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Vol. 9, Special Issue, December 2010, pp.171-181



Sensitivity Limits of a Magnetometer with an Air-core Pickup Coil


Kunihisa Tashiro, Shin-ichiro Inoue and Hiroyuki Wakiwaka

Department of Electrical and Electronic Engineering,

Shinshu University, Nagano wakasato 4-17-1, 380-8553, Japan

Tel.: +81-26-269-5216

E-mail: tashiro@shinshu-u.ac.jp



Received: 27 September 2010   /Accepted: 30 November 2010   /Published: 30 December 2010


Abstract: Sensitivity limits of magnetometers with air-core pickup coils are considered through three basic principles, Faradayís law, the definition of inductance and Ohmís law. This paper presents two simple equivalent circuit models for voltage detection and current detection, and describes their sensitivity with eight parameters. Both models require different methodology for optimal pickup coil design. The calculated results are in agreement with experimental results, and illustrate the advantages of magnetometers based on current detection model.


Keywords: Induction magnetometer, Air-core coil, Detection model, Equivalent circuit, Sensitivity limits.


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