激光技术
激光技術
격광기술
Laser Technology
2015年
6期
769-775
,共7页
光学器件%离散角%干涉%光强%干涉效率%光学电压互感器
光學器件%離散角%榦涉%光彊%榦涉效率%光學電壓互感器
광학기건%리산각%간섭%광강%간섭효솔%광학전압호감기
optical devices%discrete angle%interference%light intensity%efficiency of interference%optical voltage trans-ducer
为了研究电场干扰对纵向调制结构光学电压互感器的影响，采用张量分析方法，从电光晶体相对逆介电张量入手，进行了仿真分析和实验验证，并根据光线分离实验结果，设计了光学电场传感器，传感器的幅值误差在±2％以内。结果表明，外界干扰电场会导致电光晶体内两传输简正模发生光线分离，使得两束偏振光在检偏器处不能进行有效干涉，进而使得有效输出信号变小；当干扰电压为500V、光斑半径达到0．2mm时，磷酸二氢钾晶体干涉效率引起的误差可以达到0．3％；而当干扰电场强度小于105 V／m时，锗酸铋晶体的干涉效率接近于1；干扰电场引起的互感器误差不仅与干扰电场大小有关，还与入射光束半径及传感晶体长度有关；选择具有较大光束半径的光源及减小传感晶体长度可以有效地降低干扰电场的影响。该研究成果将为光学电压互感器的设计提供一定的指导。
為瞭研究電場榦擾對縱嚮調製結構光學電壓互感器的影響，採用張量分析方法，從電光晶體相對逆介電張量入手，進行瞭倣真分析和實驗驗證，併根據光線分離實驗結果，設計瞭光學電場傳感器，傳感器的幅值誤差在±2％以內。結果錶明，外界榦擾電場會導緻電光晶體內兩傳輸簡正模髮生光線分離，使得兩束偏振光在檢偏器處不能進行有效榦涉，進而使得有效輸齣信號變小；噹榦擾電壓為500V、光斑半徑達到0．2mm時，燐痠二氫鉀晶體榦涉效率引起的誤差可以達到0．3％；而噹榦擾電場彊度小于105 V／m時，鍺痠鉍晶體的榦涉效率接近于1；榦擾電場引起的互感器誤差不僅與榦擾電場大小有關，還與入射光束半徑及傳感晶體長度有關；選擇具有較大光束半徑的光源及減小傳感晶體長度可以有效地降低榦擾電場的影響。該研究成果將為光學電壓互感器的設計提供一定的指導。
위료연구전장간우대종향조제결구광학전압호감기적영향，채용장량분석방법，종전광정체상대역개전장량입수，진행료방진분석화실험험증，병근거광선분리실험결과，설계료광학전장전감기，전감기적폭치오차재±2％이내。결과표명，외계간우전장회도치전광정체내량전수간정모발생광선분리，사득량속편진광재검편기처불능진행유효간섭，진이사득유효수출신호변소；당간우전압위500V、광반반경체도0．2mm시，린산이경갑정체간섭효솔인기적오차가이체도0．3％；이당간우전장강도소우105 V／m시，타산필정체적간섭효솔접근우1；간우전장인기적호감기오차불부여간우전장대소유관，환여입사광속반경급전감정체장도유관；선택구유교대광속반경적광원급감소전감정체장도가이유효지강저간우전장적영향。해연구성과장위광학전압호감기적설계제공일정적지도。
In order to investigate effect of electric field interference on the properties of an optical voltage transducer with longitudinal modulation structure , using tensor analysis method and based on the relative inverse dielectric tensor of the electro -optic crystal, simulation analysis and experimental verification were carried out .According to experimental result of light separation, an optical electric field sensor was designed .The magnitude error of sensor was within ±2%.The results show that light separation will occur in two transmitting normal modes of electro-optical crystal while electric field interference exists , which makes that the two polarized beams can not interfere effectively in the analyzer and which leads to a smaller output signal .The error caused by interference efficiency of KDP crystal can reached 0.3%when interference voltage was 500V and spot radius was 0.2mm.When interference field intensity is less than 105 V/m, interference efficiency of Bi 4 Ge3 O12 ( BGO) crystal is close to 1. The transducer error caused by electric field interference has the relationship not only with the magnitude of electric interference but also with the beam radius and the length of sensing crystal .The influence of interference electric field can be reduced effectively by selecting the light source with larger beam radius and the sensing crystal with smaller length .The research can provide the guidance for the design of optical voltage transducers .
