Development of the high-sensitive TDEM technique based on SQUID magnetometer.

概要

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The Metal Mining Agency of Japan(MMAJ) has developed two high-sensitive SQUID systems for the Time Domain Electromagnetic(TDEM) Survey. The first system had been completed in 2000 for civil engineering survey. MMAJ carried out some TDEM field trials outside magnetic shielding. We could achieve stable long-term operation of all three channels, and obtained good reproducibility of SQUID data and a good correlation between output signals of reference induction coils and the time derivative of SQUID signals in the last field trial on Awaji Island in June, 2001. The result of this trial indicates that the SOUTD magnetometer provides a better sienal-to-noise ratio than an induction coil particularly at late time.<BR>The second system for the mineral exploration has been just developed in February, 2002. The field check to assess performance of the second system also showed a good correlation between the SQUID and coil data at middle time. However, the second system could not take good data at late time because of low slew-rate of the SQUID magnetometer. MMAJ is overcoming this problem on low slew-rate to complete the TDEM system based on SQUID magnetometer for mineral exploration.
資源地質学会の論文