Method and apparatus for detecting glass debris

摘要

The container (1) is typically a glass bottle which is orientated so that any glass debris is concentrated in as small an area as possible. A source of quasi-monochromatic light (17) such as a laser directs a beam through a polarising filter (19) to the area where any debris (15') may be expected. Light from the container (1) is received on a translucent screen (25). It then passes through polarising and interference filters (19,23) to a photoelectric detector such as a video camera (21). The output from the video camera is passed to an image processor (26) via an analogue to digital convertor and analysed according to variations in luminous intensity.