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从理论上分析了ＰＺＴ（ 压电型） 光纤相位调制器在开环ＦＯＧ（ 光纤陀螺）中的应用特点，研究了它的调制系数和调制相位延迟变化对开环ＦＯＧ 性能的影响；并设计了两种独立的在线测试方法对它们进行了温度特性研究，利用所得数据，用最小二乘多项式拟合的方法分别得到了它们的温度模型．研究表明，在实验温度范围内，开环ＦＯＧ 的相位调制系数ＫＧＰ随温度呈线性变化，而调制相位延迟α随温度呈二次的变化．
The application characteristics of PZT (piezoelectric) fiber phase modulator in open-loop FOG (fiber optic gyroscope) are analyzed in theory. The influence of its modulation factor and modulation phase delay on the performance of open-loop FOG is studied. Two independent on-line test methods were used to study their temperature characteristics. Using the obtained data, their temperature models were obtained by using least squares polynomial fitting. The results show that the phase modulation coefficient KGP of the open-loop FOG changes linearly with temperature and the phase delay α of the modulation changes quadratically with temperature within the experimental temperature range.