Journal Article10.1190/1.1574674
The differential parameter method for multifrequency airborne resistivity mapping
Haoping Huang,Douglas C. Fraser +1 more
TL;DR: In this article, the Sengpiel resistivity sections were used to display helicopter electromagnetic (EM) data in conductive environments, and the SENGPiel resistivities were shown as plan maps and images.
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Abstract: Helicopter EM resistivity mapping began to be accepted as a means of geologic mapping in the late 1970s. The data were first displayed as plan maps and images. Some 10 years later, sectional resistivity displays became available using the same “pseudolayer” half‐space resistivity algorithm developed by Fraser and the new centroid depth algorithm developed by Sengpiel. Known as Sengpiel resistivity sections, these resistivity/depth images proved to be popular for the display of helicopter electromagnetic (EM) data in conductive environments.A limitation of the above resistivity and depth algorithms is that the resulting Sengpiel section may imply that the depth of exploration of the EM system is substantially less than is actually the case. For example, a target at depth may be expressed in the raw data, but its appearance on the Sengpiel section may be too shallow (which is a problem with the depth algorithm), or it may not even appear at all (which is a problem with the resistivity algorithm).An algorith...
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Citations
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TL;DR: In this paper, a helicopter-borne 900 Hz multicoil electromagnetic survey system is used for permafrost delineation and gravel detection using resistivity contour maps from the EM data using any of several half-space models.
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Conductivity-depth imaging of airborne electromagnetic step-response data
TL;DR: In this article, an adaptation of the Macnae-Lamontagne method allows transform of airborne step-response electromagnetic (EM) data to a conductivity-depth image based on a nonlinear transformation of the amplitude of measured response at each delay time to an apparent mirror image depth.
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Approximate inversion of airborne em data from a multilayered ground1
TL;DR: In this paper, a complex transfer function c (or generalized skin depth) can be derived from data for the secondary magnetic field measured by a dipole system with small coil spacing at height h above the ground.
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The multicoil II airborne electromagnetic system
TL;DR: In this paper, a helicopter-towed electromagnetic (EM) system has been developed with two orthogonal transmitter coils, both operating at approximately the same frequency (e.g., 900 Hz).
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