| 摘要 |
<p>1. An apparatus for the supervision of a fluid in flow for the detection of an absorbent body carried along by this fluid in flow, in which a source (1) emitting radiation is located between two cylindrical tubings (2, 3) through one (3) of which passes the fluid under supervision and through the other of which, hereinafter called the reference tubing (2), passes a reference fluid, and cells (4, 5) detective of this radiation are arranged respectively behind each tubing (2, 3), characterized in that the two tubings (2, 3) are each spaced at a distance from the emitting source (1) to give rise to an effect of focusing of the said radiation by the said tubings and each detective cell (4, 5) is arranged in the focal zone of the corresponding tubing.</p> |
