A three-axial search coil magnetometer optimized for small size, low power, and low frequencies

Asaf Grosz, Eugene Paperno, Shai Amrusi, Boris Zadov

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


A compact and sensitive three-axial search coil magnetometer has been designed, built, and tested. The magnetometer sensitivity threshold equals 12 pT/Hz0.5 at 1 Hz, and the magnetometer dimensions are 72 mm × 69 mm × 69 mm. All the magnetometer coils, the electronics, and batteries are accommodated within a single electrostatic shield and a single housing. A close to 2 aspect ratio (30 mm diameter, 58 mm total length) of the search coils provides a very high (∼ 70%) volume utilization factor. Such a small aspect ratio is obtained due to employing 30-mm diameter, 4-mm thick flux concentrators. The magnetometer is optimized for 20 mHz to 7 Hz frequencies and for ultra-low (252 μW) power consumption. The ultra-low-power consumption enables a seven-year continuous operation from the four 1/2AA lithium batteries. The effect of the integration of three orthogonal search coils on the magnetometer sensitivity and accuracy has been investigated.

Original languageEnglish
Article number5585675
Pages (from-to)1088-1094
Number of pages7
JournalIEEE Sensors Journal
Issue number4
StatePublished - 25 Feb 2011


  • Compact
  • low frequency
  • magnetometer
  • search coil
  • three-axial
  • ultra-low power

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering


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