Method and apparatus for inspecting extraneous solid substances contained in liquid

摘要

An improved method for inspection of extraneous substances which may exist in a transparent liquid filled in a transparent container such as an ampoule which comprises rotating the container, projecting light through the liquid in the container, measuring the intensity of light beams passed through the container, and determining the extent of interception of light due to the presence of the substances. The invention is characterized by providing two rotating scan heads on an optical fiber line-circle converter and connecting two photoelectrical elements to the heads. This achieves, with the conventional speed, essentially the same effect as that obtained by doubling the rotating speed of the scan heads.