测量等离子体中尘埃颗粒电荷量的实验方法

Experiment methods of measuring the charge of dust particles in a dusty plasma

综述了国内外测量尘埃等离子体中尘埃颗粒所带平衡电荷量的实验方法。在文章的前一部分,重点介绍了几种间接测量方法,在文章的后一部分,给出了我们初步的实验结果。实验中,我们根据尘埃颗粒在鞘层中平衡位置处所受重力和电场力平衡mdg=QdE(Z0),从而求出尘埃颗粒所带的平衡电荷量为102e～105e,这一结果与其他研究者的结果符合得很好。

This paper introduces some methods of measuring the grain equilibrium charge on individual dust grain in a dusty plasma. In the fore part of the paper, some indirect measurements are mainly introduced. In the back part of the paper, our experimental result is given. In our experiment dust particles is levitated in the sheath where the electrostatic force is strong enough to compensate for the weight of the particles according to m_dg=Q_dE(Z_0), we can attain the dust grain equilibrium charge. The charge is found to be 10~2e～10~5e. The result is ultimately consistent with other reseachers'resnlt.