Light sectioning with improved depth resolution using a cylindrical lens to magnify the line deformation

Jacques Lewandowski; Lyne Desjardins

doi:10.1117/12.198846

6 January 1994 Light sectioning with improved depth resolution using a cylindrical lens to magnify the line deformation

Jacques Lewandowski, Lyne Desjardins

Proceedings Volume 2348, Imaging and Illumination for Metrology and Inspection; (1994) https://doi.org/10.1117/12.198846
Event: Photonics for Industrial Applications, 1994, Boston, MA, United States

Abstract

Light sectioning computes the object profile using the line deformation seen by a CCD camera. Due to the low magnification between the object and the CCD plane, the image line deformation is small and leads to low resolution on profile measurements. To obtain a larger image deformation, we propose to introduce an additional cylindrical lens that will magnify exclusively the horizontal direction (which contains the profile information) without having any effect on the vertical direction. The limitations of this anamorphic system, such as maximum magnification and maximum object depth, are theoretically examined. The advantages of using a cylindrical lens are mentioned and typical profiles (pyramid, cylinder...) show a gain in depth resolution of approximately 2 to 3 when compared to an earlier light sectioning system. The depth resolution, which was 0.36 mm with the previous system, is now improved to 0.15 mm for an object average distance of 350 mm.

Citation Download Citation

Jacques Lewandowski and Lyne Desjardins "Light sectioning with improved depth resolution using a cylindrical lens to magnify the line deformation", Proc. SPIE 2348, Imaging and Illumination for Metrology and Inspection, (6 January 1994); https://doi.org/10.1117/12.198846

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