Three-dimensional positioning setup for magnetometer sensors

As the sensors of many magnetometers, such as SQUID magnetometers, are not directly accessible, their spatial location is often known only approximately. To be able to position such sensors more accurately, a novel measuring setup has been developed to determine the sensor location by means of magnetic measurements. The system has a resolution of better than 0.1 mm. It can be used with virtually any magnetometer that is capable of working in inhomogeneous fields. Measurements with SQUID's inside two different commercial Dewars yielded out-of-axis sensor displacements of 1.6 mm and 7.5 mm, which show clearly that the performing of such measurements is essential in experiments where the exact sensor location could be crucial.