发明授权
- 专利标题: Current measuring device
- 专利标题(中): 电流测量装置
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申请号: US10502277申请日: 2003-02-28
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公开(公告)号: US07176671B2公开(公告)日: 2007-02-13
- 发明人: Kiyoshi Kurosawa , Yoshiharu Hiroki , Yoshihiro Konno , Masaru Sasaki
- 申请人: Kiyoshi Kurosawa , Yoshiharu Hiroki , Yoshihiro Konno , Masaru Sasaki
- 申请人地址: JP Tokyo JP Tokyo
- 专利权人: The Tokoyo Electric Power Company, Inc,Namiki Precision Jewel Co., Ltd.
- 当前专利权人: The Tokoyo Electric Power Company, Inc,Namiki Precision Jewel Co., Ltd.
- 当前专利权人地址: JP Tokyo JP Tokyo
- 代理机构: Harness, Dickey & Pierce, P.L.C.
- 优先权: JP2002-055231 20020301
- 国际申请: PCT/JP03/02344 WO 20030228
- 国际公布: WO03/075018 WO 20030912
- 主分类号: G01R31/00
- IPC分类号: G01R31/00 ; G01J4/00
摘要:
A current measuring apparatus comprises a current detection unit 10 and a photoelectric converter 20. The current detection unit 10 comprises an optical fiber sensor 11 extended or looped around a conductor 30. A reflective film 12 is attached to one end of the sensor 11 so that light can be reflected by the end of the sensor. The current detection unit 10 further comprises a first Faraday element 13, a light-transmitting birefringent member 14, a first optical fiber 15, a second optical fiber 16 and a lens 17. The Faraday element 13 rotates a plane of polarization of the incident light through about 22.5°. The birefringent member 14 functions to separate the light emitted from the sensor 11 into an ordinary ray L1 and an extraordinary ray L2 that are orthogonal to each other, and to transmit linearly polarized light L0 emitted from a light source. The lens 17 is provided between the element 13 and the birefringent member 14. Focal points of the lens are formed at core portions of an input end 11a of the sensor 11 and an end face 15a of the first optical fiber 15. With this arrangement, the number of components is reduced and the apparatus is reduced in size.
公开/授权文献
- US20050083033A1 Current measuring device 公开/授权日:2005-04-21