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:
Nov. 26, 2019
Filed:
Nov. 25, 2014
Hitachi, Ltd., Chiyoda-ku, Tokyo, JP;
Daichi Kawamura, Tokyo, JP;
Toru Masuda, Tokyo, JP;
Hiroshi Kageyama, Tokyo, JP;
Ayumu Hatanaka, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An acoustic emission wave detection system and an acoustic emission wave detector are provided. The acoustic emission wave detection system includes an acoustic emission wave detector, a photoelectric converter, and a determination processor. The acoustic emission wave detector includes a housing, an optical fiber that guides light from a wideband light source into the housing, and an FBG housed in the housing and having a diffractive grating that reflects light guided into the housing. The FBG is fixed on a side of the other end in the housing such that the light guided into the housing is received by one end thereof. An acoustic emission wave from a high-voltage apparatus is received by the other end thereof. Due to the insulation resistance of the FBG, the acoustic wave detector can be installed close to or in contact with the high-voltage apparatus without introducing discharges or noise from the high-voltage apparatus.