Composite pickup coil for measurement of magnetic field components in a superconducting quantum interference device
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United States of America Patent
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Feb 22, 1994
Grant Date -
N/A
app pub date -
Dec 13, 1991
filing date -
Dec 21, 1990
priority date (Note) -
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Abstract
The invention concerns a pickup coil to measure components of gradients. The coil consists of two pairs of loops connected in series; these pairs are then connected in parallel. The coil so formed has a low inductance, and no shielding currents are induced to superconducting coils in homogeneous magnetic fields. One coil can be employed to measure several field components simultaneously when the coil is coupled to current sensing elements, for example to SQUIDS, so that the current components measured by the sensing elements do not couple magnetically because of the symmetry. This can be accomplished by connecting the said elements between terminals between the loops (5, 6 and 7, 8). The inductance of this coil can be further reduced by subdividing the loops into parts connected in parallel.
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