Reference current optimizing apparatus for controlling...

Electricity: measuring and testing – Magnetic – Magnetometers

Reexamination Certificate

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Reexamination Certificate

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07453263

ABSTRACT:
A reference-current optimizing apparatus of a Reference Junction Double Relaxation Oscillation SQUID (RJ-DROS) with a signal SQUID and a reference junction for detecting a magnetic flux signal is provided. The reference-current optimizing apparatus includes a voltage controller for converting a digital signal into an output voltage; a buffer for receiving the output voltage and preventing a current generated in the RJ-DROS from flowing inversely into the reference-current optimizing apparatus; a low-pass filter for eliminating a noise mixed in an output voltage of the buffer; and a resistor for converting an output voltage of the low-pass filter into a current and providing both ends of the reference junction with the current. The reference-current optimizing apparatus may also include a preamplifier having a number of junction bipolar transistors.

REFERENCES:
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patent: 2002078325 (2002-10-01), None
Yong-Ho Lee et al., “Multichannel applications of double relaxation oscillation SQUIDs,”Superconductor, Science and Technology, 14(2001), pp. 1022-1026.
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M.J. Van Duuren et al., “The Use of (Double) Relaxation Oscillation SQUIDS as a Sensor,”IEEE Transactions on Applied Superconductivity, vol. 7, No. 2, Jun. 1997, pp. 3469-3472.
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S.A. Gugoshnikov et al., “Relaxation-Oscillation-Driven DC SQUIDs,”IEEE Transactions on Magnetics, vol. 25, No. 2, Mar. 1989, pp. 1178-1181.

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