A new micro-power atmospheric electric field sensor is developed to tackle issues present in the current rotating ground electric field instrument,such as high energy consumption,weak signals,and susceptibility to electromagnetic interference.The sensor replicates the mechanical rotational arrangement of typical sensors.An electronic switch is triggered,leading to diminished energy usage and a prolonged duration of uninterrupted battery power for the instrument.The current signals are converted to voltage signals by the I/V converter,followed by differentiation of the output signals to eliminate industrial frequency interference and common mode effects.The signal-to-noise ratio is further enhanced by filtering with a fourth-order band-pass filter.Finally,the DC voltage,which is proportional to the electric field's strength,is obtained using a phase-sensitive detector.After conducting 16-bit ADC sampling,measurements are obtained for atmospheric field strength.The test confirms that the system is capable of measuring up to 10 V/m within the range of-50～50 kV/m field strength,with a measurement linearity of<1%.
关键词
大气电场仪/微功耗/传感器/屏蔽
Key words
atmospheric electric field instrument/micro-power/sensor/shielding
维普
万方数据