| 摘要 |
In an optical voltage sensor which comprises a sensor part having a polarizer 1, a crystal lambd/4 plate 2, a LiNbO3 crystal 3, and an analyzer 4, a light emission part 10 emitting a light beam to the sensor part through an optical fiber, and a light reception part 12 for receiving the light beam having passed the sensor part through another optical fiber, the optical fiber used therein is a type having a core diameter allowing the beam to satisfy a range of 0.8 to 1.4° for a beam edge angle of the beam on the LiNbO3 crystal. Alternatively, another type of optical fiber may be used in the light reception part 12, having a core diameter or NA which allows the light reception part 12 to selectively receive only partial beams satisfying the range of 0.8 to 1.4° for the beam edge angle of the beam on the LiNbO3 crystal. With such structure, the optical voltage sensor can have improved temperature dependence and can be manufactured with ease and low cost.
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