Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1988-05-31
1991-02-26
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
324 77K, G01R 3100
Patent
active
049964755
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 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 electro-optic material. In order to accomplish precise detection of the voltage, a mirror in the form of a thin metal film or a multilayered dielectric film is disposed at the tip of electro-optic material and, at the same time, a transparent electrode is disposed on the side of electro-optic material opposite to the side where the mirror is disposed. As a result, lines of electric force produced by the voltage developing in the object are aligned in the electro-optic material parallel to the center line of the optical probe and the change in refractive index becomes uniform.
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Aoshima Shinichiro
Takahashi Hironori
Tsuchiya Yutaka
Eisenzopf Reinhard J.
Hamamatsu Photonics Kabushiki Kaisha
Urban Edward
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