| 摘要 |
<p>A voltage sensor utilizing a non-reciprocal phase shift induced by a time variation of an electric field of the voltage to be measured. A light source provides broadband light to a polarizer. The polarized light is distributed to two linear polarizations. The two polarizations of light are provided with a dynamic or static phase shift relative to each other before or after being birefringently modulated with an electro-optic sensor in accordance with the electric field of a voltage to be measured. The modulated light goes through a delay line that is terminated with a quarter-wave plate and mirror. The quarter-wave plate may be an optical fiber. The portion of light entering the quarter-wave device in a first polarization is reflected in a second polarization and the portion of light entering the quarter-wave device in the second polarization is reflected in the first polarization. The electro-optic sensor again birefringently modulates the light. The light is converted to electrical signals that are processed into a signal representing a non-reciprocal phase shift that is proportional to the sensed electric field. The latter signal is integrated into a signal proportional to the electric field of the voltage to be measured.</p> |
