Automatic algorithm for triaxial hodogram source location in downhole acoustic emission measurement
- 1 April 1989
- journal article
- Published by Society of Exploration Geophysicists in Geophysics
- Vol. 54 (4) , 508-513
- https://doi.org/10.1190/1.1442677
Abstract
An automatic acoustic emission (AE) source location algorithm has been developed for downhole AE measurement of subsurface cracks by using the triaxial hodogram method. The P-wave arrival time is detected by analyzing crosscorrelation coefficients among three components of AE signal energy; the P-wave direction is determined by the method of least squares. For detection of S-wave arrival time, a maximum‐likelihood method analyzes a distribution of instantaneous values of the SH-wave component amplitude. This algorithm can locate an AE source as accurately as human analysis. For field measurements, it takes less than 4 s to locate an AE source using a 16-bit personal computer with a program in C language. Automatic AE source location by the triaxial hodogram method has been realized with this algorithm.Keywords
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