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Superconducting Quantum Interference Device (SQUID) Magnetometers

  • Matthias SchmelzEmail author
  • Ronny Stolz
Chapter
Part of the Smart Sensors, Measurement and Instrumentation book series (SSMI, volume 19)

Abstract

Direct Current Superconducting QUantum Interference Devices (dc SQUIDs) are sensors for the detection of magnetic flux or any physical quantity that can be transformed into magnetic flux. They consist of a superconducting loop interrupted by two resistively shunted Josephson tunnel junctions. Typically operated at 4.2 K, they exhibit magnetic flux noise levels of the order of 1 μΦ0/Hz1/2, corresponding to a noise energy of 10−32 J/Hz1/2. They can be used for example as magnetometers, magnetic gradiometers, current sensors and voltmeters, susceptometers or (rf) amplifier. With their large bandwidth and flat frequency response ranging from dc to GHz, they are excellent suited for a wide variety of applications, such as e.g. biomagnetism and geophysical exploration to the detection of gravity waves and magnetic resonance.

Keywords

Josephson Junction Junction Capacitance Rapid Single Flux Quantum Input Coil Flux Noise 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors highly acknowledge Dr. S. Anders for careful proofreading and many stimulating discussions.

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© Springer International Publishing Switzerland 2017

Authors and Affiliations

  1. 1.Leibniz Institute of Photonic TechnologyJenaGermany

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