This thesis proposes a study
on the magnetic shielding property of YBa2Cu3O7-x ceramic superconductor
for accompanying with a high sensitivity magnetic sensor made
of ceramic superconductor at temperature of 77 K. In addition,
we also investigate influences of time-dependent magnetic field
and stationary magnetic field on superconductor material of
disk shape and hollow cylinder shape (both opened end and sealed
end). As the results of increasing the repetition of calcination
process to eliminate carbon form the superconductor material
and enhance a value of critical current density, they are found
that the ability to shield magnetic field of ceramic superconductor
relies on the value of the applied magnetic strength and the
critical current density of the bulk material. Among the studied
frequency range from 50 Hz - 1MHz, experiments are performed
by using a pick-up coil and the high sensitivity magnetic sensor
of high temperature superconductor at temperature of LN2. This
research is an application basis for high efficiency magnetic
shielding using superconductor in high resolution magnetic field
measurement devoid of external magnetic interference problem
such as electronic measuring system and medical instrument e.g.
SQUID magnetometer etc.
Back
