Title :
Construction and measurements of HTS DC SQUID electronic gradiometer to be used in NDE systems
Author :
Jinyoung Kim ; Joonhee Kang ; Eunhong Lee ; I-Hun Song ; Junho Gohng ; Hahn, T.S.
Author_Institution :
Dept. of Phys., Univ. of Inchon, South Korea
fDate :
6/1/1999 12:00:00 AM
Abstract :
We have designed a non-destructive evaluation system by using an electronic gradiometer constructed with two DC SQUID magnetometers. Typical flux modulation of the SQUIDs used in this work was about 30 /spl mu/V and the noise at 10 Hz was about 14 /spl mu//spl Phi//sub 0///spl radic/Hz. The system includes a non-magnetic stainless steel dewar and a set of coaxial exciting coils, which was used to induce an eddy current in the test piece. The sample motion stage and the SQUIDs were computer controlled and the output data from the electronic gradiometer was obtained by using Labview software.
Keywords :
SQUID magnetometers; eddy current testing; high-temperature superconductors; HTS DC SQUID magnetometer; Labview software; computer control; eddy current; electronic gradiometer; flux modulation; noise; nondestructive evaluation; High temperature superconductors; Magnetic field measurement; Magnetic flux; Magnetic noise; SQUID magnetometers; Substrates; Superconducting coils; Superconducting device noise; Superconducting magnets; Working environment noise;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
