High-Tc SQUID magnetometer with grain boundary junctions and its application in non-destructive evaluation

K. Chen; L. Chen; T. Yang; J. P. Wang; P. J. Wu; D. N. Zheng; Z. X. Zhao

doi:10.1016/S0921-4534(99)00568-7

High-T_c SQUID magnetometer with grain boundary junctions and its application in non-destructive evaluation

K. Chen, L. Chen, T. Yang, J. P. Wang, P. J. Wu, D. N. Zheng, Z. X. Zhao

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

We have fabricated and tested high-T_c magnetometers based on DC superconducting quantum interference device (SQUID). The SQUID was made from YBa₂Cu₃O_7-δ thin film deposited on SrTiO₃ bicrystal substrate. The noise spectrum was characterized at 77 K and showed that above 5 Hz, the magnetometer sensitivity is limited by a white noise level of around 2 × 10^-5 Φ₀/Hz_1/2, which corresponds to a magnetic field sensitivity of 100 fT/Hz^1/2. Below 5 Hz, the noise is dominated by 1/f noise. The magnetometer was used for non-destructive evaluation (NDE) of conducting aluminum structures by performing eddy current testing. By mapping out the field distribution with the SQUID magnetometer, flaws 10 mm below the surface can be clearly identified. The system can operate in a magnetically unshielded laboratory environment.

Original language	English (US)
Pages (from-to)	102-108
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	329
Issue number	2
DOIs	https://doi.org/10.1016/S0921-4534(99)00568-7
State	Published - 2000
Externally published	Yes

Bibliographical note

Funding Information:
This work is supported by the National Center of R&D for Superconductivity.

Keywords

High T
Magnetometer
NDE
SQUID

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title = "High-Tc SQUID magnetometer with grain boundary junctions and its application in non-destructive evaluation",

abstract = "We have fabricated and tested high-Tc magnetometers based on DC superconducting quantum interference device (SQUID). The SQUID was made from YBa2Cu3O7-δ thin film deposited on SrTiO3 bicrystal substrate. The noise spectrum was characterized at 77 K and showed that above 5 Hz, the magnetometer sensitivity is limited by a white noise level of around 2 × 10-5 Φ0/Hz1/2, which corresponds to a magnetic field sensitivity of 100 fT/Hz1/2. Below 5 Hz, the noise is dominated by 1/f noise. The magnetometer was used for non-destructive evaluation (NDE) of conducting aluminum structures by performing eddy current testing. By mapping out the field distribution with the SQUID magnetometer, flaws 10 mm below the surface can be clearly identified. The system can operate in a magnetically unshielded laboratory environment.",

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author = "K. Chen and L. Chen and T. Yang and Wang, {J. P.} and Wu, {P. J.} and Zheng, {D. N.} and Zhao, {Z. X.}",

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AU - Chen, K.

AU - Chen, L.

AU - Yang, T.

AU - Wang, J. P.

AU - Wu, P. J.

AU - Zheng, D. N.

AU - Zhao, Z. X.

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N2 - We have fabricated and tested high-Tc magnetometers based on DC superconducting quantum interference device (SQUID). The SQUID was made from YBa2Cu3O7-δ thin film deposited on SrTiO3 bicrystal substrate. The noise spectrum was characterized at 77 K and showed that above 5 Hz, the magnetometer sensitivity is limited by a white noise level of around 2 × 10-5 Φ0/Hz1/2, which corresponds to a magnetic field sensitivity of 100 fT/Hz1/2. Below 5 Hz, the noise is dominated by 1/f noise. The magnetometer was used for non-destructive evaluation (NDE) of conducting aluminum structures by performing eddy current testing. By mapping out the field distribution with the SQUID magnetometer, flaws 10 mm below the surface can be clearly identified. The system can operate in a magnetically unshielded laboratory environment.

AB - We have fabricated and tested high-Tc magnetometers based on DC superconducting quantum interference device (SQUID). The SQUID was made from YBa2Cu3O7-δ thin film deposited on SrTiO3 bicrystal substrate. The noise spectrum was characterized at 77 K and showed that above 5 Hz, the magnetometer sensitivity is limited by a white noise level of around 2 × 10-5 Φ0/Hz1/2, which corresponds to a magnetic field sensitivity of 100 fT/Hz1/2. Below 5 Hz, the noise is dominated by 1/f noise. The magnetometer was used for non-destructive evaluation (NDE) of conducting aluminum structures by performing eddy current testing. By mapping out the field distribution with the SQUID magnetometer, flaws 10 mm below the surface can be clearly identified. The system can operate in a magnetically unshielded laboratory environment.

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KW - SQUID

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