| 高灵敏度测氡脉冲电离室前置放大器设计 |
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| 引用本文： | 黄叶,李福生,梁珺成,周倩倩,杨志杰,曾卫华,贺海江,张明,刘皓然. 高灵敏度测氡脉冲电离室前置放大器设计[J]. 计量学报, 2016, 0(Z1): 39-43. DOI: 10.3969/j.issn.1000-1158.2016.z1.09 |
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| 作者姓名： | 黄叶 李福生 梁珺成 周倩倩 杨志杰 曾卫华 贺海江 张明 刘皓然 |
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| 作者单位： | 1. 东华理工大学,江西南昌330013;中国计量科学研究院,北京100029;2. 东华理工大学,江西南昌,330013;3. 中国计量科学研究院,北京,100029;4. 中国地质大学,北京,100083 |
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| 摘 要： | 针对主流的商用测氡仪器在测量低浓度氡时精度低的问题,基于新型离子脉冲电离室输出信号特点,设计了一种基于集成运算放大器TL071的高灵敏前置放大电路.该前置放大器由电流电压转换、放大电路以及时间常数相同的CR-RC积分、微分滤波成形电路构成.使用Multisim10对其增益、幅频特性、失真度、信噪比以及输入阻抗等性能进行仿真与测试,结果表明:此前置放大器能将pA级的电流信号转换为电压信号并放大到V级,输入阻抗约为105 MΩ,电路失真度理论值可以达到O％,信噪比可达到100 dB.
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| 关 键 词： | 计量学 离子脉冲电离室 前置放大器 电流电压转换 积分微分电路 滤波成形 Multisim仿真 |
Design of Pre-amplifier for High Sensitivity Radon Pulse Ionization Chamber |
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| Abstract: | Aiming at the problem that the mainstream commercial radon instrument has low accuracy when measuring low radon concentration.For output signal of a new ion pulse ionization chamber,a highly sensitive preamplifier circuit based on integrated operational amplifier TL071 is designed.The preamplifier consists of current and voltage conversion circuit,amplifying circuit and CR-RC integral-differential filter forming circuit with the same time constant.Using Multisim 10 to its gain,amplitude-frequency characteristics,distortion,SNR and input impedance performance simulation and testing,the results show that the preamplifier converts the pA level signal into a voltage signal and amplifies it to V level,and the input impedance is about 105 MΩ.The distortion can reach 0％ and the SNR can reach 100 dB. |
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| Keywords: | metrology ion pulsed ionization chamber pre-amplifier current and voltage conversion integral-differential circuit filter forming Multisim emulation |
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