Development of charging sensor using semiconductor with ultra-high resolution and charging analysis of spacecraft materials irradiated by proton

航天器总是暴露在等离子体和/或放射性射线中，如〓、〓和〓射线。当包裹航天器以保持温度稳定的绝缘材料受到放射性射线照射时，有时会发生由于静电放电而导致的意外事故。然而，辐照对材料电性能变化的影响尚不清楚。因此，由于卫星的发展需要卫星在轨表面材料的充电信息和充电现象，我们研制了卫星在高放射性射线电阻率轨道上的充电测量系统。本文采用脉冲电声（PEA）方法开发了一种用于充电测量传感器的新型半导体传感器。此外，我们还重点研究了使用小型PEA系统辐照的航天器用聚酰亚胺的内充电现象。

The spacecraft is always exposed to plasma and/or radioactive-rays such as 〓, 〓 and 〓-rays. When the insulating materials, in which the spacecraft is wrapped to keep temperature in it stable, are irradiated by the radioactive-rays, sometimes an unexpected accident due to an electrostatic discharge occurs. However, it has not known how the irradiation affects to change of the electrical properties of the materials. Therefore, as the satellite development needs the charging information and charging phenomena of surface materials of satellite on the orbit, we have developed the charging measurement system of it on the orbit with high radioactive-rays resistivity. In this paper, we started to develop new semiconductor sensor for charging measurement sensor using Pulsed electroacoustic (PEA) method. Furthermore, we also focused on an internal charging phenomenon on irradiated polyimide for spacecraft using small PEA system for irradiation using present polymer piezo sensor.