Cavity resonator system

摘要

A cavity resonator system for measuring EM properties of the contents of a pipe portion comprises a primary resonator and a secondary resonator each with the same configuration comprising a conductive casing that defines a cavity and has openings for receiving a pipe portion, insulator material disposed inside the cavity, and antennae for generating and detecting a resonant EM field inside the cavity. In addition, the secondary resonator comprises at least one conductive screening ring that extends around the location occupied by a pipe portion for screening the interior of the ring from the field generated inside the cavity of the secondary resonator. By combining measures of parameters of the field from both resonators, the system may be used to generate a measure representative of EM properties of the contents of the pipe portion that is compensated for variation in the EM properties of the insulator material.

主权项

1. A cavity resonator system for measuring electro-magnetic properties of the contents of a pipe portion, comprising
a primary resonator and a secondary resonator each comprising, in the same configuration: a conductive casing defining a cavity; insulator material disposed inside the cavity, the casing having a pair of opposed openings for receiving a pipe portion in a configuration extending through the cavity inside the insulator material; and antennae for generating and detecting a resonant electro-magnetic field inside the cavity, the secondary resonator further comprising at least one conductive screening ring that extends around the location to be occupied by a pipe portion received in the openings for screening the interior of the screening ring from a resonant electro-magnetic field generated inside the cavity by an antenna of the secondary resonator.