本文選題：光纖加速度計 + 法布里-珀羅干涉儀　； 參考：《中國航天科技集團公司第一研究院》2016年碩士論文

【摘要】：光纖加速度計是基于光學信號檢測位移原理的新型加速度計,具有潛在精度高、動態(tài)范圍大、高可靠、長壽命等特點。論文針對慣性儀表用光纖加速度計,研制了一種用于測量加速度直流信號的光纖加速度計。論文首先研究了光強調(diào)制型、波長調(diào)制型和相位調(diào)制型光纖加速度計方案的特點。對外腔式與內(nèi)腔式光纖法布里-珀羅干涉儀進行了性能分析后,設(shè)計了基于外腔式法布里-珀羅干涉儀和光譜域白光干涉解調(diào)技術(shù)的光纖加速度計方案。論文分析了影響該光纖加速度計標度因數(shù)的結(jié)構(gòu)參數(shù),并利用有限元分析軟件ANSYS進行靜態(tài)仿真,確定了具體的參數(shù)。利用ADN8831熱電冷卻器控制芯片、ADN8810高精度電流芯片以及FPGA芯片設(shè)計了可調(diào)諧激光器驅(qū)動電路,并使用Quartus II軟件和Verilog HDL編寫了激光器驅(qū)動程序,利用labVIEW設(shè)計了上位機軟件。論文研制了白光干涉型法布里-珀羅光纖加速度計原理樣機,并進行了性能測試。測試結(jié)果表明:該光纖加速度計的標度因數(shù)穩(wěn)定性達到1.7×10-4,零位穩(wěn)定性為1.4×10-4g(1σ),量程為±25g,分辨率優(yōu)于1.8×10-5g。最后,建立了影響該光纖加速度計測量精度的光學原理誤差、交叉靈敏度誤差以及環(huán)境溫度引起的誤差模型,并進行了仿真和實驗分析。結(jié)果表明:隨著信噪比的增加和光譜采樣間隔的減小,光學原理的測量誤差水平降低,測量精度可達到4.5×10-5g;在1倍重力加速度下交叉靈敏度誤差為1.8mg;在-40~60℃的范圍內(nèi)該光纖加速度計的標度因數(shù)隨溫度的增加而增大,在低溫段的增速大于高溫段。
[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 鹵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，

本文編號：1796524