Translator Disclaimer
19 November 2019 Design method for high magnification mid-wave infrared continuous zoom lens
Author Affiliations +
This paper reports a design process for high magnification mid-wave infrared continuous zoom lens. The process consists of algorithms for finding global paraxial solution, optimization strategies for balancing aberrations in all zoom configurations, and cam curve smoothing methods in opto-mechanical design. Using this process, a parfocal continuous zoom lens with F/4, magnification of 20× working with a 640x512 cooled 15μm pixel pitch detector array, has been successfully designed and fabricated. In principal, this design bases on a zoom and a focus group. The zoom group consisting of three separate moving lens subsets allows for a high magnification ratio of 20× and its parfocality during continuous zooming, while the focus group helps changing focal planes and ensures normal operation in a large temperature and observation range. The lens uses different optical surfaces varying from spherical to hybrid diffractiveaspheric form. This results in high optical performance with MTF approaching diffraction limit while keeping the overall system compact and light weight. For the coordination of lens movement in the zoom group, smooth cam curves having satisfactory stiffness and pressure angles were achieved by a smoothing method which maps different system focal length values with appropriate barrel rotation angles. The simulation of optical performance and experimental testing results will be presented. This zoom lens can be used in long range surveillance camera system.
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xuan Du Dang, Thanh Dat Vu, Minh Anh Hoang, and Dai Cuong Que "Design method for high magnification mid-wave infrared continuous zoom lens", Proc. SPIE 11185, Optical Design and Testing IX, 111850N (19 November 2019);


Optical design study and prototyping of a dual field zoom...
Proceedings of SPIE (September 03 2015)
Increasing dual band infrared zoom ranges
Proceedings of SPIE (September 09 2015)
Mid-wavelength infrared continuous zoom lens design
Proceedings of SPIE (May 03 2017)
Design study of a MWIR/LWIR mulitple FOV lens
Proceedings of SPIE (May 08 2018)
Design of imaging lens of large field of view of...
Proceedings of SPIE (January 10 2018)
Optical concepts for dual band infrared continuous zoom lenses
Proceedings of SPIE (September 09 2010)

Back to Top