A High Sensitivity Electric Field Microsensor Based on Torsional Resonance

被引:35
作者
Chu, Zhaozhi [1 ,2 ]
Peng, Chunrong [1 ]
Ren, Ren [1 ]
Ling, Biyun [1 ,2 ]
Zhang, Zhouwei [1 ,2 ]
Lei, Hucheng [1 ,2 ]
Xia, Shanhong [1 ]
机构
[1] Chinese Acad Sci, Inst Elect, State Key Lab Transducer Technol, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China
来源
SENSORS | 2018年 / 18卷 / 01期
基金
国家高技术研究发展计划(863计划); 中国国家自然科学基金;
关键词
electric field microsensor; torsional resonance; MEMS; efficiency of charge induction; ELECTROSTATIC CHARGE;
D O I
10.3390/s18010286
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
This paper proposes a high sensitivity electric field microsensor (EFM) based on torsional resonance. The proposed microsensor adopts torsional shutter, which is composed of shielding electrodes and torsional beams. The movable shielding electrodes and the fixed sensing electrodes are fabricated on the same plane and interdigitally arranged. Push-pull electrostatic actuation method is employed to excite the torsional shutter. Simulation results proved that the torsional shutter has higher efficiency of charge induction. The optimization of structure parameters was conducted to improve its efficiency of charge induction further. A micromachining fabrication process was developed to fabricate the EFM. Experiments were conducted to characterize the EFM. A good linearity of 0.15% was achieved within an electrostatic field range of 0-50 kV/m, and the uncertainty was below 0.38% in the three roundtrip measurements. A high sensitivity of 4.82 mV/(kV/m) was achieved with the trans-resistance of 100 M Omega, which is improved by at least one order of magnitude compared with previously reported EFMs. The efficiency of charge induction for this microsensor reached 48.19 pA/(kV/m).
引用
收藏
页数:16
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