Voltage step up circuit for magnetometric sensor

G - Physics – 01 – R

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G01R 33/035 (2006.01)

Patent

CA 2223767

The present invention provides an improved and simplified voltage step-up circuit (2) for a SQUID magnetometric sensor (1), which provides step-up of a voltage signal generated by a SQUID element (11). The SQUID element is exited by a modulated signal using the FLL method. In an example, a step-up means (22) comprises only one step-up transformer (22T) working at room temperature and an electronic amplifier (22A). The voltage signal is first stepped up by the transformer. A signal processing means (23) processes the stepped up signal with the modulation signal to output a magnetic field measurement signal (V~). In another example, a bias current source (21) is also connected to terminals between SQUID element (11) and the transformer (22). A series resistor is connected between the transformer and one of the terminals. This allows a reduction in the number of terminals between the SQUID sensor (1) and the circuit (2).

Circuit élévateur de tension (2) simplifié et amélioré pour capteur magnétométrique SQUID (1), permettant d'élever le signal de tension produit par un élément SQUID (11). L'élément SQUID est excité par un signal modulé au moyen de la méthode FLL. Suivant un exemple, un moyen d'élévation (22) comprend seulement un transformateur élévateur (22T) fonctionnant à température ambiante et un amplificateur électronique (22A). Le signal de tension est d'abord élevé par le transformateur. Un moyen de traitement de signal (23) traite le signal élevé avec le signal de modulation afin de produire un signal de mesure de champ magnétique (V~). Suivant un autre exemple, une source de courant de polarisation (21) est également raccordée aux bornes entre l'élément SQUID (11) et le transformateur (22). Une résistance série est branchée entre le transformateur et une des bornes. Cela permet de réduire le nombre de bornes entre le capteur SQUID (1) et le circuit (2).

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