An optical apparatus for machine vision inspecting both top and bottom surfaces of the TEC components

Longlong Su; Pinghui Wu Sr.; Zhiwei Guo; Shifa Pan Sr.; Tingdi Liao

doi:10.1117/12.2548048

18 December 2019 An optical apparatus for machine vision inspecting both top and bottom surfaces of the TEC components

Longlong Su, Pinghui Wu Sr., Zhiwei Guo, Shifa Pan Sr., Tingdi Liao

Proceedings Volume 11338, AOPC 2019: Optical Sensing and Imaging Technology; 113383C (2019) https://doi.org/10.1117/12.2548048
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China

Abstract

In this paper, a novel optical inspection apparatus was studied which enables one to inspect both top and bottom surfaces of the thermoelectric cooler (TEC) components. In the optical inspection apparatus, a right angle prism reflector located beneath the glass stage was used to image the bottom surface of the TEC component on top of the stage. In order to obtain the clear images of two surfaces of the TEC component simultaneously, a proper telecentric imaging lens with sufficient large depth of field needs to be selected to address their optical path difference. A telecentric optical imaging lens DH110-03F50 with depth of field of around 6mm together with a right angle prism reflector with solpe side length of 3.6mm was chosen for this experimental setup. With this apparatus three groups of components were inspected in the experiments and each group has some typical samples with specially selected Passed and Failed features on the surfaces to be examined. The experimental results indicate that the images of both top and bottom surfaces obtained using the optical inspection system are sufficiently clear and well resolved which meets the requirements for the following image processing. The results show that the proposed technique allow us to inspect both top and bottom surfaces of the component with simplified configuration and effective cost. This novel inspecting technique will find applications in the automatic optical inspection systems for the TEC components.

Citation Download Citation

Longlong Su, Pinghui Wu Sr., Zhiwei Guo, Shifa Pan Sr., and Tingdi Liao "An optical apparatus for machine vision inspecting both top and bottom surfaces of the TEC components", Proc. SPIE 11338, AOPC 2019: Optical Sensing and Imaging Technology, 113383C (18 December 2019); https://doi.org/10.1117/12.2548048

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