By arranging mirrors on both sides of the electro-optic crystal to form a Fabry-Perot cavity, the laser can travel back and forth multiple times inside the crystal, increasing the modulation depth of the laser phase in the crystal by the externally applied electric field, thus achieving high-sensitivity electric field measurement. A mathematical model of the transfer function for the Fabry-Perot type electro-optic crystal electric field sensor is established, and the response characteristics and their influencing factors of the sensor are calculated. The results show that the higher the reflectivity of the Fabry-Perot cavity is, the greater the improvement in measurement sensitivity will be, when the reflectivity is 0.99, the sensitivity can be increased by nearly a hundred times compared with the conventional interferometric sensing structure. The light absorption coefficient of the electro-optic crystal and the laser incident offset angle will affect the measurement sensitivity. The smaller the light absorption coefficient and the laser incident angle, the higher the measurement sensitivity.
參考文獻(xiàn)
[1] 史建軍，史永基，鄧帆，等. 生物細(xì)胞超短脈沖電場(chǎng)傳感器[J]. 傳感器世界，2008，14(2) ：10-16.
[2] 李昊，郭晨鋆，馬顯龍，等. 受潮對(duì)油浸式套管電熱場(chǎng)的影響[J] . 哈爾濱理工大學(xué)學(xué)報(bào)，2023，28(4) ：103-109.
[3] 張秋也，朱學(xué)成，高自偉，等. 溫度對(duì)油、紙介電參數(shù)及復(fù)合電場(chǎng)分布的影響[J] . 哈爾濱理工大學(xué)學(xué)報(bào)，2015，20(6) ：59-64.
[4] 張沛紅，單濤，時(shí)亞娟，等. 變壓器高壓套管均壓球區(qū)域電場(chǎng)分析及其結(jié)構(gòu)優(yōu)化[J] . 哈爾濱理工大學(xué)學(xué)報(bào)，2012，17(6) ：47-50.
[5] HIDAKA K.Electric field and voltage measurement by using electro-optic sensor[C]//1999 Eleventh International Symposium on High Voltage Engineering，1999 ：1-14.
[6] 李長(zhǎng)勝， 崔翔，李寶樹，等. 光纖電壓傳感器研究綜述[J]. 高電壓技術(shù)，2000，26(2) ：40-43.
[7] 李開成，張健梅，戴建華. 基于電光效應(yīng)的幾種光纖電壓傳感器[J]. 高壓電器，2001，37(1) ：41-43.
[8] HIDAKA K, KOUNO T.A method for measuring electric field in space charge by means of Pockels device[J].Journal of Electrostatics，1982，13(1) ：195-211.
[9] HIDAKA K, MUROOKA Y.Electric Field Measurements in Long Gap Discharge Using Pockels Device[J].IEE Proceedings A (Physical Science，Measurement and Instrumentation，Management and Education，Reviews)，1985，132(3) ：139-146.
[10] JOUANE Y, CHANG Y C, ZHANG D, et al.Unprecedented highest electro-optic coefficient of 226 pm/V for electro-optic polymer/TiO2 multilayer slot waveguide modulators[J].Optics Express，2014，22(22) ：27725-27732.
[11] GEIS W, SINTA R, MOWERS W, et al.Fabrication of crystalline organic waveguides with an exceptionally large electro-optic coefficient[J].Applied Physics Letters，2004，84(19) ：3729-3731.
[12] DUVILLARET L, RIALLAND S, COUTAZ J L.Electro-Optic Sensors for Electric Field Measurements.I.Theoretical Comparison Among Different Modulation Techniques[J].Journal of the Optical Society of America, B.Optical Physics，2002，19(11) ：2692-2703.
[13] LEE D J, WHITAKER J F.A simplified Fabry–Pérot electrooptic-modulation sensor[J].IEEE Photonics Technology Letters，2008，20(10) ：866-868.
[14] GABORIT G, MARTIN G, COUTAZ J L, et al.High-finesse Fabry-Perot electro-optic sensors with enhanced sensitivity and high spatial resolution[J].Applied Optics，2007，46(11) ：2001-2009.
[15] AMIN A, ANTOINE P, CORNET A, et al.Synchronized Fabry-Perot cavity used for enhanced sensitivity electro-optic measurements of electric fields in the microwave range[J].Applied Optics，2013，52(24) ：5894-5902.
[16] WANG Yongguang, WANG Guochen, GAO Weizhao, et al.Intense electric field optical sensor based on Fabry-Perot interferometer utilizing LiNbO3 crystal[J].Optics Express，2023，31(16) ：27054-27068.
[17] GARZARELLA A, WU D H.Optimal crystal geometry and orientation in electric field sensing using electro-optic sensors[J].Optics Letters，2012，37(11) ：2124-2126.
[18] PETRICEVIC S J, MIHAILOVIC P, RADUNOVIC J.A Miniature Pockels Cell with Novel Electrode Geometry[J].Sensors，2009，9(7) ：5298-5307
[19] 李海濤，葉妙元，崔瑛，等. 無(wú)源光纖脈沖電壓電場(chǎng)傳感器的研究[J]. 華中理工大學(xué)學(xué)報(bào)(自然科學(xué)版)，2000，28(9) ：38-39.
[20] WANG Zhuang, ZHANG Yibing, SONG Lijun, et al.Optical High DC Voltage Sensor Based on White-Light Interferometry[J].IEEE Photonics Technology Letters， 2006，18(19) ：2002-2004.
[21] ZHANG Chunxi, FENG Xiujuan, LIANG Sheng, et al.Quasi-reciprocal reflective optical voltage sensor based on Pockels effect with digital closed-loop detection technique[J].Optics Communications，2010，283(20) ：3878-3883.
[22] BOHNERT K, WILDERMUTH S, FRANK A, et al.Fiberoptic voltage sensor using fiber gyro technology[C]//Eurosensors Conference，2010 ：1091-1094.
[23] FUKUI Y, OKUMURA K, MORITAKE H, et al.A Typical Noiseless Pockels E Field Sensor[J].Review of Scientific Instruments，2010，81(11) ：114701.
[24] 尹曉薇. 基于電光材料的微型電場(chǎng)傳感器的研究[D] .廣州：暨南大學(xué)，2022.
[25] 雷鴻毅，張家洪，張?jiān)ⅲ? 鈮酸鋰晶體結(jié)構(gòu)對(duì)電場(chǎng)傳感器靈敏度影響分析[J] . 紅外與激光工程，2023，52(2) ：362-369.
