Two methods for a first order hardware gradiometer using two HTS SQUIDs

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Two different systems for noise cancellation (first order gradiometers) have been developed using two similar high temperature superconducting (HTS) SQUIDs. Analog gradiometry is accomplished in hardware by either (1) subtracting the signals from the sensor and background SQUIDs at a summing amplifier (parallel technique) or (2) converting the inverted background SQUID signal to a magnetic field at the sensor SQUID (series technique). Balance levels achieved are 2000 and 1000 at 20 Hz for the parallel and series methods respectively. The balance level as a function of frequency is also presented. The effect which time delays in the two sets of ... continued below

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5 p.

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Espy, M.A.; Flynn, E.R.; Kraus, R.H. Jr. & Matlachov, A. December 31, 1998.

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Description

Two different systems for noise cancellation (first order gradiometers) have been developed using two similar high temperature superconducting (HTS) SQUIDs. Analog gradiometry is accomplished in hardware by either (1) subtracting the signals from the sensor and background SQUIDs at a summing amplifier (parallel technique) or (2) converting the inverted background SQUID signal to a magnetic field at the sensor SQUID (series technique). Balance levels achieved are 2000 and 1000 at 20 Hz for the parallel and series methods respectively. The balance level as a function of frequency is also presented. The effect which time delays in the two sets of SQUID electronics have on this balance level is presented and discussed.

Physical Description

5 p.

Notes

OSTI as DE99002587

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  • Applied superconductivity conference, Palm Desert, CA (United States), 13-18 Sep 1998

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  • Other: DE99002587
  • Report No.: LA-UR--98-3910
  • Report No.: CONF-9809130--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 350916
  • Archival Resource Key: ark:/67531/metadc680572

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  • December 31, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Feb. 26, 2016, 9:31 p.m.

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Espy, M.A.; Flynn, E.R.; Kraus, R.H. Jr. & Matlachov, A. Two methods for a first order hardware gradiometer using two HTS SQUIDs, article, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc680572/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.