SQUID-based rock magnetometer with open-ended horizontal roomtemperature access

Hermanus J.M. ter Brake, P. de la Court, Aufrid T.M. Lenferink, J.A. Ulfman, J.A. Ulfman, Jakob Flokstra

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We constructed a 3-channel SQUID-based rock magnetometer with an open-ended horizontal room-temperature access having an inner diameter of 38 mm. A refrigerator is incorporated for cooling two radiation shields so that an operating time can be realized of about 10 weeks with a reservoir volume of 26.7 litres. The temperature variation along the access is about 9 K. The rock magnetometer is equipped with a special sensing-coil set of which the signal uniformity with respect to magnetic dipoles is about a factor of two better than that of conventional vertical-access systems. The intrinsic noise level of the system is 10-11Am2/sqrt{Hz}.
Original languageUndefined
Pages (from-to)1110-1113
Number of pages4
JournalIEEE transactions on magnetics
Issue number23
Publication statusPublished - 1987


  • METIS-129127
  • IR-24327

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