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一、引言为直接测量铁电陶瓷 BaTiO_3中高压光电效应,需要输入电阻 Ri>10~(15)欧、量程为±1千伏的静电计。市场出售的静电计无法同时满足这两项要求。具有场效应管输入的静电计的输入电阻 Ri≈10~(14)欧,最大量程为±200伏。振动电容静电计的输入电阻 R_i≈10~(16)欧,但电压量程却只有±30伏左右。
I. INTRODUCTION In order to directly measure the high voltage photoelectric effect of ferroelectric ceramic BaTiO_3, it is necessary to input the electrometer with resistance Ri> 10 ~ (15) Ω and range ± 1 kV. Electrostatics on the market can not satisfy both requirements. The input resistance of the electrometer with FET input Ri ≈ 10 ~ (14) Europe, the maximum range of ± 200 volts. Vibration capacitance electrometer’s input resistance R_i ≈ 10 ~ (16) Europe, but the voltage range is only ± 30 V or so.