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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 7248044 B1

PDFFull Text
Expired
Date of Patent:
Jul. 24, 2007

Filed:

Dec. 01, 2006

Magnetic flux measuring apparatus by hysteresis characteristic type digital fll using counter system for squid

Applicants:

Koichiro Kobayashi, Morioka, JP;

Daisuke Oyama, Morioka, JP;

Masahito Yoshizawa, Morioka, JP;

Kenji Nakai, Morioka, JP;

Takayuki Simizu, Morioka, JP;

Tomoaki Ueda, Kyoto, JP;

Inventors:

Koichiro Kobayashi, Morioka, JP;

Daisuke Oyama, Morioka, JP;

Masahito Yoshizawa, Morioka, JP;

Kenji Nakai, Morioka, JP;

Takayuki Simizu, Morioka, JP;

Tomoaki Ueda, Kyoto, JP;

Assignee:

Japan Science and Technology Agency, Kawaguchi-shi, JP;

Attorney:

Oblon, Spivak, McClelland, Maier & Neustadt, P.C.

Primary Examiner:

Bot Ledynh

Int. Cl.
CPC ...
G01R 33/035 (2006.01);
U.S. Cl.
CPC ...
Abstract

In a SQUID magnetometer, high resolution, a high slew rate, and a high dynamic range are achieved without using expensive circuit components having a large number of processing bits and enabling a high speed processing operation. A digital FLL circuit using a double counter system is provided. This circuit utilizes two or more counters, for example, a change range counter in a digital FLL for carrying out a processing operation at a high speed and a reproducing counter in a control/measuring computer. In addition, in the present invention, hysteresis characteristics having a 1Φpositive margin is used. That is, a change of a state of a magnetic flux is counted by means of a counter. At the time of this change, control is made so as to track a different channel between cases in which a magnetic flux increases and decreases, thereby stabilizing the control.

Find Patent Forward Citations

Kobayashi, Koichiro. (2007). Magnetic flux measuring apparatus by hysteresis characteristic type digital fll using counter system for squid (U.S. Patent No. 7248044). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/7248044

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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