Spatiotemporally resolved measurements of electric field around a piezoelectric transformer using electric-field induced second harmonic (E-FISH) generation
Spatiotemporally resolved measurements of electric field around a piezoelectric transformer using electric-field induced second harmonic (E-FISH) generation
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DOI：
10.1088/1361-6463/ac406a
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发表时间：
2021-12
期刊：
影响因子：
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通讯作者：
Jinyu Yang;E. Barnat;S. Im;D. Go
中科院分区：
文献类型：
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作者：
Jinyu Yang;E. Barnat;S. Im;D. Go
当压电Transformer（PT）通过低输入电压以其二次谐波频率致动时，在远端处产生的电场可足以击穿周围气体，使其成为用于非平衡等离子体产生的有吸引力的电源。了解PT在周围介质中产生的电势和电场对于有效地设计和使用PT等离子体装置是重要的。在这项工作中，时空分辨的特性所产生的电场PT在露天工作已被调查使用飞秒电场诱导的二次谐波产生（E-FISH）的方法。电场分量通过同时进行E-FISH测量来确定，其中入射激光在相对于PT晶体的两个正交方向上偏振。这项工作的结果表明周围的PT的输出远端的电场的空间分布，以及它如何演变为时间的函数。值得注意的是，最强的电场出现在PT远端表面的表面上，靠近顶部和底部边缘，并且在3 mm内下降约70%。PT的输入电压和测量电场之间的时间延迟表明存在约0.45 π之间的相位差PT的输入电压和输出信号。
When a piezoelectric transformer (PT) is actuated at its second harmonic frequency by a low input voltage, the generated electric field at the distal end can be sufficient to breakdown the surrounding gas, making them attractive power sources for non-equilibrium plasma generation. Understanding the potential and electric field produced in the surrounding medium by the PT is important for effectively designing and using PT plasma devices. In this work, the spatiotemporally resolved characteristics of the electric field generated by a PT operating in open air have been investigated using the femtosecond electric field-induced second harmonic generation (E-FISH) method. Electric field components were determined by simultaneously conducting E-FISH measurements with the incident laser polarized in two orthogonal directions relative to the PT crystal. Results of this work demonstrate the spatial distribution of electric field around the PT’s output distal end and how it evolves as a function of time. Notably, the strongest electric field appears on the face of the PT’s distal surface, near the top and bottom edges and decreases by approximately 70% over 3 mm. The time delay between the PT’s input voltage and measured electric field indicates that there is an about 0.45π phase difference between the PT’s input voltage and output signal.