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磁场电流稳定器

席德明 梅镇岳

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Citation:

磁场电流稳定器

席德明, 梅镇岳

A CURRENT STABLIZER FOR β-RAY SPECTROMETER

HSI TEH-MING, MEI JBNN-YUEH
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  • 论文中所叙述的磁场电流稳定器是β谱仪的一部分。基本上它也能应用在其他需要稳定电流的仪器上。它能控制的电流最大可到100安。稳定的程度是在10分钟内电流的变动不超过0.02%。稳定器采用负反馈伺服控制原理。首先将通过标准电阻的直流电流的误差讯号加以放大。为了避免直流电压放大器的漂移效应,我们桥式式平衡调制器将直流讯号变成交变讯号后再用交流放大,然后用相灵敏解调器恢复直流讯号。在这一过程中需要的增益大约是2×104,我们要考虑到调制器输出点在没有讯号输入时零电位的保持,调制器的载波成分输出问题,和经过放大后调制输出讯号的波形畸变。我们把放大后的讯号再加以功率放大来控制直流发电机的激励磁场,这样就能达到稳定电流的目的。因为在系统中存在着电容和电感,讯号在系统中傅递时就有时间延迟,在闭环系统就会产生低频振荡的不稳定现象。所以在系统中安装抵消这种振荡的镇定网络也是一种必要的措施。论文的最后部分描述稳定器的部件,具体的安排,运转结果和性能。
    The current stablizer, reported in this paper, is part of a β-ray spectrometer. Principally, it can also be used in other apparatus requiring stablized current. The stablizer can supply a maximum current of 100 A with a degree of stablity of 0.02% in ten minutes.We adopt the principle of negative feed back sevo-control in designing the stablizer. Firstly, the error signal of the DC current passing through a standard resistance is amplified. In order to avoid the drift effect of the usual DC amplifier, we use a bridge type balanced modulator to convert DC signal into AC signal. After AC amplification, the signal is demodulated by a phase sensitive demodulator. The amplification required is about 2×l04. Concerning the amplifier, the following problems are considered in detail: to keep the output of the modulator in zero potential while there is no input signal, the effect of the carrier component of the modulator, and the distortion of the modulated signal after amplification. After power amplification, the amplified signal is used to control the field supply of the DC generator. As there are capacitance and inductance in the system, the transmission of the signal in the system has time delay. In closed system, there is the possibility of instability of the nature of low frequency oscillation, and it is necessary to insert proper network in the system to suppress the oscillation. Finally, the detailed arrangements of the different components of the stablizer, its characteristics, and result of its operation are described.
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  • 文章访问数:  7485
  • PDF下载量:  452
  • 被引次数: 0
出版历程
  • 收稿日期:  1957-11-02
  • 刊出日期:  1958-02-05

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