KONTROLL AV MAGNETISKT GENOMSLAEPPLIGA PARTIKLAR I ETT BAERARMATERIAL.

摘要

Monitoring the quantity of magnetically permeable particles dispersed within a carrier of a composite material by energizing an inductor coil (28) which surrounds the material and then producing a signal corresponding to inductance of the coil. The inductance is influenced by the quantity of permeable particles in the carrier and within the coil and hence the signal is a measure of this quantity and is usable in a method of controlling the particles. In this control, the signal is evaluated and if it differs from that representing a desired quantity of particles, a control means is operated to adjust input of particles or carrier into the composite material. The composite material may be in fluid state and is passed through the coil and within a dielectric vessel (30, 58). Alternatively, the material is a dry dielectric layer provided upon a conductor (14) which is passed through the coil.