Optical testing of the surface quality of a variable focal length lens with null-screens

Manuel Campos-García; Agustín Santiago-Alvarado; Víctor Iván Moreno-Oliva; Rufino Díaz-Uribe

doi:10.1117/12.903392

25 October 2011 Optical testing of the surface quality of a variable focal length lens with null-screens

Manuel Campos-García, Agustín Santiago-Alvarado, Víctor Iván Moreno-Oliva, Rufino Díaz-Uribe

Proceedings Volume 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World; 801123 (2011) https://doi.org/10.1117/12.903392
Event: International Commission for Optics (ICO 22), 2011, Puebla, Mexico

Abstract

The null-screen method has been used to test aspheric surfaces. This geometrical method measures the slope of the test surface and by a numerical integration procedure the shape of the test surface can be obtained. Now, in order to test the surfaces of a variable focal length lens (VFLL), we propose use a conical null-screen. We present the formulae to design the null-screen in such a way that the image on the CCD is a perfect array of spots; departures from this geometry are observed as deformation of the surface. The VFLL is designed in such a way that under conditions of mechanical equilibrium both surfaces are spherical; however, its shape can be easily modified mechanically changing its radius of curvature. In order to analyze the shape of the surfaces of the VFLL at different radius of curvature, we evaluate its form using a conical null-screen. This procedure allows study the deformations of the surface.

Citation Download Citation

Manuel Campos-García, Agustín Santiago-Alvarado, Víctor Iván Moreno-Oliva, and Rufino Díaz-Uribe "Optical testing of the surface quality of a variable focal length lens with null-screens", Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 801123 (25 October 2011); https://doi.org/10.1117/12.903392

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