高Q光纤环谐振腔陀螺角速度传感研究
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摘要
模拟仿真了谐振式光纤环腔的透射谱线以及鉴频曲线,得透射谱线最低谷值对应为调制谐振点,鉴频曲线的线性区为陀螺的工作范围区,线性区中点对应谐振点,可作为标度因数最大值.为了实现谐振点的高精度锁频和稳频,设计了谐振式光纤陀螺角速率测定方案,使用比例积分反馈电路实施锁频,利用正弦波扫描窄线宽激光器(线宽小于1kHz)的压电转化模块,使激光器谐振腔长发生变化,从而改变其输出频率,对谐振光纤环腔随外界环境变化同时进行跟踪和锁定.利用线宽法测试并计算出光纤环形谐振腔的品质因数值为107,对比分析了光纤环腔在谐振点和非谐振点锁定情况下的光电探测实时输出,并通过转动测试,得到两种情况下锁定后陀螺的连续转动效果.计算了光纤陀螺系统理论检测灵敏度,结果表明:谐振点锁定后转动效果对应的陀螺输出电平值为锁定非谐振点转速电平值的3倍,验证了谐振式光学陀螺谐振点锁频的重要性.
The transmission spectrum and demodulation curve of the fiber ring resonator were simulated.As can be seen,the lowest value of transmission spectrum was corresponding to the modulation resonance point,the linear zone of demodulation curve was the dynamic range of gyroscope,the midpoint of the linear region was corresponds to the resonance point and it could be used as the maximum of scale factor.In order to achieve the high accuracy and steady frequency locked of the resonance point,resonant gyroscope angular velocity measurement scheme was designed,which used proportional integral circuit to lock the resonant frequency and sine wave to scan the piezoelectric transducer of narrow linewidth laser(linewidth is less than 1kHz),so that the length of laser resonant cavity was changed to adapt the changes of the fiber ring resonator which real-time tracked and locked with the external environment.Through the method of linewidth,calculated quickly that the quality value of fiber ring resonator was 107.The real-time output of the fiber ring cavity in resonant and non-resonant points frequency locked were compared and analyzed,the continuous rotation in the two kinds condition was obtained by rotation test.The detection sensitivity of fiber optic gyro system in the theory was calculated finally.The results show that the output level of the gyro value in the resonant point is 3times than the non-resonant point,which proves the importance of the resonator fiber optic gyroscope resonant frequency locking.
The transmission spectrum and demodulation curve of the fiber ring resonator were simulated.As can be seen,the lowest value of transmission spectrum was corresponding to the modulation resonance point,the linear zone of demodulation curve was the dynamic range of gyroscope,the midpoint of the linear region was corresponds to the resonance point and it could be used as the maximum of scale factor.In order to achieve the high accuracy and steady frequency locked of the resonance point,resonant gyroscope angular velocity measurement scheme was designed,which used proportional integral circuit to lock the resonant frequency and sine wave to scan the piezoelectric transducer of narrow linewidth laser(linewidth is less than 1kHz),so that the length of laser resonant cavity was changed to adapt the changes of the fiber ring resonator which real-time tracked and locked with the external environment.Through the method of linewidth,calculated quickly that the quality value of fiber ring resonator was 107.The real-time output of the fiber ring cavity in resonant and non-resonant points frequency locked were compared and analyzed,the continuous rotation in the two kinds condition was obtained by rotation test.The detection sensitivity of fiber optic gyro system in the theory was calculated finally.The results show that the output level of the gyro value in the resonant point is 3times than the non-resonant point,which proves the importance of the resonator fiber optic gyroscope resonant frequency locking.
引文
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[21]CIMINELLI C,DELL′OLIO F,CAMPANELLA C E,et al.Photonic technologies for angular velocity sensing[J].Advances in Optics and Photonics.2010,2(3):370-404.
[22]FRANCESCO D,CATERINA C.Theretical invesgation of indium phosphide buried ring resonators for new angular velocity sensors[J].Optical Engineering,2013,52(2):1-7.
[2]王巍.干涉型光纤陀螺仪技术[M].北京:中国宇航出版社,2010.
[3]GUSTAVSON T L,LANDRAGIN A,KASEVICH M A.Rotation sensing with a dual atom-interferometer Sagnac gyroscope[J].Classical and Quantum Gravity,2000,17(12):2385-2398.
[4]EZEKIEL S,BALSAMOL S R.Passive ring resonator laser gyroscope[J].Applied Physics Letters,1977,30(9):478-480.
[5]MEYER R E,EZEKIEL S.Passive fiber optic ring resonator for rotation sensing[J].Optics Letters,1983,8(12):644-646.
[6]SANDERS G A,ROUSE G F,STRANDJORD L K,et al.Resonator fiber optic gyro using LiNbO3integrated optics at1.5μm wavelength[C].SPIE,1988,985:202-210.
[7]HOTATE K,TAKIGUCHI K,HIROSE A.Adjustment free method to eliminate the noise induced by the back scattering in an optical passive ring resonator gyro[J].Photonics Technology Letters,1990,2(l):75-77.
[8]HOTATE K,HARUMOTO M.Resonator fiber optic gyro using digital serrodyne modulation[J].Journal of Lightwave Technology,1997,15(3):466-473.
[9]彭博.基于FPGA的谐振式光纤陀螺数字系统设计和实现[D].杭州:浙江大学,2010:1-6.
[10]杨志怀.谐振式光纤陀螺光学噪声分析与信号检测技术研究[D].杭州:浙江大学,2010:1-9.
[11]TANG Quan-an,MA Xin-yu.Experimental study on fiber ring resonator in resonator fiber optic gyroscope[J].Infrared and Laser Engineering,1998,27(4):33-36.汤全安,马新宇.谐振式光纤陀螺中环形谐振腔的实验研究[J].红外与激光工程,1998,27(4):33-36.
[12]XU Peng-fei,ZHANG Jian-hui,MENG Xiang-ran,et al.Characteristics of fiber ring resonator dynamic response[J].Infrared and Laser Engineering,2013,42(3):599-604.徐鹏飞,张建辉,孟祥然,等.光纤腔动态谐振响应特性[J].红外与激光工程,2013,42(3):599-604.
[13]YAO Qiong,SONG Zhang-qi,XIE Yuan-ping,et al.Study on the characteristics of fiber optic resonator ring for resonator fiber optic gyroscope[J].Acta Photonica Sinica,2007,36(4):676-680.姚琼,宋章启,谢元平,等.谐振腔光纤陀螺光纤谐振环特性研究[J].光子学报,2007,36(4):676-680.
[14]WANG K,FENG L,WANG J,et al.Alternative method for design and optimization of the ring resonator used in microoptic gyro[J].Applied Optics,2013,52(7):1481-1486.
[15]HONG L,ZHANG C,FENG L,et al.Frequency tracking and locking method used in resonator micro-optic gyro[J].Sensor Letters,2012,10(1-2):14-17.
[16]SWAIM J D,KNITTEL J,BOWEN W P.Detection of nanoparticles with a frequency locked whispering gallery mode micro-resonator[J].Applied Physics Letters,2013,102(18):183106.
[17]HONG Ling-fei,ZHANG Chun-xi,FENG Li-shuang,et al.Frequency tracking and locking methods in resonator mircooptic gyro[J].Chinese Journal of Laser,2011,38(9):103-107.洪灵菲,张春熹,冯丽爽,等.谐振式微光学陀螺频率跟踪与锁定技术研究[J].中国激光,2011,38(9):103-107.
[18]YING D Q,MA H L,JIN Z G.Dynamic characteristics of RFOG based on the triangle wave phase modulation technique[J].Optics Communications.2008,281(21):5340-5343.
[19]LI Jian,WU Ling-an.Phase modulation locked optical resonator[J].Acta Optica Sinica,1995,15(12):1641-1645.李健,吴令安.相位调制锁定光学谐振腔[J].光学学报,1995,15(12):1641-1645.
[20]YAO Qiong,HU Yong-ming,XIE Yuan-ping,et al.Study on the influence of phase reset error on resonator fiber optic gyroscope[J].Acta Photonica Sinica,2007,36(5):851-855.姚琼,胡永明,谢元平,等.谐振腔光纤陀螺相位调制复位误差影响的研究[J].光子学报,2007,36(5):851-855.
[21]CIMINELLI C,DELL′OLIO F,CAMPANELLA C E,et al.Photonic technologies for angular velocity sensing[J].Advances in Optics and Photonics.2010,2(3):370-404.
[22]FRANCESCO D,CATERINA C.Theretical invesgation of indium phosphide buried ring resonators for new angular velocity sensors[J].Optical Engineering,2013,52(2):1-7.