白光干涉型法布里—珀罗光纤加速度计技术研究

发布时间：2018-04-24 11:57

  本文选题：光纤加速度计 + 法布里-珀罗干涉仪　； 参考：《中国航天科技集团公司第一研究院》2016年硕士论文

【摘要】：光纤加速度计是基于光学信号检测位移原理的新型加速度计,具有潜在精度高、动态范围大、高可靠、长寿命等特点。论文针对惯性仪表用光纤加速度计,研制了一种用于测量加速度直流信号的光纤加速度计。论文首先研究了光强调制型、波长调制型和相位调制型光纤加速度计方案的特点。对外腔式与内腔式光纤法布里-珀罗干涉仪进行了性能分析后,设计了基于外腔式法布里-珀罗干涉仪和光谱域白光干涉解调技术的光纤加速度计方案。论文分析了影响该光纤加速度计标度因数的结构参数,并利用有限元分析软件ANSYS进行静态仿真,确定了具体的参数。利用ADN8831热电冷却器控制芯片、ADN8810高精度电流芯片以及FPGA芯片设计了可调谐激光器驱动电路,并使用Quartus II软件和Verilog HDL编写了激光器驱动程序,利用labVIEW设计了上位机软件。论文研制了白光干涉型法布里-珀罗光纤加速度计原理样机,并进行了性能测试。测试结果表明:该光纤加速度计的标度因数稳定性达到1.7×10-4,零位稳定性为1.4×10-4g(1σ),量程为±25g,分辨率优于1.8×10-5g。最后,建立了影响该光纤加速度计测量精度的光学原理误差、交叉灵敏度误差以及环境温度引起的误差模型,并进行了仿真和实验分析。结果表明:随着信噪比的增加和光谱采样间隔的减小,光学原理的测量误差水平降低,测量精度可达到4.5×10-5g;在1倍重力加速度下交叉灵敏度误差为1.8mg;在-40~60℃的范围内该光纤加速度计的标度因数随温度的增加而增大,在低温段的增速大于高温段。
[Abstract]:Optical fiber accelerometer is a new accelerometer based on the principle of optical signal displacement detection, which has the characteristics of high potential precision, large dynamic range, high reliability and long life. In this paper, a fiber optic accelerometer for measuring DC acceleration signal is developed for inertial instrument. Firstly, the characteristics of optical fiber accelerometer based on light intensity modulation, wavelength modulation and phase modulation are studied. After performance analysis of external and intracavity fiber Fabry-Perot interferometers, an optical fiber accelerometer scheme based on external cavity Fabry-Perot interferometer and spectral domain white light interference demodulation technique is designed. The structural parameters which affect the scaling factor of the fiber-optic accelerometer are analyzed in this paper, and the specific parameters are determined by the static simulation of the finite element analysis software ANSYS. The tunable laser drive circuit is designed by using the ADN8831 thermoelectric cooler control chip (ADN8810) and the FPGA chip. The laser driver is programmed by Quartus II software and Verilog HDL, and the upper computer software is designed by labVIEW. The principle prototype of white light interferometric Fabry-Perot fiber accelerometer is developed and its performance is tested. The results show that the scaling factor stability of the fiber optic accelerometer is 1.7 脳 10 ~ (-4), the zero stability is 1.4 脳 10-4g(1 蟽 ~ (-1), the measuring range is 卤25 g, and the resolution is better than 1.8 脳 10 ~ (-5) g. Finally, the error models of optical principle error, cross sensitivity error and ambient temperature which affect the measurement accuracy of the fiber accelerometer are established, and the simulation and experimental analysis are carried out. The results show that the measurement error level of optical principle decreases with the increase of SNR and the decrease of spectral sampling interval. The precision of measurement is 4.5 脳 10 ~ (-5) g, the error of cross sensitivity is 1.8 mg at 1 times gravity acceleration, the scaling factor of the fiber optic accelerometer increases with the increase of temperature in the range of -40 ~ 60 鈩，

本文编号：1796524