Title :
Development of a high-Tc first-order gradiometer system
Author :
Kim, In-Seon ; Kim, Jin-Mok ; Lim, Hae-Ryong ; Park, Yong Ki
Author_Institution :
Korea Res. Inst. of Standards & Sci., Taejon, South Korea
fDate :
3/1/2001 12:00:00 AM
Abstract :
The high-Tc superconducting quantum interference device (SQUID) gradiometer system was developed for operation in unshielded environment. The system consists of the first-order gradiometer and the flux-locked loop electronics. YBa2Cu3O7 single-layer first-order SQUID gradiometers were fabricated on 15 mm×7.5 mm SrTiO3 bicrystal substrates with a baseline of 7 mm. The gradient sensitivities at 77 K and 100 Hz were 0.1 pT/(cm√Hz) in magnetic shielding and 1.4 pT/(cm√Hz) when operated unshielded in our laboratory. The high-Tc SQUID gradiometer system demonstrated successful measurement of small magnetic fields in a laboratory environment without any shields
Keywords :
SQUID magnetometers; barium compounds; high-temperature superconductors; magnetic field measurement; superconducting device noise; yttrium compounds; 100 Hz; 7 mm; 77 K; HTSC first-order SQUID gradiometer; SrTiO3; SrTiO3 bicrystal substrate; YBa2Cu3O7; YBa2Cu3O7 single-layer first-order SQUID gradiometers; baseline; flux-locked loop electronics; gradient sensitivities; high-Tc first-order gradiometer system; laboratory environment; magnetic shielding; small magnetic field measurement; unshielded environment; Fabrication; Geophysical measurements; Interference; Magnetic field measurement; Magnetic shielding; SQUIDs; Substrates; Superconducting magnets; Transistors; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
