Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1988-05-31
1989-09-12
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
350356, 356368, G01R 3100, G01R 2912
Patent
active
048663727
ABSTRACT:
A voltage detector detects a voltage developing in a selected area of an object such as an integrated circuit by utilizing an electro-optic material equipped in an optical probe. A change in refractive index of the first electro-optic material which is caused by the voltage in the object, is detected as a change of polarization of a light beam passing through the first electro-optic material. In order to compensating for a polarization change caused by the spontaneous birefringence, the first and second electro-optic materials made of the same material are disposed in such a manner that the first and second electro-optic materials and aligned along a light-traveling direction with their lengths in the light-traveling direction being substantially identical and with their optic axes being perpendicular to each other.
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Aoshima Shinichiro
Takahashi Hironori
Tsuchiya Yutaka
Hamamatsu Photonics Kabushiki Kaisha
Karlsen Ernest F.
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