PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.
Many fixed focus lenses for uncooled state of the art LWIR cameras are frequently factory set at large distance and therefore produce blurred thermal imagery when targets are closer than 80 m. To solve this issue, we propose a freeform based varifocal attachment that consists of two thin Germanium plates and is derived from Alvarez-Lohmann concept. When implemented together with our low-cost f/1.1 65 mm LWIR lens, the varifocal attachment enables sharp thermal imagery from 2 m to infinity. Extensive tolerancing study supports feasibility of this freeform device for future manufacturing.
Viktor P. Syvokin andStan Szapiel
"Freeform based focusing attachment for fixed focus thermal LWIR objectives (Conference Presentation)", Proc. SPIE 11403, Advanced Optics for Imaging Applications: UV through LWIR V, 1140304 (27 April 2020); https://doi.org/10.1117/12.2561592
ACCESS THE FULL ARTICLE
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.
The alert did not successfully save. Please try again later.
Viktor P. Syvokin, Stan Szapiel, "Freeform based focusing attachment for fixed focus thermal LWIR objectives (Conference Presentation)," Proc. SPIE 11403, Advanced Optics for Imaging Applications: UV through LWIR V, 1140304 (27 April 2020); https://doi.org/10.1117/12.2561592