Open AccessLaser‐controlled superconducting switch for low‐field NMR applications
Author(s) -
Lechéa N.,
FilloyCorbrion C.,
Holé S.
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2013.1771
Subject(s) - inductance , magnetic field , materials science , laser , magnet , superconductivity , field (mathematics) , nuclear magnetic resonance , optoelectronics , optical switch , laser beams , optics , electrical engineering , condensed matter physics , physics , engineering , voltage , mathematics , pure mathematics , quantum mechanics
In the case of a low‐field nuclear magnetic resonance (NMR) system, the sensible magnetic sensor can be screened or even damaged by the large magnetic field produced during the polarisation phase. A switch is then necessary to preserve this sophisticated sensor. A simple and efficient switch is described here. It is made of a twisted and wound wire heated by a laser beam, in which the alignment is simple by construction. The switch can be used without any additional contact in sensing coils, has a low inductance and flips within milliseconds. It is shown that the switch resistance in open conditions is sufficient for low‐field NMR applications and that a memory behaviour can be exhibited.