CAJ | 학술논문

为了实现AC(工频)和DC电场同时检测，该文基于MEMS电场传感器，采用直接数字频率合成器(DDS)激励及正交锁相技术研制出一种高性能微型电场传感器电路。该系统结合低噪声模拟电路和数字控制方式，采用DDS 产生精准的传感器激励信号和双路正交参考信号，保证了激励信号及正交参考信号的频率、幅值稳定性以及双路正交参考信号之间准确的相位差。采用相关解调芯片及高速滤波器构建正交锁相放大电路，结合 Advanced RISC Machines (ARM)微控制器，解决了单片机数字信号处理响应速度慢、资源不足等问题，成功实现AC(工频)及DC电场加载情况下传感器弱信号高精度提取。
위료실현AC(공빈)화DC전장동시검측，해문기우MEMS전장전감기，채용직접수자빈솔합성기(DDS)격려급정교쇄상기술연제출일충고성능미형전장전감기전로。해계통결합저조성모의전로화수자공제방식，채용DDS 산생정준적전감기격려신호화쌍로정교삼고신호，보증료격려신호급정교삼고신호적빈솔、폭치은정성이급쌍로정교삼고신호지간준학적상위차。채용상관해조심편급고속려파기구건정교쇄상방대전로，결합 Advanced RISC Machines (ARM)미공제기，해결료단편궤수자신호처리향응속도만、자원불족등문제，성공실현AC(공빈)급DC전장가재정황하전감기약신호고정도제취。
A novel and high-performance micromachined electric-field sensor system circuit which can measure both AC (50 Hz) and DC fields is presented based on Direct Digital Synthesizer (DDS) and Lock-In-Amplifier (LIA). The system combines low-noise analog circuits and digital control scheme, using DDS to generate the excitation signal and the orthogonal reference signals, ensures the frequency and amplitude stability of the excitation signal and precise phase difference between the orthogonal reference signals. Using demodulator chip and high-speed filter to build quadrature lock-in amplifier circuit, combining with the ARM microcontroller, the system achieves a faster response and saves much more sources than the simple digital processing circuit.