@article{PAR00012156,
  title = {{G}limpse into the design of {MRS} instrument},
  author = {{L}egchenko, {A}natoli and {P}ierrat, {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {M}agnetic {R}esonance {S}ounding method ({MRS}) was developed in the former {USSR} in the late 1970s. {N}owadays, available {MRS} instruments are more compact and reliable, and enormous progress has been made in electronics, computers and materials. {T}herefore, we can hope that it may be possible to increase the maximum depth of water detection and to improve the resolution of the method by using a larger current in the loop. {Q}uite naturally, the questions arise: what are the practical limits of the {MRS} method and how much should be transmitting power to get the maximum depth of investigation? {I}n this paper, we analyse the depth of groundwater detection and the vertical resolution of the {MRS} assuming different loops and different power levels of the current generator. {T}he originality of our approach consists of a joint analysis of the maximum depth of investigation using acceptable loop voltage and the modifications in the instrument design necessary for the improvements. {W}e show that even under very favourable conditions it would be difficult to get significant improvement in the depth of investigation using currently available instruments. {F}or example, under favourable noise conditions when rocks have low electrical conductivity and are non-magnetic, a 20 m thick water saturated sand layer can be detected at a depth of about 325 m using an existing instrument (4 k{V} of the loop voltage) with a 400 x 400 m(2) square loop. {A} 20% increase in the detection depth (390 m instead of 325 m) requires more powerful electronic equipment (16 k{V} instead of 4 k{V}) thus rendering the {MRS} system larger and heavier. {H}owever, using a 16 k{V} instrument allows us to increase the resolution depth by about 80% (from 120 m to 215 m). {W}hen rocks are electrically conductive, the screening of the {MRS} signal limits the depth of investigation and allows for only minor improvements even with a much more powerful current generator.},
  keywords = {},
  booktitle = {},
  journal = {{N}ear {S}urface {G}eophysics},
  volume = {12},
  numero = {2},
  pages = {297--308},
  ISSN = {1569-4445},
  year = {2014},
  DOI = {10.3997/1873-0604.2014006},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00012156},
}