大气电场仪中相敏检波器的分析与设计

Analysis and Design of Phase Sensitive Detector in Atmospheric Electric Field Mill

针对大气电场探测中电场极性的鉴别问题,基于传统相敏检波理论,结合大气电场仪探头的结构特点,设计了一种由光电开关、四通道模拟开关和运放构成的相敏检波器。把该检波器应用于大气电场仪中,与低通滤波器结合能有效地鉴别被测电场极性。同时,分析了相敏检波器输入信号的同相问题,给出传感器的角度调整范围。通过在电场仪中的实际应用,说明了该检波器调试方便,性能稳定,灵敏度高。

In order to solve the problems of distinguishing polarity of the electric field in atmospheric electric field exploration, a new phase sensitive detector is designed, which ＂is composed of electro -optical switch, quad analog switch and amplifier. The new design is based on the traditional theory of phase sensitive detector, and combined with the structural characteristics＂ of the atmospheric electric field mill probe. Applying this phase sensitive detector to atmospheric electric field mill,the circuit can effectively distinguish the polarity of measured electric field combined with the low pass filter. Meanwhile,the problem of in- phase about phase sensitive detector input signals is analyzed and the angle adjustment range of sensor is presented. Through the practical application in the electric filed mill, it is proved that the phase sensitive detector has a series of advantages, such as convenient for debugging, stable on performance and high in sensitivity.