CAJ | 학술논문

为了提高迈克尔逊干涉系统的抗干扰能力，取代传统的动镜扫描结构，设计了基于电光调制晶体折射率实现光程扫描的干涉系统。通过加载在可变折射率晶体上的调制电信号，使晶体折射率产生周期性变化，从而在原有系统光路中调制折射率改变光程差。通过理论计算获得了电光调制过程中系统可以产生的最大光程差，并仿真分析了晶体厚度及晶体衍射效率对调制过程的影响。经仿真分析可知，随着调制电压范围的增大，可获得的光程变化范围也增大，从而系统光谱分辨能力也相应增大。同时，在调制过程中设置调制范围使衍射损失的能量小于总能量的10％，从而保证较好信噪比。实验结果显示，随着调制电压的变化，干涉条纹产生周期性移动，但超过一定范围时会产生非线性误差。通过修正算法后系统光谱分辨率可达7.2 cm -1。在无抗震实验平台的条件下，传统干涉系统的相对误差超过20％，而本系统的相对误差低于3％，证明了系统采用静态电光调制后抗干扰能力显著增强。
위료제고매극이손간섭계통적항간우능력，취대전통적동경소묘결구，설계료기우전광조제정체절사솔실현광정소묘적간섭계통。통과가재재가변절사솔정체상적조제전신호，사정체절사솔산생주기성변화，종이재원유계통광로중조제절사솔개변광정차。통과이론계산획득료전광조제과정중계통가이산생적최대광정차，병방진분석료정체후도급정체연사효솔대조제과정적영향。경방진분석가지，수착조제전압범위적증대，가획득적광정변화범위야증대，종이계통광보분변능력야상응증대。동시，재조제과정중설치조제범위사연사손실적능량소우총능량적10％，종이보증교호신조비。실험결과현시，수착조제전압적변화，간섭조문산생주기성이동，단초과일정범위시회산생비선성오차。통과수정산법후계통광보분변솔가체7.2 cm -1。재무항진실험평태적조건하，전통간섭계통적상대오차초과20％，이본계통적상대오차저우3％，증명료계통채용정태전광조제후항간우능력현저증강。
In order to improve anti-jamming capability of Michelson interferometer system ,replace the traditional structure of the moving mirror scanning was replaced ,an interference system based on electro-optic modulation of crystal refractive index was de-signed to achieve optical path scanning .The system modulated voltage signal on the variable refractive crystal ,to generate cycli-cal changes ,changed the refractive index to control optical path difference in the original optical path system .Using electronic scanning to replace of mechanical scanning ,improved the system’s noise immunity was improved .In the electro-optic modulation process ,computed the maximum optical path difference of the system was computed ,and analyzed of the crystal thickness and crystal diffraction efficiency of the modulation process were analyzed .The simulation experiment shows that ,with the modula-tion voltage range increasing ,the available range of the optical path is also increased ,and the system spectrum resolving power will also increase accordingly .Meanwhile ,in the modulation process set the modulation range was set to make the energy of dif-fraction energy losses less than 10% of the total energy ,so as to ensure a better signal to noise ratio .Experimental results show that ,as the modulation voltage changes ,interference fringes occurred continuously moved .When the voltage is further in-creased ,the nonlinear error appears .After non-linear error correction for the system ,spectrum resolution reached to 7.2 cm -1 , slightly lower than the original system .But its anti-jamming capability is greatly enhanced ,as in the absence of experimental platform for seismic conditions ,conventional interferometer relative error is more than 20% ,while the relative error of the sys-tem is less than 5% ,in line with the design requirements .It was proved that the anti-jamming capability of the system was en-hanced greatly ,when the static electro-optical modulation was used .