Optical quality evaluation for active afocal systems

Xoana Barcala; Enrique Gambra; Lucie Sawides; Ivan Martinez-Ibarburu; Victor Rodriguez-Lopez; Carlos Dorronsoro

doi:10.1117/12.2596921

12 September 2021 Optical quality evaluation for active afocal systems

Xoana Barcala, Enrique Gambra, Lucie Sawides, Ivan Martinez-Ibarburu, Victor Rodriguez-Lopez, Carlos Dorronsoro

Proceedings Volume 11871, Optical Design and Engineering VIII; 118710Q (2021) https://doi.org/10.1117/12.2596921
Event: SPIE Optical Systems Design, 2021, Online Only

Abstract

SimVis Gekko is a novel see-through binocular visual simulator that is based on liquid-membrane tunable lenses (TLs) projected onto the pupil of the eye using a twisted miniaturized 4-f system. Following a temporal multiplexing approach that introduces periodic defocus variations in optical power at 50Hz, the TL generates multifocal images on the retina of the observer, that look static. In this study, the image quality of different tentative designs of SimVis Gekko was evaluated for different optical powers. The full optical system of SimVis Gekko was computer simulated to get the spot size, prismatic shift, angular magnification, and field curvature up to 20° of field of view. An image quality bench was developed to capture and process images through the SimVis Gekko simulator. The system comprises a grayscale camera and a 19- mm focal-length lens with an adjustable diaphragm. A high-resolution screen was placed at one meter with two different targets: (1) a checkerboard, imaged through a 1-mm diaphragm, to measure optical quality, prismatic shift, magnification, and optical distortion; (2) a binary noise, imaged through a 5-mm diaphragm, used to measure the local field curvature and image quality. Images were obtained from 1 to 3D of the TL and automatically analyzed. Theoretical simulations and experimental measurements showed good agreement. Magnification and curvature were the major differences across designs. The last version measured was free of optical distortions with a central curvature-free area with high optical quality. The developed system could guide the assembly and fine adjustment of active afocal optical systems.

Conference Presentation

Citation Download Citation

Xoana Barcala, Enrique Gambra, Lucie Sawides, Ivan Martinez-Ibarburu, Victor Rodriguez-Lopez, and Carlos Dorronsoro "Optical quality evaluation for active afocal systems", Proc. SPIE 11871, Optical Design and Engineering VIII, 118710Q (12 September 2021); https://doi.org/10.1117/12.2596921

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

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.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available