Two methods for a first order hardware gradiometer using two HTS SQUIDs
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.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 350916
- Report Number(s):
- LA-UR-98-3910; CONF-9809130-; ON: DE99002587; TRN: AHC29921%%101
- Resource Relation:
- Conference: Applied superconductivity conference, Palm Desert, CA (United States), 13-18 Sep 1998; Other Information: PBD: [1998]
- Country of Publication:
- United States
- Language:
- English
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