Optics: measuring and testing – By polarized light examination – With polariscopes
Reexamination Certificate
2004-07-28
2010-12-28
Toatley, Gregory J (Department: 2877)
Optics: measuring and testing
By polarized light examination
With polariscopes
C250S227140, C324S754120
Reexamination Certificate
active
07859666
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.
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Cecelja et al. “Electro-Optic Sensor for Measurement of DC Fields in the Presence of Space Charge”, IEEE Transactions on Instrumentation and Measurement, IEEE Service Center, vol. 61, No. 2, Apr. 2002.
Fujiura Kazuo
Minotani Tadashi
Sasaki Aiichirou
Sasaura Masahiro
Shibata Nobutarou
Kilpatrick & Stockton LLP
Nippon Telegraph and Telephone Corporation
Slomski Rebecca C
Toatley Gregory J
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