A simple optical system for measuring small rotation angle of mechanism

Weijun Li; Qinwei Ma; Dongwei Li; Siyang Liu; Chen Yuan

doi:10.1117/12.871325

11 November 2010 A simple optical system for measuring small rotation angle of mechanism

Weijun Li, Qinwei Ma, Dongwei Li, Siyang Liu, Chen Yuan

Proceedings Volume 7855, Optical Metrology and Inspection for Industrial Applications; 78550G (2010) https://doi.org/10.1117/12.871325
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

A simple optical system for small rotation angle measurement is constructed in this paper. A laser diode is fixed on the rotation part of the mechanism and the laser beam is received by a screen. The position of the spot could be registered from the image captured by CCD camera using the gray centroid algorithm. Then rotation could be obtained from the spot movement according to geometrical relationship. In order to verify the system and evaluate its accuracy, a deflection test of a low carbon steel cantilever beam is performed. It shows that the maximum relative error of experiment results and theoretical value is less than 1.5%, the measuring accuracy and stability is satisfied. The system in this paper has many advantages, such as high resolution, low cost, great convenience and could be used to measure small rotation angles of very complex mechanisms under non-contact request.

Citation Download Citation

Weijun Li, Qinwei Ma, Dongwei Li, Siyang Liu, and Chen Yuan "A simple optical system for measuring small rotation angle of mechanism", Proc. SPIE 7855, Optical Metrology and Inspection for Industrial Applications, 78550G (11 November 2010); https://doi.org/10.1117/12.871325

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