For fundamental discussions or understanding on contact/impact charging of particulate materials, it is essential to address measuring the charge generated due to a single impact or contact between a single particle and target- this is our basic concept at the study. Actually for that, we performed so-called “impact charging experiments,” in which a spherical plastic particle was launched one by one and made impact onto a metal target to measure the impact charge due to a single collision. To realize this, in our previous version of the experimets, the size of sample particles was limited to be big, the diameter of the particle used mainly was 3 mm. In this project, therefore, our major subject is to extend the concept into an actual powder size region. To realize the concept, we proposed two approaches in the direction of the enhancement: