Design and performance of an optical measurement system for position measurement and control in a large gap magnetic suspension system

Sharon S. Welch

doi:10.1117/12.189125

6 October 1994 Design and performance of an optical measurement system for position measurement and control in a large gap magnetic suspension system

Sharon S. Welch

Author Affiliations +

Proceedings Volume 2350, Videometrics III; (1994) https://doi.org/10.1117/12.189125
Event: Photonics for Industrial Applications, 1994, Boston, MA, United States

Abstract

This paper presents the design and performance of an optical measurement system (OMS) which is used to measure the position of a magnetically suspended element as part of the feedback control system for the NASA Langley Large Gap Magnetic Suspension System (LGMSS). A new processing architecture which is to be implemented in the OMS to increase the rate at which position information is made available to the LGMSS controller is also discussed. The OMS consists of multiple linear charge-coupled device cameras which detect small infrared light emitting diode targets embedded in the surface of a magnetically suspended cylinder. The OMS estimates the position and attitude of the cylinder in six- degrees-of-freedom and supplies this information to the LGMSS control computer at a rate of 40 samples per second. Experiments have been run to evaluate the performance of the OMS. The accuracy of the OMS was evaluated using a static test model of the cylinder. Test results show that the one sigma (one standard deviation) in the OMS estimates of cylinder position and attitude are approximately +/- 0.001 inch in x and y, +/- 0.0005 inch in z, +/- 0.005 degree in pitch and yaw, and +/- 0.01 degree in roll.

Citation Download Citation

Sharon S. Welch "Design and performance of an optical measurement system for position measurement and control in a large gap magnetic suspension system", Proc. SPIE 2350, Videometrics III, (6 October 1994); https://doi.org/10.1117/12.189125

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