An absolute magnetometer based on dc Superconducting QUantum Interference Devices
Dipartimento di Energetica, Università dell'Aquila, Monteluco
di Roio, 67040 L'Aquila, Italy
2 Istituto di Elettronica dello Stato Solido, CNR, via Cineto Romano 42, 00156 Roma, Italy
Accepted: 22 July 1997
We propose a novel device, based on a series of dc SQUIDs (direct current Superconducting QUantum Interference Devices), each one with different sensitive area, that can be used to perform absolute measurements of magnetic field. With this array, we overcome the limit of a single dc SQUID of being sensitive only to variations of the linked magnetic flux. The overall voltage-flux characteristic of our device, in fact, has a non-periodic shape that allows a clear identification of the point with zero magnetic field. We present a discussion of the working principle and of the main characteristics, which have been partially tested on a prototype.
PACS: 85.25.Dq – Superconducting quantum interference devices (SQUIDs) / 07.55.Ge – Magnetometers for magnetic field measurements
© EDP Sciences, 1997