Electronic high-temperature radio frequency superconducting quantum interference device gradiometers for unshielded environment

Autor:	G. Ockenfuss, Jürgen Schubert, P. David, Willi Zander, J. Borgmann, Alex I. Braginski, Ralph Otto
Rok vydání:	1997
Předmět:	Superconductivity Physics business.industry Magnetometer Gradiometer law.invention Magnetic field SQUID Optics Nuclear magnetic resonance Common-mode rejection ratio law Radio frequency business Instrumentation Sensitivity (electronics)
Zdroj:	Review of Scientific Instruments. 68:2730-2734
ISSN:	1089-7623 0034-6748
Popis:	This article will discuss improved electronically formed gradiometers based on high-temperature radio frequency (rf) superconducting quantum interference device (SQUID) magnetometers. For gradiometer balancing, a system of adjustable superconducting plates was developed. This technique was used to build first- and second-order, axial gradiometers with adjustable baselines, which operate at 77 K. Each magnetometer combines a washer rf-SQUID with bulk or a thin-film flux concentrator in flip chip geometry. In an unshielded environment, the magnetic field sensitivity in the white noise region is about 80 fT/√Hz for first-order and 150 fT/√Hz for second-order gradiometer. Common mode rejection could be balanced to better than 104 for uniform background fields and better than 200 for gradient fields.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e9621bde76bef858a2856b96b9682c32 https://doi.org/10.1063/1.1148187 Zobrazit plný text záznamu