Macrowave cavity for measuring electromagnetic characteristics of a moving fifliform material.

摘要

The apparatus is intended to measure the electromagnetic properties of a longitudinally moving filamentary material without cutting it and without running the risk of spoiling the measurements by any liquid and/or solid pollution introduced by the material. The apparatus consists of a microwave cavity (10) whose opposite walls (12) are pierced by two apertures into which are inserted the two open parts of a detachable tubular protective device (26). The slit (24) enables the filamentary material (F) to be introduced into the cavity. The device (26) isolates the filamentary material from the cavity and, because it is produced in two parts, it can be installed without cutting the said material. The protective device (26) may be replaced without stopping the measurements and without the possibility of any pollution entering the cavity.
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