| 摘要 |
<p>The installation which allows to control particularly large bottles comprises, as in conventional installations, a row (20) of phototransistors (22), but it uses, as light source, a laser (10), of which the ray (12) is spread by means of a cylindrical convex surface (14) forming a plane light beam (16); in front of the row of phototransistors (20) there is arranged a lens which projects the shape of any impurity of the content on at least one of the phototransistors (22).</p> |
