Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1994-09-15
1997-01-21
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetometers
505846, G01R 33035, H01L 3922
Patent
active
055962734
ABSTRACT:
DC-SQUID includes an input coil for transmitting an external magnetic field signal as a signal current from a detection coil, a washer coil to which the signal current is input as a signal magnetic flux, two Josephson devices for converting the signal magnetic flux transmitted to the washer coil to a signal voltage, shunt resistors and a damping resistor which are connected to each of the Josephson devices in parallel and in series respectively to extinguish the hysteresis of the current-voltage characteristic, and a feedback modulation coil to which a feedback and modulation current is transmitted from an external control circuit. The feedback modulation coil is arranged so as to linearly traverse over the upper portion or lower portion of the washer coil. The mutual inductance Mms between a washer coil and a feedback modulation coil is set to be smaller than the self inductance Lw of the washer coil, to thereby making the magnetic field sensitivity excellent, the SN ratio of an DS-SQUID is improved, and RF noises are reduced.
REFERENCES:
patent: 5306521 (1994-04-01), Shimizu et al.
Chiba Norio
Nakayama Satoshi
Yabe Satoru
Seiko Instruments Inc.
Snow Walter E.
LandOfFree
Highly sensitive magnetic field detector using low-noise DC SQUI does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Highly sensitive magnetic field detector using low-noise DC SQUI, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Highly sensitive magnetic field detector using low-noise DC SQUI will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2326605