1887
Volume 45, Issue 3
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

[

Limitations to conductive target detection in AEM systems come from the high noise encountered at low base frequencies, caused by rotations of vector magnetic field sensors in the Earth’s magnetic field. We use rotation-rate sensors to predict and subtract the rotation noise from rigidly coupled ARMIT magnetic field sensors.

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We aim to eliminate or reduce significant impediments to conductive target detection and conductive cover penetration in airborne electromagnetic (AEM) systems. Existing limitations come from the very high noise encountered at low base frequencies, caused by rotations of vector magnetic field sensors in the Earth’s magnetic field. We use the output of tri-axial rotation-rate sensors to predict and subtract the rotation noise from rigidly coupled ARMIT magnetic field sensors. The approach is successful in reducing rotation noise by one to two orders of magnitude at low frequencies.

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/content/journals/10.1071/EG13064
2014-09-01
2026-01-14
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References

  1. Barringer, A. R., 1963, Mounting system for the isolation of rotational vibrations: US Patent 3115326.
  2. Buselli G. Hwang H. S. Pik J. P. 1998 AEM noise reduction with remote referencing: Exploration Geophysics 29 71 76 10.1071/EG998071
    https://doi.org/10.1071/EG998071 [Google Scholar]
  3. Davis A. Macnae J. Robb T. 2006 Pendulum motion in airborne HEM systems: Exploration Geophysics 37 355 362 10.1071/EG06355
    https://doi.org/10.1071/EG06355 [Google Scholar]
  4. King, A., 2007, Review of geophysical technology for Ni-Cu-PGE deposits, in B. Milkereit, ed., Proceedings of Exploration 07: fifth decennial international conference on mineral exploration: 647–665.
  5. Kratzer T. Macnae J. C. 2012 Induced polarization in airborne EM: Geophysics 77 E317 E327 10.1190/geo2011‑0492.1
    https://doi.org/10.1190/geo2011-0492.1 [Google Scholar]
  6. Kratzer T. Vrbancich J. 2007 Real-time kinematic tracking of towed AEM birds: Exploration Geophysics 38 132 143 10.1071/EG07012
    https://doi.org/10.1071/EG07012 [Google Scholar]
  7. Kratzer T. Macnae J. Mutton P. 2013 Detection and correction of SPM effects in airborne EM surveys: Exploration Geophysics 44 6 15 10.1071/EG12048
    https://doi.org/10.1071/EG12048 [Google Scholar]
  8. Kuzmin, P., and Morrison, E., 2009, Double-suspension receiver coil system and apparatus: US Patent 8030933.
  9. Lee J. Turner R. Downey M. Maddever A. Dart D. Foley C. Binks R. Lewis C. Murray W. Panjkovic G. 2001 Experience with SQUID magnetometers in airborne TEM surveying: Exploration Geophysics 32 9 13 10.1071/EG01009
    https://doi.org/10.1071/EG01009 [Google Scholar]
  10. Macnae, J., 2007, Developments in broadband airborne electromagnetics in the past decade, in B. Milkereit, ed., Proceedings of Exploration 07: fifth decennial international conference on mineral exploration: 387–398.
  11. Macnae J. 2012 Design and testing of ARMIT magnetic field sensors for EM systems: ASEG Extended Abstracts 2012 1 4 10.1071/ASEG2012ab343
    https://doi.org/10.1071/ASEG2012ab343 [Google Scholar]
  12. Macnae J. Kratzer T. 2013 Joint sensing of B and dB/dt responses: ASEG Extended Abstracts 2013 1 4
    [Google Scholar]
  13. Macnae J. C. Lamontagne Y. West G. F. 1984 Noise processing techniques for time-domain EM systems: Geophysics 49 934 948 10.1190/1.1441739
    https://doi.org/10.1190/1.1441739 [Google Scholar]
  14. McCracken K. Oristaglio M. Hohmann G. 1986 Minimization of noise in electromagnetic exploration systems: Geophysics 51 819 832 10.1190/1.1442134
    https://doi.org/10.1190/1.1442134 [Google Scholar]
  15. Morrison, E., Kuzmin, P., and Tishin, P., 2007, Airborne electromagnetic time domain system, computer product and method: US Patent 7157914 B2.
  16. Munkholm M. S. 1997 Motion-induced noise from vibration of a moving TEM detector coil: characterization and suppression: Journal of Applied Geophysics 37 21 29 10.1016/S0926‑9851(97)00004‑9
    https://doi.org/10.1016/S0926-9851(97)00004-9 [Google Scholar]
  17. Smiarowski A. Macnae J. Bailey R. 2010 Predictive filter calculation of primary fields in a fixed-wing time-domain AEM system: Geophysics 75 F97 F106 10.1190/1.3431738
    https://doi.org/10.1190/1.3431738 [Google Scholar]
  18. Turner, R., Maddever, R., and van den Heuvel, R., 2002, Apparatus for reducing rotation of a towed airborne article: US Patent 6369573 B1.
  19. Vrbancich J. Fullagar P. Macnae J. 2000 Bathymetry and seafloor mapping via one dimensional inversion and conductivity depth imaging of AEM: Exploration Geophysics 31 603 610 10.1071/EG00603
    https://doi.org/10.1071/EG00603 [Google Scholar]
  20. Vrbancich J. Macnae J. Sattel D. Wolfgram P. 2005 A case study of AEM bathymetry in Geographe Bay and over Cape Naturaliste, Western Australia, Part 2: 25 and 12.5 Hz GEOTEM: Exploration Geophysics 36 381 392 10.1071/EG05381
    https://doi.org/10.1071/EG05381 [Google Scholar]
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  • Article Type: Research Article
Keyword(s): airborne EM, low-frequency, motion noise, rotation noise.

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