Optical projection and image processing approach for mine wall monitoring

Blake Gray; Randy H. Moss; Derek Apel; Steve E. Watkins

doi:10.1117/1.2424914

1 January 2007 Optical projection and image processing approach for mine wall monitoring

Blake Gray, Randy H. Moss, Derek Apel, Steve E. Watkins

Author Affiliations +

Optical Engineering, Vol. 46, Issue 1, 013601 (January 2007). https://doi.org/10.1117/1.2424914

Abstract

Wall movement in an underground mine must be continually monitored to provide real-time assessment of dynamic stress changes around mining excavation and to warn against rock failure. An in situ approach using optical spot projection and image processing can measure submillimeter movements. The system can be easily automated and poses no obstruction to mine traffic. The position of an off-normal laser spot will shift as the target wall moves. The centroid of this projected spot can be measured through image processing of a digital image. Multiple laser spots give the system simultaneous information over a larger sampled area. Software processing can measure subpixel shifts of the spot centroid. The resolution depends on the pixel count, the magnification of the camera lens (and hence the field of view), the optical-beam angle, and the spot characteristics. A laboratory table-top experiment demonstrated the system for distances up to 3 m and for a resolution of 0.1 mm. The results were linear in target movement, with standard errors between 0.83% and 5.38%. An automated system is described for a mine environment.

©(2007) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Blake Gray, Randy H. Moss, Derek Apel, and Steve E. Watkins "Optical projection and image processing approach for mine wall monitoring," Optical Engineering 46(1), 013601 (1 January 2007). https://doi.org/10.1117/1.2424914

Published: 1 January 2007

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