Abstract: 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.

Abstract: A device and method for the determination of the dielectric characteristics of a material sample. The device includes a probe (3) connected to a coaxial line (2) by a connector (30). The probe comprises a conductive tubular member (78) having a conductive rod (8) coaxial to the tubular member and centered on the latter. An annular member is made of a dielectric material is housed in the tubular member, and is integral with the rod. The annular member/rod assembly is slidably carried in the tubular part (7). A resistive force urges the probe in contact with the material sample (4) so that good contact is ensured with the material sample.