Invention Grant
- Patent Title: Electric field sensor
- Patent Title (中): 电场传感器
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Application No.: US10527790Application Date: 2004-07-28
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Publication No.: US07859666B2Publication Date: 2010-12-28
- Inventor: Aiichirou Sasaki , Mitsuru Shinagawa , Nobutarou Shibata , Tadashi Minotani , Kazuo Fujiura , Masahiro Sasaura , Seiji Toyoda
- Applicant: Aiichirou Sasaki , Mitsuru Shinagawa , Nobutarou Shibata , Tadashi Minotani , Kazuo Fujiura , Masahiro Sasaura , Seiji Toyoda
- Applicant Address: JP
- Assignee: Nippon Telegraph and Telephone Corporation
- Current Assignee: Nippon Telegraph and Telephone Corporation
- Current Assignee Address: JP
- Agency: Kilpatrick Stockton LLP
- Priority: JP2003-281010 20030728; JP2003-380400 20031110; JP2003-380407 20031110; JP2003-380432 20031110; JP2004-100254 20040330; JP2004-113083 20040407
- International Application: PCT/JP2004/010716 WO 20040728
- International Announcement: WO2005/015247 WO 20050217
- Main IPC: G01R29/08
- IPC: G01R29/08 ; G01J4/04

Abstract:
The present invention relates to an electric field sensor including: a light source (1); an electro optic crystal (7) which is applied with an electric field based on a signal under test, in which a birefringent index changes according to the electric field, and which changes a polarization state of light incident from the light source according to the birefringent index and emits the light; and a detector (9, 17, 19, 21) that detects an electric signal according to the change of the polarization state of the light emitted from the electro optic crystal (7). Further, the electric field sensor includes: a signal electrode (11) for applying the electric field based on the signal under test to the electro optic crystal (7); a counter electrode (12) that forms a pair with the signal electrode (11); and an auxiliary electrode (61) that is electrically connected to the counter electrode (12), and that forms a capacitance with ground.
Public/Granted literature
- US20060152209A1 Electric field sensor and adjustment method thereof Public/Granted day:2006-07-13
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