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.:
Date of Patent:
Sep. 27, 2005
Filed:
Jun. 09, 2003
Masahiro Murakami, Hitachinaka, JP;
Hitoshi Sasabuchi, Mito, JP;
Masahiro Murakami, Hitachinaka, JP;
Hitoshi Sasabuchi, Mito, JP;
Hitachi High-Technologies Corporation, Tokyo, JP;
Abstract
A biomagnetic measurement apparatus having functions to detect the release of a magnetic field lock in a SQUID fluxmeter operation circuit due to the influence of a much greater noise level than that of a biomagnetic signal, to notify an operator of the release of the magnetic field lock, and to automatically or manually revert to a state for allowing magnetic measurement. The release of the magnetic field lock occurs when an integrator of the fluxmeter operation circuit is saturated. Thus, a high pass filter is provided at a subsequent stage of the integrator, and a function is provided to judge that the integrator is in a saturated state when the noise level of the output after passing through the high pass filter is lower than a pre-set threshold. The biomagnetic measurement apparatus can detect a saturated state of the integrator, which is a cause for the release of the magnetic field lock of the SQUID fluxmeter operation circuit, and thereby when the loading of measured data is conducted in an appropriate operation range of a magnetic sensor, or even when a part of the loaded measured data is data outside an operation range of the magnetic sensor, it is possible to deal with the data so as to properly analyze it.