Subranging scheme for SQUID sensors

Details Subranging scheme for SQUID sensors Subranging scheme for SQUID sensors

Filed on

2008-01-29

Date issued

2008-01-29

Examiner

Aurora, Reena (Department: 2862)

Patent Class

Electricity: measuring and testing

SubClass

Magnetic

SubSubClass

Magnetometers

Type

Reexamination Certificate

Status

active

Patent number

07323869

Description

ABSTRACT:
A readout scheme for measuring the output from a SQUID-based sensor-array using an improved subranging architecture that includes multiple resolution channels (such as a coarse resolution channel and a fine resolution channel). The scheme employs a flux sensing circuit with a sensing coil connected in series to multiple input coils, each input coil being coupled to a corresponding SQUID detection circuit having a high-resolution SQUID device with independent linearizing feedback. A two-resolution configuration (course and fine) is illustrated with a primary SQUID detection circuit for generating a fine readout, and a secondary SQUID detection circuit for generating a course readout, both having feedback current coupled to the respective SQUID devices via feedback/modulation coils. The primary and secondary SQUID detection circuits function and derive independent feedback. Thus, the SQUID devices may be monitored independently of each other (and read simultaneously) to dramatically increase slew rates and dynamic range.

REFERENCES:
patent: 5141334 (1992-08-01), Castles
patent: 5469057 (1995-11-01), Robinson
patent: 6339328 (2002-01-01), Keene et al.
patent: 6377110 (2002-04-01), Cooper
patent: 6556153 (2003-04-01), Cardamone
patent: 2002/0060635 (2002-05-01), Gupta et al.
H. Myoren, et al., “Double Relaxation Oscillation SQUID with 4JL On-Chip Digital Flux Locked-Loop Circuit”, AIST (2004).

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