| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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A Room-Temperature Pre-calibration Procedure for Gradiometer Sifting |
| ZHANG Shu-Lin1,2, LIU Yang-Bo1,2, LIU Ming3, WANG Yong-Liang1, KONG Xiang-Yan1, XIE Xiao-Ming1**
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1State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050
2Graduate University of the Chinese Academy of Sciences, Beijing 100190
3Department of Electronic Science and Technology, University of Science and Technology of China, Hefei 230026
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| Cite this article: |
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ZHANG Shu-Lin, LIU Yang-Bo, LIU Ming et al 2011 Chin. Phys. Lett. 28 038501 |
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Abstract In order to detect extremely weak magnetic signals, superconducting quantum interference device (SQUID) gradiometers are widely used to suppress environmental noise. A hardware SQUID gradiometer consists of a niobium gradio-antenna and an SQUID, which are coupled via an input coil. Here gradiometer imbalance may greatly reduce its noise suppression performance. The gradiometer balance depends on the geometrical forms of the antenna wound by niobium wire. We describe a simple method based on Faraday's law for the pre-calibration of the gradiometer balance at room temperature, before the gradiometer is set up. The pre-calibrating results are compared with the measured balance of an SQUID gradiometer system. This method may be used for sifting hardware gradiometers for multi-channel systems.
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| Keywords:
85.25.Dq
06.20.fb
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Received: 19 November 2010
Published: 28 February 2011
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| PACS: |
85.25.Dq
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(Superconducting quantum interference devices (SQUIDs))
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06.20.fb
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(Standards and calibration)
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