New Research of Optical Voltage Transducer

The primary theory and design of a dual-mode interferometer all-fiber optical voltage transducer, which is used to measure the high voltage of power system. The transducer is based on the converse piezoelectric effect of quartz. The piezoelectric deformation of the cylinder-shaped transducer crystal induced by an applied ac voltage is sensed by an elliptical-core dual-mode fiber wound onto the circumferential surface. White-light interferometer and active homodyne phase tracking detect the resulting modulation of the differential phase between LP₀₁ mode and LP₁₁ mode in fiber. Based on the measure of signal phase, a new active homodyne phase tracking technology is proposed. An experiment is designed on to validate the feasibility of the high voltage transducer designed in this paper. Therefore, no optical elements, such as couplers, electro-optical crystal, and polarizer are used. In addition. So, the transducer is a system of simple, nicety, safety credibility, price low.