A measurement method of curvature radius and shell thickness of laser fusion capsule by combining computer vision and virtual laser differential confocal technology

Xianxian Ma; Lirong Qiu; Yun Wang

doi:10.1117/12.2615583

14 November 2021 A measurement method of curvature radius and shell thickness of laser fusion capsule by combining computer vision and virtual laser differential confocal technology

Xianxian Ma, Lirong Qiu, Yun Wang

Author Affiliations +

Proceedings Volume 11914, SPIE Future Sensing Technologies 2021; 119140V (2021) https://doi.org/10.1117/12.2615583
Event: SPIE Future Sensing Technologies, 2021, Online Only

Abstract

We propose a measurement method of curvature radius and shell thickness of laser fusion capsule by combining computer vision and virtual laser differential confocal technology. We use a CCD to photograph the surface of the capsule, to obtain the subpixel coordinates of the contour edge of the capsule. The qualified capsule can be quickly selected by using the least square fitting algorithm to fit the outer curvature radius. We then use the virtual laser differential confocal detection device to measure the position of the vertex on the outer surface of the capsule, the vertex on the inner surface of the capsule and the center of the capsule. Based on the characteristic that the zero-crossing of the laser differential confocal curve accurately corresponds to the focus of the objective lens, the outer and inner curvature radius and shell thickness of the capsule are measured precisely. The experimental results show that the repeatability of measurement of the outer curvature radius, inner curvature radius and shell thickness are 23 nm, 41 nm and 41 nm, respectively. Compared with the existing measurement methods, the capsule whose curvature radius and shell thickness are qualified can be accurately and quickly selected from the batch capsule using the method, which provides a technical support to the quality characterization of the laser fusion capsule.

Conference Presentation

Citation Download Citation

Xianxian Ma, Lirong Qiu, and Yun Wang "A measurement method of curvature radius and shell thickness of laser fusion capsule by combining computer vision and virtual laser differential confocal technology", Proc. SPIE 11914, SPIE Future Sensing Technologies 2021, 119140V (14 November 2021); https://doi.org/10.1117/12.2615583

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