Method for imaging with low frequency electromagnetic fields
- Lafayette, CA
- Berkeley, CA
A method for imaging with low frequency electromagnetic fields, and for interpreting the electromagnetic data using ray tomography, in order to determine the earth conductivity with high accuracy and resolution. The imaging method includes the steps of placing one or more transmitters, at various positions in a plurality of transmitter holes, and placing a plurality of receivers in a plurality of receiver holes. The transmitters generate electromagnetic signals which diffuse through a medium, such as earth, toward the receivers. The measured diffusion field data H is then transformed into wavefield data U. The traveltimes corresponding to the wavefield data U, are then obtained, by charting the wavefield data U, using a different regularization parameter .alpha. for each transform. The desired property of the medium, such as conductivity, is then derived from the velocity, which in turn is constructed from the wavefield data U using ray tomography.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- DOE Contract Number:
- AC03-76SF00098
- Assignee:
- Regents, University of California (Oakland, CA)
- Patent Number(s):
- US 5373443
- OSTI ID:
- 869650
- Country of Publication:
- United States
- Language:
- English
A new approach to imaging with low‐frequency electromagnetic fields
|
journal | June 1993 |
A new approach to modeling the electromagnetic response of conductive media
|
journal | September 1989 |
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