Rotation axis estimation for the derotator calibration with machine vision measurement of the auxiliary laser

Yongkai Yin; Bettina Altmann; Christian Pape; Eduard Reithmeier

doi:10.1117/12.2500549

2 November 2018 Rotation axis estimation for the derotator calibration with machine vision measurement of the auxiliary laser

Yongkai Yin, Bettina Altmann, Christian Pape, Eduard Reithmeier

Author Affiliations +

Proceedings Volume 10819, Optical Metrology and Inspection for Industrial Applications V; 108190S (2018) https://doi.org/10.1117/12.2500549
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

A key problem when using the derotator is to ensure the coaxial alignment between the optical axis of the derotator and the rotation axis of the measured object. Moreover, accurate measurement of the rotation axis is the prerequisite of achieving the coaxial alignment. In this paper, we propose a strategy for estimation of the rotation axis with the assistant of an auxiliary laser and a binocular stereo vision sensor. When a laser source is temporarily attached to the measured object or the rotor shaft, the rotation of the laser will generate a ruled surface. The binocular sensor can accurately measure the coordinates of laser dots in three-dimensional (3D) space. The pose vector of the laser in each certain rotation angle can be estimated with measured 3D coordinates of the laser dots. Finally, the rotation axis of the object can be estimated with multiple pose vectors considering the constraint of the fixed axis rotation. The validity and precision of this proposed strategy are demonstrated by means of experiments.

Citation Download Citation

Yongkai Yin, Bettina Altmann, Christian Pape, and Eduard Reithmeier "Rotation axis estimation for the derotator calibration with machine vision measurement of the auxiliary laser", Proc. SPIE 10819, Optical Metrology and Inspection for Industrial Applications V, 108190S (2 November 2018); https://doi.org/10.1117/12.2500549

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