Optimization of Transducer Array Geometry for Acoustic Emission/Microseismic Source Location

Abstract

Transducer array geometry may be one of the most important factors affecting acoustic emission/microseismic (AE/MS) source location accuracy. This thesis presents a fundamental consideration of the role of transducer array geometry in AE/MS source location. The thesis first addresses the mechanism of array geometry in the control of source location accuracy which provides an insight into why the array geometry has a significant affect on source location accuracy. Following this, two basic effects, geometrical spreading and direction control, are investigated. This provides a global view on how the array geometry affects source location accuracy. Based upon the fundamental concepts developed, the typical effects of 2-dimensional arrays are first compared and analyzed. But the most important result is that a method has been found to objectively control source location. This should mark the beginning of the design of 3-dimensional AE/MS transducer arrays. A number of other basic problems are also considered in this thesis. These include the discussion of the relationship of the optimization of transducer array geometry and the least-squares-technique, the comparison of the effects of the velocity error and the arrival time error, the development and verification of a simulation procedure, and the proof of the condition necessary to determine a unique source location. Source location data from two recent AE/MS field studies are incorporated into this research.

Department(s)

Mining Engineering

Comments

Thesis/Dissertation

Keywords and Phrases

Applied Sciences; Earth Sciences; Geophysics; Mining

Document Type

Book

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1988 Pennsylvania State University, All rights reserved.

Publication Date

01 Jan 1988

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