Analysis of a Digital SQUID Magnetometer Utilizing a Direct Coupled DC SQUID for Improved Magnetic Field Resolution

Magnetometers utilizing digital SQUIDs are good candidates for high sensitive measurements of rapidly varying magnetic fields in a wide range. The association of its very large dynamic range together with the very high field resolution of an analog SQUID leads to new generation of SQUID sensors. Thi...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2007-06, Vol.17 (2), p.746-749
Main Authors: Reich, T., Ortlepp, T., Uhlmann, F.H.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Couplings
Design. Technologies. Operation analysis. Testing
Digital
Digital circuits
Digital SQUID
Dynamic range
Dynamical systems
Dynamics
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
General equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Integrated circuits
Interference
lumped elements description
Magnetic analysis
Magnetic field measurement
Magnetic fields
Magnetic sensors
Magnetometers
Numerical simulation
on-chip feedback
Physics
RSFQ
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Sensor systems
Sensors
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
SQUID magnetometers
SQUIDs
Superconducting devices
Superconducting quantum interference devices
unshielded environment
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Description
Summary:Magnetometers utilizing digital SQUIDs are good candidates for high sensitive measurements of rapidly varying magnetic fields in a wide range. The association of its very large dynamic range together with the very high field resolution of an analog SQUID leads to new generation of SQUID sensors. This paper describes a hybrid magnetometer system, which is designed for applications in unshielded environment. It uses the flux quanta counting digital SQUID to operate in large environmental fields. We present a detailed study for the dynamic properties of the sensor system with focus on the digital SQUID part. We use a numerical simulation technique to investigate the interference between analog and digital sub-systems and characterize the hybrid magnetometer system performance.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2007.898700