Integrated-type squid magnetometer and system for...

G - Physics – 01 – R

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G01R 33/035 (2006.01) A61B 5/05 (2006.01)

Patent

CA 2017299

A pickup coil and a planar type SQUID are formed integrally on a single substrate to form a SQUID magnetometer. The SQUID is disposed on the surface of a projecting portion of the substrate and an insulating layer for spacing is laminated on the SQUID. The top, bottom and side surfaces of the assembly of the SQUID and insulating layer covering the same are all covered with a superconducting layer to form a magnetic shield for enclosing the SQUID. The magnetic shield is remote from the planar type pickup coil disposed on the remaining portion of the substrate by a distance which is equal to or greater than a length of one side of the size of the magnetic shield, thereby preventing magnetic flux distortion due to the presence of the magnetic shield from distrubing coil balance of the pickup coil.

L'invention est un magnétomètre à SQUID dans lequel la bobine de sondage et un SQUID planar sont intégrés à un même substrat. Le SQUID est monté à la surface d'une partie en saillie du substrat et une couche d'espacement isolante est superposée au SQUID. Les surfaces de dessus , de dessous et de côté du groupe SQUID et de sa couche isolante sont recouvertes d'une couche supraconductrice pour former un blindage magnétique servant à protéger le SQUID. Le champ magnétique est tenu à l'écart de la bobine de sondage de type planar montée sur la partie restante du substrat, d'une distance égale ou supérieure à la longueur de l'un des côtés du blindage magnétique. Les distorsions d'origine magnétique sont ainsi éliminées, la présence du blindage magnétique empêchant le champ magnétique de perturber le point d'équilibre de la bobine de sondage.

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