Compact broadband gradiometric induction magnetometer system

In this paper we describe two versions of a compact broadband ferrite based induction magnetometer system which span an operating bandwidth from 1 mHz to 1 MHz. In order to produce this compact system it was necessary to cons ider both the design of the pick up coils and the signal processing electro nics. Here, we present an alternative to the traditional analogue integrato r technique and conclude that this leads to significant advantages in bandw idth, long term stability and weight of the coils. (C) 1999 Elsevier Scienc e S.A. All rights reserved.