SUPERCONDUCTING QUANTUM INTERFEROMETER.

Abstract

This report is concerned with the application of superconducting quantum interference devices (SQUIDs) to measurement of magnetic fields. A brief description of superconducting loop interferometers is presented without invoking the phenomenon of Josephson tunneling. A simplified derivation of the SQUID transfer function is followed by analytical description of superconducting flux concentrators which are proposed for sensitivity enhancement. Noise fluctuations in thin-film bridges, used as weak-link junctions, are postulated and basic relationships are developed between the time correlation function for bridge voltage fluctuations and the space correlation function for vortex number density. Consideration is given to the dynamics of vortex motion and the results are used to derive a practical expression for noise spectral intensity. The use of two SQUIDs to implement a gradiometer is discussed along with frequency response and noise characteristics of a servo-type magnetometer. (Author)

Document Details

Document Type
Technical Report
Publication Date
May 01, 1967
Accession Number
AD0816213

Entities

People

  • Gordon L. Mccone

Tags

DTIC Thesaurus Topics

  • Frequency Response
  • Gradiometers
  • Interferometers
  • Magnetic Fields
  • Magnetometers
  • Measurement
  • Measuring Instruments
  • Thin Films
  • Transfer Functions

Fields of Study

  • Physics

Readers

  • Superconducting Magnet Technology
  • Theoretical Analysis.

Technology Areas

  • Quantum Computing
  • Quantum Science - Quantum Dots
  • Space