Composite pickup coil for measurement of magnetic field componen

Details Composite pickup coil for measurement of magnetic field componen Composite pickup coil for measurement of magnetic field componen

1991-12-13

1994-02-22

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

336232, 505846, G01R 3302

Patent

active

052891216

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.

REFERENCES:
patent: 4320341 (1982-03-01), Lutes
T. Ryhanen et al, "SQUID Magnetometers for Low-Frequency Applications", Journal of Low Temperature Physics, vol. 76 (Sep. 1989), pp. 287-386.
J. Knuutila et al, "Design Considerations for Multichannel SQUID Magnetometers", Superconducting Quantum Interference Devices and Their Applications SQUID '85, 1985, pp. 939-944 (no month).
M. Kajola et al, "A 24-Channel Magnetometer for Brain Research", Advances in Biomagnetism, 1990, pp. 673-676 (no month).
M. B. Ketchen, "Design of Improved Integrated Thin-Film Planar dc SQUID Gradiometers", Journal of App. Physics, vol 58 (Dec. 1985), pp. 4322-4325.
J. E. Zimmerman, "Sensitivity Enhancement of Superconducting Quantum Interference Devices . . . ", Journ. of App. Physics, vol 42, pp. 4483-4487 (Oct. 1971).
D. Drung et al, "Low-Noise High-Speed Dc Superconducting Quantum Interference Device Magnetometer with Simplified Feedback Electronics", Applied Physics Letters, vol 57, pp. 406-408 (Jul. 1990).

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