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:
Feb. 26, 2019
Filed:
Dec. 03, 2013
Hitachi, Ltd., Chiyoda-ku, Tokyo, JP;
Ryuzo Kawabata, Tokyo, JP;
Akihiko Kandori, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention addresses the problem of stabilizing signals in magnetic field measurement using optical pumping. In order to solve the problem, disclosed is a light source apparatus () that is characterized in having: a light intensity fluctuation detection circuit () that detects intensity fluctuation of light outputted from a laser output unit (); and an acousto-optic modulator () that corrects light intensity on the basis of light intensity fluctuation detected by means of the light intensity fluctuation detection circuit () such that the light intensity is constant Furthermore, a magnetic field measuring apparatus of the present invention is characterized in having: one sensor unit that passes therethrough light outputted from a light source unit: and a signal control processor that eliminates the light intensity fluctuation on the basis of two lights passed through the sensor unit.