In Situ Study on PZT Modulator in Open-Loop FOG
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摘要: 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.
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关键词:
- 纤维光学陀螺仪 /
- 模型法 /
- 温度系数 /
- PZT光纤相位调制器
Abstract: The application characteristic of PZT fiber-optic phase modulator used in open-loop Fiber Optic Gyroscope (FOG) was analyzed theoretically. The open-loop FOG performance defection due to the variation of modulation coefficient and phase delay was studied. Two kinds of in situ measurement methods were designed, with which the temperature characteristic was tested and the temperature model was obtained with the least square polynomial fit method based on the data measured. The study shows that the open-loop FOG phase modulation coefficient KGP is linear with the temperature variation while the phase delay is quadratic in the experimental temperature range. -
1. Matthews A. Utilization of fiber optic gyros in inertial measurement units. Journal of the Institute of Navigation, 1990,37(1):17~38 2. Shigeru Oho, Hisao Sonobe, Takao Sasayama. Signal Processing Schemes for open-loop optical fiber gyroscopes. In:Udd. E. Fiber optic gyros: 15th anniversary conference. Boston: SPIE-The International Society for Optical Engineering, 1991, 1585:226~238 3. Lefever H. The Fiber-Optic Gyroscope. Boston·London: Artech Hourse, 1993, 270~271 4. 杨远洪,马 静,张惟叙．FOG中PZT调制器的建模．航空精密制造技术,1996, 32(1): 38~40 -
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