable distributing optical power. The design result shows that image quality meets the requirement of design and system has stability of the image surface in given temperature range.System tolerance is allocated, and errors are analyzed through defocus method. Using sensitivity analysis in ZEMAX, the relatively low processing requirement is given to meet the system tolerance which provides the basis for processing and alignment in the infrared panoramic system. To realize the engineering, simple compensation devices of image motion is designed based on image motion of the system.In connection with imaging mode of infrared panoramic system, the key technology of panorama stitching—image registration is studied. The feature corner is selected after various of image registrations, Harris corner algorithm is determined based on Moravec operator, characteristics of different targets are simulated by MATLAB experiments, the result shows that the Harris algorithm have high accuracy and high value.