CONTAINER STAIN MONITORING DEVICE

摘要

PURPOSE:To provide a container stain monitoring device by which container stain can be monitored accurately by using an optical means without relying on an experience. CONSTITUTION:In a device to monitor stain on a wall surface of a container, the device has a light source 1 arranged outside of the container, a light transmissive material 12 arranged on the wall surface of the container so as to introduce light from the light source 1 to a mirror surface in the container and a dark field microscope 4 to receive the light passed through the light transmissive material 12 in the shape of scattered light from a foreign matter existing on the mirror surface.