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

doi:10.1016/S0921-4534(01)01054-1

Noise characteristics of high-T_c YBa₂Cu₃O_y 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

Undergraduate Program of Electro-Optical Engineering

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

2 Citations (Scopus)

Abstract

We studied the field noise of high-T_c YBa₂Cu₃O_y 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/cmHz^1/2 at 1 Hz and ∼5.1 fT/cm Hz^1/2 at 1 kHz. In unshielded environments, a gradient noise of 6.9 pT/cmHz^1/2 was detected in our laboratory. The gradient noise at 1 Hz was increased to 0.38 nT/cmHz^1/2 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 language	English
Pages (from-to)	290-294
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	367
Issue number	1-4
DOIs	https://doi.org/10.1016/S0921-4534(01)01054-1
Publication status	Published - 2002 Feb 15

Keywords

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

Access to Document

10.1016/S0921-4534(01)01054-1

Cite this

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title = "Noise characteristics of high-Tc YBa2Cu3Oy SQUID gradiometers",

abstract = "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.",

keywords = "Electronic gradiometer, Field noise, Nondestructive evaluation, SQUID magnetometer",

author = "Yang, {Hong Chang} and Jeng, {Jen Tzong} and Horng, {Herng Er} and Wang, {Shu Yun} and Hung, {Shou Yen} and Chen, {Ji Cheng} and Chen, {Jau Han}",

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AU - Yang, Hong Chang

AU - Jeng, Jen Tzong

AU - Horng, Herng Er

AU - Wang, Shu Yun

AU - Hung, Shou Yen

AU - Chen, Ji Cheng

AU - Chen, Jau Han

PY - 2002/2/15

Y1 - 2002/2/15

N2 - 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.

AB - 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.

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