Target depth estimation for a metal detector in the frequency domain

1998 ◽  
Author(s):  
J. Trevelyan
Keyword(s):  
Frequency Domain ◽  
Depth Estimation ◽  
Metal Detector ◽  
Target Depth

Moisture Effects in Soils Using a Frequency Domain Metal Detector

2006 ◽  
Author(s):  
B. Rosendo Vales ◽  
S. Harneit ◽  
M. Reuter ◽  
V. Skorupskaite
Keyword(s):  
Frequency Domain ◽  
Metal Detector ◽  
Moisture Effects

Depth estimates from ratios of gravity, geoid, and gravity gradient anomalies

Geophysics ◽  
1986 ◽  
Vol 51 (1) ◽  
pp. 123-136 ◽  
Author(s):  
Carl Bowin ◽  
Edward Scheer ◽  
Woollcott Smith
Keyword(s):  
Frequency Domain ◽  
Spectral Methods ◽  
Depth Estimation ◽  
Data Type ◽  
Gravity Gradient ◽  
Data Types ◽  
Vertical Gravity Gradient ◽  
Frequency Domain Methods ◽  
Gradient Measurements ◽  
Vertical Gravity

The utility of combining geoid, gravity, and vertical gravity gradient measurements for delineation of causative mass anomalies is explained and compared with spatial and spectral methods for depth estimation. Depth rules for various source geometries are reviewed and new rules developed for geoid, gravity, and vertical gravity‐gradient data. Both spatial and frequency‐domain methods are discussed. Simple ratios of single observations of different data types (e.g., geoid, gravity, or vertical gravity gradient) are shown to provide information comparable to the traditional spatial and frequency analyses of one data type alone.

scholarly journals Target-depth estimation in active sonar

2016 ◽  
Vol 139 (4) ◽  
pp. 2052-2052
Author(s):  
Alexis F. Mours ◽  
Nicolas Josso ◽  
Jérôme I. Mars ◽  
Cornel Ioana ◽  
Yves Doisy
Keyword(s):  
Depth Estimation ◽  
Active Sonar ◽  
Target Depth

Target depth estimation by frequency interference matching for a deep vertical array

2022 ◽  
Vol 186 ◽  
pp. 108493
Author(s):  
Lisheng Zhou ◽  
Guangying Zheng ◽  
T.C. Yang
Keyword(s):  
Depth Estimation ◽  
Vertical Array ◽  
Target Depth

Examination of the relative influence of current gathering on fixed loop and moving source electromagnetic surveys

Geophysics ◽  
2001 ◽  
Vol 66 (4) ◽  
pp. 1059-1066 ◽  
Author(s):  
K. Duckworth ◽  
T. D. Nichols ◽  
E. S. Krebes
Keyword(s):  
Frequency Domain ◽  
Physical Model ◽  
Abrupt Onset ◽  
Loop System ◽  
Model Parameters ◽  
Host Environment ◽  
Moving Source ◽  
Model Study ◽  
Order Of Magnitude ◽  
Target Depth

A physical model study was conducted of the responses provided by moving‐source and fixed‐loop frequency‐domain electromagnetic prospecting systems when operated over the same target conductor located in a conductive host environment. The results indicate that the fixed‐loop responses display enhancement due to the current gathering effect that exceeds that seen in the moving‐source responses by at least an order of magnitude for all the source‐to‐receiver separations tested for the moving‐source system. The results also indicate that as transmitter frequency is increased the current gathering effect displays an abrupt onset in the responses provided by both systems, but that this onset begins at a frequency which is a decade lower for the fixed‐loop system than the corresponding frequency of onset for the moving‐source system. The current gathering enhancement effects show a clear reduction with increase of target depth for the fixed‐loop system but an increase with depth for the moving‐source system. The model parameters employed in these studies are shown to be well related to typical conditions found in full‐scale surveys.

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