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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (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.

Original languageEnglish
Pages (from-to)290-294
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue number1-4
Publication statusPublished - 2002 Feb 15


  • Electronic gradiometer
  • Field noise
  • Nondestructive evaluation
  • SQUID magnetometer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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