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Design of visible light,medium/long-infrared tri-band shared-aperture and con-focal optical system
Pages: 301-306
Year: Issue:  3
Journal: Laser & Infrared

Keyword:  tri-bandshared aperturecon -focalathermalization;
Abstract: In order to meet the high resolution、high accuracy of environmental detection,to improve the detection ca-pability in complex environment and to solve the problems that the conversion speed of the optical path was slow for multi-band optical system and there were differences in the object information of different bands,an optical system that features visible light,medium /long-infrared light,shared aperture,con-focal was designed.The system can receive target informations of three bands at the same time.The focal length for visible、medium /long-infrared light is equal by focal length compensation,which improves the consistency of target information for three bands.The focal length is 1 2 mm and field of view is 36°.The transfer function value is >0.53 for visible light at 80 lp /mm Nyquist frequency;the transfer function value is >0.5 for mid-infrared light at 20 lp /mm and the transfer function value is >0.36 for long-infrared light at 20 lp /mm.The system has an excellent overall image quality and is athermal for temperatures between -40 °C and +60 °C.
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