| 铌酸锂晶体结构对电场传感器灵敏度影响分析 |
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| 引用本文： | 雷鸿毅,张家洪,张元英,王新宇,陈志炎.铌酸锂晶体结构对电场传感器灵敏度影响分析[J].红外与激光工程,2023,52(2):20220370-1-20220370-8. |
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| 作者姓名： | 雷鸿毅 张家洪 张元英 王新宇 陈志炎 |
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| 作者单位： | 1.昆明理工大学 信息工程与自动化学院，云南 昆明 650500 |
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| 基金项目： | 国家自然科学基金(62162034)；云南省基础研究计划面上项目(202201AT070189) |
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| 摘 要： | 铌酸锂晶体光学电场传感器为全介质结构，具有宽带宽、对被测电场干扰小的优点，但其灵敏度较低。因此，分析了晶体几何尺寸对传感器灵敏度的影响机理，得出通过增加沿外加电场方向的晶体尺寸同时减少晶体横截面上沿外加电场垂直方向的晶体尺寸来提高传感器的灵敏度。使用COMSOL仿真分析了铌酸锂晶体不同厚度、宽度、长度对晶体内部电场强度的影响，得出晶体厚度从15 mm减小到3 mm和宽度从3 mm增加到22 mm时，晶体内部电场强度分别提高约5.1倍和12.3倍；晶体长度从15 mm变化到55 mm时，晶体内部的电场强度变化仅约为5%。设计并研制出晶体尺寸分别为3 mm×3 mm×42.2 mm (x×y×z),3 mm×6 mm×42.2 mm (x×y×z),6 mm×6 mm×42.2 mm(x×y×z)的三只铌酸锂晶体电场传感器，并搭建工频电场测试平台，测试得出三只电场传感器的灵敏度分别为0.243 mV/(kV·m-1)、0.758 mV/(kV·m-1)、0.150 mV/(kV·m-1)。当晶体厚度和长度一定且晶体宽度从3 ...
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| 关 键 词： | 光学工程 电场传感器 晶体结构 铌酸锂晶体 灵敏度 |
| 收稿时间： | 2022-06-10 |
Analysis of influence of lithium niobate crystal structure on sensitivity of electric field sensors |
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| Affiliation: | 1.Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, China2.Yunnan Key Laboratory of Computer Technology Application, Kunming 650500, China |
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| Abstract: | The lithium niobate crystal optical electric field sensor has the advantages of wide bandwidth and negligible interference to the original electric field due to its all-dielectric structure. But it has low sensitivity to measure the electric field. The influence mechanism of crystal geometry size on sensor sensitivity is analyzed. The sensitivity of the sensor is improved by increasing the crystal size along the direction of the applied electric field and reducing the crystal size along the vertical direction of the applied electric field on the crystal cross-section. The influence of different thickness, width and length of the crystal on the internal electric field intensity has been analyzed using COMSOL simulation, and it is concluded that the internal electric field intensity of the crystal increases by about 5.1 times and 12.3 times when the thickness decreases from 15 mm to 3 mm and the width of the crystal increases from 3 mm to 22 mm, respectively. When the length of the crystal increases from 15 mm to 55 mm, the internal electric field intensity of the crystal changes by only about 5%. Three lithium niobate crystal electric field sensors with crystal sizes of 3 mm×3 mm×42.2 mm (x×y×z), 3 mm×6 mm×42.2 mm (x×y×z) and 6 mm×6 mm×42.2 mm (x×y×z) have been designed and developed, the sensitivities are 0.243 mV/(kV·m?1), 0.758 mV/(kV·m?1), 0.150 mV/(kV·m?1), respectively. When thickness and length of the crystal are constant, the sensor sensitivity is increased 3 times with the crystal width increased from 3 mm to 6 mm. When width and length of the crystal are constant, the sensor sensitivity is increased 5 times with the crystal thickness decreased from 6 mm to 3 mm. Combining the simulation and experimental results, it is concluded that a higher sensitivity electric field sensor can be developed by designing the crystal with wider width and thinner thickness under a certain crystal length. |
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