Noise characteristics of high-Tc YBa2Cu3Oy SQUID gradiometers

Hong Chang Yang*, Jen Tzong Jeng, Herng Er Horng, Shu Yun Wang, Shou Yen Hung, Ji Cheng Chen, Jau Han Chen


研究成果: 雜誌貢獻期刊論文同行評審

2 引文 斯高帕斯(Scopus)


We studied the field noise of high-Tc YBa2Cu3Oy SQUID gradiometers in moving environments. The superconducting quantum interference devices (SQUID) magnetometers were in planar and axial configurations. In shielded environment, the magnetometer shows a gradient noise of ∼0.17 pT/cmHz1/2 at 1 Hz and ∼5.1 fT/cm Hz1/2 at 1 kHz. In unshielded environments, a gradient noise of 6.9 pT/cmHz1/2 was detected in our laboratory. The gradient noise at 1 Hz was increased to 0.38 nT/cmHz1/2 when the gradiometer system is moving at a speed of 20 mm/s. A moving gradiometer nondestructive evaluation system was set up to detect deep flaws. It was found there is a linear dependence between the phase of the differential field and the depth of flaws. The results are consistent with the SQUID magnetometer NDE system in which the SQUID magnetometer system is fixed and the samples were scanned under the system.

頁(從 - 到)290-294
期刊Physica C: Superconductivity and its applications
出版狀態已發佈 - 2002 2月 15

ASJC Scopus subject areas

  • 電子、光磁材料
  • 凝聚態物理學
  • 能源工程與電力技術
  • 電氣與電子工程


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