It consists of a ring of superconducting material with two side arms Aand B. P and Q are the Josephson junctions (insulating layers) of
different thickness. Let p and q represent the phase differencebetween the input current and output current while passing through theinsulator junctions P and Q respectively. In the absence of magneticfield, these two phases are equal. i.e. p = q = 0.When a magnetic field is applied, the phase difference between thereunited currents is directly proportional to the magnetic flux passing through the ring. It can be shown that total current comingout of the ring, I = 2I0 sin0 cos(e/hc)This expression indicates that the output current varies with theapplied magnetic flux and shows oscillations.SOUID is used as a very sensitive magnetometer which can measure veryweak magnetic fields of the order of 10-13 Tesla.
different thickness. Let p and q represent the phase differencebetween the input current and output current while passing through theinsulator junctions P and Q respectively. In the absence of magneticfield, these two phases are equal. i.e. p = q = 0.When a magnetic field is applied, the phase difference between thereunited currents is directly proportional to the magnetic flux passing through the ring. It can be shown that total current comingout of the ring, I = 2I0 sin0 cos(e/hc)This expression indicates that the output current varies with theapplied magnetic flux and shows oscillations.SOUID is used as a very sensitive magnetometer which can measure veryweak magnetic fields of the order of 10-13 Tesla.
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