24/06/2005 - Controller General of Patents, Designs, and Trade Marks

(57) Abstract: The invention relates to a microwave measuring device for detecting the charge of a twophase
flow with a gaseous carrier medium containing small and minuscule solid and /or fluid particles and
for detecting gas contained in a fluid flow, preferably by means of waveguide carrier waves. A preferred
application of the invention is the detection of solid particles contained in the flow of gas of voluminous
pneumatic solid matter transport systems used, for example, for pulverized coal furnaces of coal power
stations. The inventive microwave measuring device is provided with field rods, which protrude into the
inside of the feed pipe, are arranged before and after a measuring section formed by a transmission antenna
and a reception antenna, said rods interacting with the feed pipe made of conductive material as a resonator
for microwaves injected into the feed pipe via the transmission antenna, whereby microwaves that differ
from the injected microwaves in their plane of polarization and/or phase as a result of diffraction,
superposition, and/or reflection outside the measuring section are essentially short-circuited in order to
prevent the results of the measurement from being distorted. The inventive device has the particular
advantage of being simple to build and easy to install even in voluminous and branched feed pipe systems.
Total Pages: 14.
(FIG.- 1.)
The Patent Office Journal 24.06.2005 17924