从光学电压传感器的原理出发，在周期性极化铌酸锂(PPLN)晶体倍频(SHG)效应基础上，提出了一种新的光学电压传感方法，讨论了周期性极化铌酸锂不同长度、不同占空比对该电压传感性能的影响，并给出了图示。结果表明：当周期性极化铌酸锂长度一定，在占空比为0.3或0.7时，灵敏度最高；在占空比趋于0.5，但不等于0.5时，电压测量范围最大；长度增加，灵敏度提高，但测量范围变小。这些结果为制作此类传感器提供了可靠的理论依据。

A novel method of optical voltage sensing based on second harmonic generation in periodically poled LiNbO3 (PPLN)is proposed. The influences of length and duty ratio of PPLN on the performance of optical voltage sensor are discussed. The simulated results show that when the length is fixed, the highest sensitivity can be obtained when the duty ratio is equal to 0.3 or 0.7; and voltage measurement range reaches maximum as the duty ratio approaches 0.5; the sensitivity increases and the sensing voltage measurement range decreases when the length of PPLN increases. These results provide another way to fabricate well-working optical voltage sensor.