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首页> 外文会议>International symposium on photoelectronic detection and imaging;ISPDI 2011 >A high dynamic range current dosimeter for space ionization radiation measurement
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A high dynamic range current dosimeter for space ionization radiation measurement

机译：用于空间电离辐射测量的高动态范围电流剂量计

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摘要

A dosimeter for space ionization radiation field is developed, energy deposited in the sensitivity volume of ionization chamber induces an output current signal as weak as 10~(-14)A, and the dynamic range of the signal is very high. Now, an ionization chamber is designed and a variable gain current feedback preamp module is designed for the weak output current amplification is connected to output of the ionization chamber anode. The amplifier module includes Ⅰ-Ⅴ converter with T shaped resistance net, zero correct circuit, low pass filter, voltage linear amplifier circuit, gain control circuit and voltage output circuit. A complete analysis of this current preamp with respect to its circuit structure, dynamic properties, its equivalent input noise and the temperature effect is given. The effects of stray impedances on the behavior of the current feedback preamp are taken into account and the techniques necessary to achieve an optimum stable electrometer, with respect to noise, Dc drift, leakage currents, are applied. Experiments show that the energy of dosimeter deposited in the sensitivity volume of ionization chamber induces an output current signal as weak as 10~(-14)A, the current preamp can detect weak current effectively with the range from 100fA to 10μA through switchable gain.
机译：开发了一种用于空间电离辐射场的剂量计，沉积在电离室灵敏度容积中的能量产生了弱至10〜（-14）A的输出电流信号，并且信号的动态范围非常高。现在，设计了一个电离室，并设计了一个可变增益电流反馈前置放大器模块，用于将弱输出电流放大连接到电离室阳极的输出。放大器模块包括带有T形电阻网的Ⅰ-Ⅴ转换器，零校正电路，低通滤波器，电压线性放大器电路，增益控制电路和电压输出电路。对该电流前置放大器的电路结构，动态特性，等效输入噪声和温度影响进行了全面分析。考虑了杂散阻抗对电流反馈前置放大器性能的影响，并应用了针对噪声，Dc漂移，泄漏电流实现最佳稳定静电计所需的技术。实验表明，剂量计中的能量沉积在电离室的敏感容积中，会产生一个弱至10〜（-14）A的输出电流信号，电流前置放大器可以通过可切换的增益有效地检测100fA至10μA范围内的弱电流。

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