1887
Volume 14 Number 4
  • E-ISSN: 1365-2478

Abstract

Abstract

The development of optically pumped and monitored “atomic” magnetometers has allowed the application of greater resolution in geomagnetic measurements for exploration purposes. This paper presents a survey of instrumentation in use, the variety of exploration techniques that are being used in practice, and an estimate of their state of development.

Alkali metals (rubidium and cesium) and helium have been used as active elements to obtain the magnetic‐field dependent Larmor frequency. Each of these instruments is capable of obtaining high resolution data (data with sensitivity numerically smaller than one‐tenth gamma). They have been adapted for airborne, land, and marine usage.

Such sensitivity has enabled the rapid development of geomagnetic gradiometers, high sensitivity aeromagnetics, diurnally reduced ground surveys, broad‐band magneto‐telluric surveys, susceptibility measurements, and convenient magnetic search and location techniques. Outlines of each procedure and an example of its application are given.

Resume

En détection des richesses du sol, “les magnétomètres atomiques” qui fonctionnent selon le principe ?un pompage optique ont permis ?obtenir des mesures plus sensibles. Sont décrits les appareillages actuellement utilisés, les méthodes de mesure différentes, ainsi que la situation technique récente.

La génération de la fréquence Larmor qui dépend du champ magnétique s'obtient par les métaux alcalins (le rubidium, le césium) et par ľhélium. Chacun des instruments utilisés fournit des résultats de résolution fine, inférieure au dixième du gamma. Des équipements furent réalisés pour ľutilisation aéroportée, sur navire, ainsi que sur terre.

De telles sensibilités élevées ont été rendues possibles grâce aux nouveaux gradio‐mètres, aux aéro‐magnétomètres extra‐sensibles, aux mesures des profils terrestres avec correction diurne, aux investigations magnéto‐telluriques large bande, aux mesures de susceptibilityé et aux méthodes pratiques de recherche magnétique.

Le sommaire explique les principes à la base et les applications de tous ces proédés.

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2006-04-27
2024-03-29
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References

  1. BREINER, Sheldon (1965): “The Rubidium Magnetometer in Archaeological Exploration”, Science, Vol. 150, No. 3693, p. 185–193. October 8.
    [Google Scholar]
  2. BREINER, Sheldon (1965): “Use of Optically Monitored Magnetometers for Measurement of Magnetic Susceptibility”, Private Memorandum (October).
  3. GIRET Raoul MALNAR, L. (1965): “Un nouveau Magnétomètre Aérien, le Magnétomètere à Vapeur de Caesium”, Geophysical Prospecting, Vol. XIII, No. 2, June.
    [Google Scholar]
  4. GIRET Raoul, I. (1965): “Some Results of Aeromagnetic Surveying with a Digital Cesium‐Vapor Magnetometer”, Geophysics, Vol. XXX, No. 5, October.
    [Google Scholar]
  5. GODBY, E. A. (1965): “Airborne Experiments with Digitized High Sensitivity Magnetometers”, Society of Exploration Geophysicists 35th Annual Meeting, Dallas , November 17, 1965.
    [Google Scholar]
  6. GOLDSTEIN, Norman (1964): “The Separation of Remanent from Induced Magnetism of Near‐Surface Rocks by means of In Situ Measurements”, Space Sciences Laboratory, University of California, Series No. 5, Issue No. 75, Technical Report on ONR Contract Onor 222(89).
    [Google Scholar]
  7. GOLDSTEIN, N. E., WARD, S. H. (1966): “The Separation of Remanent from Induced Magnetism in Situ”, Geophysics, Vol. XXI, No. 4, August.
    [Google Scholar]
  8. HOOD, Peter (1965): “Gradient Measurements in Aeromagnetic Surveying”, Geophysics, Vol. 30, p. 891–902.
    [Google Scholar]
  9. HOOD, Peter (1966): “Trends and Developments in 1965”, Canadian Mining Journal, p. 171–185, February.
    [Google Scholar]
  10. HUGGETT, G. R. (1966): “High Sensitivity Magnetic Field Measurements with Optically Pumped Alkali Vapor Magnetometers”, American Geophysical Union 47th Annual Meeting, Washington , April 21, 1966.
    [Google Scholar]
  11. JENSEN, Homer (1965): “Instrument Details and Applications of a New Airborne Magnetometer”, Geophysics, Vol. XXX, No. 5, October.
    [Google Scholar]
  12. LYNCH Vance, M.; SLACK Howard, A.; LANGAN, Lee (1966): “The Rubidium Vapor Gradiometer and its Application in the Delaware Basin”, Paper delivered at the 13th Annual Meeting of Permian Basin Geophysical Society, May 6.
    [Google Scholar]
  13. RAINEY, Froelich (1966): “New Techniques in Archaeology”, Proc. Am. Philosophical Society, Vol, 110, No. 2, p. 146–152, April 22.
    [Google Scholar]
  14. RALPH, E. K. (1965): “The Search for Sybaris with a Portable Cesium Magnetometer”, University Museum, University of Pennsylvania (in publication).
    [Google Scholar]
  15. RUDDOCK Kenneth, A. and WARD Stanley, H. (1962): “A Field Experiment with a Rubidium‐Vapor Magnetometer”, Journal of Geophysical Research, Vol. 67, No. 5, May.
    [Google Scholar]
  16. SEIMANN, Hartmut (1965): “A D and I Compensated Optically Pumped Magnetometer”, Institute of Engineering Research, University of California, Report No. MT–65–4, NSF Grant No. GP–2604, October.
    [Google Scholar]
  17. DI, TORITTO, Piero, Tolesio (1966):“Magnetic Measurements of Rocks with a Rubidium Vapor Magnetometer”, Bachelor of Science Thesis, Massachusetts Institute of Technology, June.
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