Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1997-12-05
2000-03-28
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetometers
505846, G01R 33035, H01L 3924
Patent
active
060436492
ABSTRACT:
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.phi.). 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).
REFERENCES:
patent: 5387864 (1995-02-01), Gershenson et al.
Koch et al., "High performance superconducting quantum interference device feedback electronics" American Institute of Physics pp. 2968-2976 (1996).
Itozaki Hideo
Nagaishi Tatsuoki
Toyoda Haruhisa
Snow Walter E.
Sumitomo Electric Industries Ltd.
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