摘要: This report outlines techniques for monitoring the water vapor and particulate contamination in the vicinity of a spacecraft. The water vapor concentration is measured by first dissociating the water vapor with VUV radiation from ... 展开 This report outlines techniques for monitoring the water vapor and particulate contamination in the vicinity of a spacecraft. The water vapor concentration is measured by first dissociating the water vapor with VUV radiation from a krypton flashlamp and then monitoring the intensity of the chemiluminescence from the dissociation products. The particle properties are measured by illuminating particles in field of view of an imaging detector with visible radiation from a xenon flashlamp. The number of particles as well as the size and velocity distributions are obtained. This report also describes models developed to predict the water vapor and particulate contamination environments in the vicinity of spacecraft. The models take into account previous spaceborne contamination measurements. (TTL) 收起