ULTRA-HIGH FREQUENCY CAVITY SUITABLE FOR THE MEASUREMENT OF ELECTROMAGNETIC CHARACTERISTICS OF A MOVING FILIFORM MATERIAL

摘要

In order to measure the electromagnetic characteristics of a moving filiform material without cutting the latter and without any risk of a liquid and/or solid pollution introduced by the material disturbing the measurements, an ultra-high frequency cavity (10) is proposed, whose wall (12) is traversed by two facing orifices, in which are placed the two open parts of a dismantlable tubular protective device (26). The slot (24) makes it possible to introduce the filiform material (F) in to the cavity. The device (26) isolates the filiform material from the latter and its production in two parts enables it to be put into place without cutting the material. The protective device (26) is replaced without stopping the measurements and without any pollution being able to enter the cavity.