Method for controlling characteristics of double relaxation...

Electricity: measuring and testing – Magnetic – Magnetometers

Reexamination Certificate

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C505S846000

Reexamination Certificate

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07388371

ABSTRACT:
The present invention relates to a method of controlling the characteristics of a double relaxation oscillation SQUID having a reference junction. In the method of controlling characteristics of a reference junction-type double relaxation oscillation SQUID (RJ-DROS) having a signal SQUID and a reference junction, a reference DC current flows through the reference junction in order to control the characteristics of the DROS. A modulation width of an averaged relaxation voltage, which reacts to a magnetic flux, may be controlled at the reference junction. An amount (modulation depth) of an averaged relaxation voltage, which reacts to a magnetic flux, may be controlled at the reference junction. An amount of an operation application current may be controlled at the reference junction. Accordingly, the reference current of the reference junction can be changed by causing the current to flow through the reference junction. A magnetic flux-voltage characteristic and a transfer coefficient of the DROS can be easily controlled externally and the DROS can operate stably.

REFERENCES:
patent: 5406201 (1995-04-01), Kiryu et al.
patent: 2002078325 (2002-10-01), None
Kim et al., Effect of Additional Reference Current in a Reference Junction-Double Relaxation Oscillation SQUID (RJ-DROS). Mar. 2007, IEEE Transactions On Applied Superconductivity, vol. 17, No. 1.
“Multichannel applications of double relaxation oscillation SQUIDS”; Authors: Yong-Ho Lee, et al.; Institute of Physics Publishing, Supercond. Sci. Technol. 14, pp. 1022-1026 (2001).
“Two-Stage Integrated Squid Amplifier With Series Array Output”; Authosr: Richard P. Welty, et al.; IEEE Transactiond on Applied Superconductivity, vol. 3, No. 1, pp. 2605-2608 (1993).
“Digital Feedback loops for d.c. SQUIDS”;Auhtor: D. Drung; Cryogenics, vol. 26, pp. 623-627, (1986).
“Advanced Squid Read-Out Electronics”; Author: Dietmar Drung; Supplied by The British Library—“The worlds's knowledge”, pp. 63-116 (1996).
“(Double) relaxation oscillation SQUIDS with high flux-to-voltage transfer: Simulations and experiments”; Authors: D.J. Adelerhof, et al.; J.Appl. Phys.76; pp. 3875-3886 (1994).

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