Superconducting quantum interference device: The most sensitive detector of magnetic flux

Hong Chang Yang*, Jau Han Chen, Shu Yun Wang, Chin Hao Chen, Jen Tzong Jeng, Ji Cheng Chen, Chiu Hsien Wu, Shu Hsien Liao, Herng Er Horng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


SQUIDs are the most sensitive devices in detecting the magnetic flux. The devices have been used to detect small magnetic field, current, voltage, inductance and magnetic susceptibility etc. In this work, we reported studies and applications of high-Tc YBa2Cu3O y SQUIDs. Two main techniques of depositing YBCO thin films are described; the characteristic of thin film and high-Tc SQUID are addressed. In magnetocardiography (MCG) application, we set up an electronic SQUID gradiometer system to optimize the environmental noises. The MCG measurements are performed in magnetically unshielded environments. In the SQUID NDE with the SQUID magnetometer and gradiometer were used to detect the buried flaws. The phase-depth relation of the buried flaw shows linear dependence. It was found that the phase-depth relation is useful to evaluate the depth of the buried flaws. In the scanning SQUID microscopy, the SQUID probe is used to detect the circuits using the lock-in detection technique. We successfully demonstrate that we can image the electrical circuits with the SQUID probe with samples at room temperature.

Original languageEnglish
Pages (from-to)9-18
Number of pages10
JournalTamkang Journal of Science and Engineering
Issue number1
Publication statusPublished - 2003 Mar


  • Electronic SQUID Gradiometer
  • Magnetocardiography
  • Nondestructive Evaluation
  • SQUID Microscopy

ASJC Scopus subject areas

  • General Engineering


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