Two Methods for a First Order Hardware Gradiometer Using Two HTS SQUID's

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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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Espy, M.A.; Flynn, E.R.; Kraus, R.H., Jr. & Matlachov, A. September 15, 1998.

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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 SQUID electronics have on this balance level is presented and discussed.

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OSTI as DE00761446

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  • Applied Superconductivity, Palm Desert, CA (US), 09/13/1998--09/18/1998

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  • Report No.: LA-UR-98-3910
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 761446
  • Archival Resource Key: ark:/67531/metadc725569

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  • September 15, 1998

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  • Sept. 29, 2015, 5:31 a.m.

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  • May 6, 2016, 2:08 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 SQUID's, article, September 15, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc725569/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.