首页|Design of a Modified Cassegrain System Used in Joint Transform Correlator
Design of a Modified Cassegrain System Used in Joint Transform Correlator
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In order to detect and recognize infrared target with joint transform eorrelator, a modified Cassegrain optical system is designed. The main advantages of the system are large field-of-view, infrared dual-hand common optical path and compact structure. In the modified Cassegrain optical system, the working wavelengths are. 3.7～4.8 μm and 8～12 μm, the field-of-view is 4° and the aperture is 240 mm. The paraholoidal primary mirror and hyperboloidal secondary mirror are all replaced by spherical surfaces. So the problems of high machining accuracy and alignment become much easier. In order to balance the aberrations, three compensating lenses are used in the system. The total length of the system is 183 mm, and the ratio of the total length to focal length is 0.68. Moreover, the system has a good performance of athermalization between negative 40 ℃ and positive 60 ℃. The design results of the system show that the MTF value of each field is greater than 0.72 when the cut-off frequency is 11 1p/mm. Due to the excellent image quality of the modified optical system, the ability of Joint transform correlator (JTC) applied in target tracking and identification has been improved for further.
optical designjoint transform correlatorinfrared dual-bandaspherical surfaceCassegrain optical system
MA Yongli、WANG Wensheng
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Laboratory of Contemporary Optical Measure Technology, Changchun University of Science and Technology, Changchun 130022, CHN
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