TITLE

Axial high-temperature superconducting-quantum-interference-device gradiometer composed of magnetometers with a monolithic feedback and compensation coil

AUTHOR(S)
Yokosawa, Koichi; Oyama, Hiroshi; Kuriki, Shinya; Suzuki, Daisuke; Tsukada, Keiji
PUB. DATE
April 2001
SOURCE
Applied Physics Letters;4/30/2001, Vol. 78 Issue 18, p2745
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A first-order axial gradiometer has been constructed using two high-critical-temperature superconducting-quantum-interference-device magnetometers having a double-pickup loop configuration on bicrystal substrates. The magnetometer, which had a slot-type structure but no weak links on the pickup loops, can be operated steadily in an unshielded environment after in situ cooling. The gradiometer was formed by connecting the feedback and the compensation coils of the two magnetometers in series using a normal conductive wire. Sufficiently high noise reduction (31 dB at 1 Hz) was achieved without any need for adjustments and low-noise magnetocardiograms were obtained with the gradiometer in a moderately magnetically shielded room. © 2001 American Institute of Physics.
ACCESSION #
4711329

 

Related Articles

  • Integrated YBa[sub 2]Cu[sub 3]O[sub 7-x] magnetometer for biomagnetic measurements. Drung, D.; Ludwig, F. // Applied Physics Letters;3/4/1996, Vol. 68 Issue 10, p1421 

    Fabricates direct current superconducting quantum interference device (SQUID) magnetometer using YBa[sub 2]Cu[sub 3]O[sub 7-x] (YBCO)-SrTiO[sub 3]-YBCO multilayer process. Insertion of the SQUID robe in biomagnetic dewar; Observation of biomagnetic measurements for integrated magnetometer;...

  • Transfer function and noise properties of YBa[sub 2]Cu[sub 3]O[sub 7-δ] direct-current superconducting-quantum-interference-device magnetometers with resistively shunted inductances. Kahlmann, F.; Booij, W. E.; Booij, W.E.; Blamire, M. G.; Blamire, M.G.; McBrien, P. F.; McBrien, P.F.; Tarte, E. J.; Tarte, E.J.; Peng, N. H.; Peng, N.H.; Jeynes, C.; Romans, E. J.; Romans, E.J.; Pegrum, C. M.; Pegrum, C.M. // Applied Physics Letters;7/24/2000, Vol. 77 Issue 4 

    Studies the transfer function and noise properties of direct-current superconducting-quantum-interference-device (SQUID) magnetometers with resistively shunted inductances. Maximum voltage modulation depth and calculated values based on the theoretical predictions by Enpuku, et. al.; White...

  • Low 1/f flux noise in sputtered YBa2Cu3O7-x bicrystal dc-superconducting quantum interference... Sarnelli, E.; Camerlingo, C.; Russo, M.; Torrioli, G.; Castellano, M. G. // Journal of Applied Physics;10/15/1997, Vol. 82 Issue 8, p3922 

    Analyzes the YBa2Cu3O7-x bicrystal dc-superconducting quantum interference devices (SQUID) and single layer magnetometers working at 77 K. Different geometrical configurations of SQUID characteristic parameters; Comparison between experimental H values and calculated ones by using Eq; Behavior...

  • High performance dc SQUID magnetometers with single layer YBa[sub 2]Cu[sub 3]O[sub 7-x] flux.... Koelle, D.; Miklich, A.H. // Applied Physics Letters;12/27/1993, Vol. 63 Issue 26, p3630 

    Details the fabrication of direct current (dc) superconducting quantum interference device (SQUID) magnetometers with single film YBa[sub 2]Cu[sub 3]O[sub 7-x] flux transformers. Attachment of the transformer to a loop directly coupled to a dc SQUID; Values of the lowest magnetic field noise...

  • Low noise YBa[sub 2]Cu[sub 3]O[sub 7-x] SQUID magnetometers operated with additional positive.... Drung, D.; Dantsker, E.; Ludwig, F.; Koch, H.; Kleiner, R.; Clarke, John; Krey, S.; Reimer, D.; David, B.; Doessel, O. // Applied Physics Letters;3/25/1996, Vol. 68 Issue 13, p1856 

    Presents a low noise YBa[sub 2]Cu[sub 3]O[sub 7-x] superconducting quantum interference devices magnetometers operated with additional positive feedback. Use of flux locked loop; Obtainment of high quality magnetocardiograms.

  • Unlocked detection of SQUID signals: Theory and design. Dubuc, C.; Benhida, K.; Bloyet, D. // Review of Scientific Instruments;May91, Vol. 62 Issue 5, p1333 

    We describe the principle and implementation of a new unlocked processing of SQUID signals. A digital interpolation is achieved by using the periodicity of the voltage-flux transfer characteristic. The method is analyzed and the choice of the main parameters is discussed. A practical...

  • A miniature magnetometer based on the superconducting quantum interference device with direct... Polushkin, V.; Wallis, M.; Glowacka, D.; Matthews, A.; Lumley, John M. // Review of Scientific Instruments;Mar97, Vol. 68 Issue 3, p1461 

    Develops a novel miniature superconducting quantum interference device magnetometer with direct readout electronics. High flux-to-voltage transfer factor achieved without additional positive feedback; Flux resolution corresponding to a magnetic moment sensitivity; Study of the dynamic...

  • Four layer monolithic integrated high T[sub c] dc SQUID magnetometer. Hilgenkamp, J.W.M.; Brons, G.C.S. // Applied Physics Letters;6/20/1994, Vol. 64 Issue 25, p3497 

    Fabricates and characterizes a YBa[sub 2]Cu[sub 3]O[sub 7-x] based monolithic integrated direct current superconducting quantum interference device magnetometers. Composition of the devices; Operation of the first realization up to 73 Kelvin; Observation of a maximum voltage modulation of 32...

  • An 8-T superconducting quantum interference device magnetometer. Genna, J. C.; Biston, S.; Cotillard, J. C.; Lethuillier, P.; Faurin, C.; Hostachy, P.; Rocca-Valero, R.; Roullier, J. // Review of Scientific Instruments;Jul1991, Vol. 62 Issue 7, p1824 

    A variable-temperature (1.4–320 K) superconducting quantum interference device magnetometer, operating in magnetic fields up to 8 T, has been built. The sensitivity is 2×10-7 emu in low fields and 2×10-6 in high fields. The apparatus allows magnetization and anisotropy...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics