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EMG strip guiding systems: Know-how for the users - 06

Radar-based strip centre measurement in the furnace with EMG-Vivaldi®

In this and the following articles of this series we summarize know-how on the use of EMG strip guiding systems and try to provide you with the necessary basis for the planning of the applicable components and for the design of the systems.

Published so far:

Radar-based strip centre measurement in the furnace with EMG-Vivaldi® 

Use and application:
A particular challenge is the measurement of strip position in extreme environments, such as in continuous annealing furnaces. EMG has many years of experience with the IMH inductive strip centre measuring systems in furnaces with temperature ranges up to 1100 °C.

Irrespective of this, there is often the desire to be able to determine the strip centre position in the furnace without active or interfering sensor elements or other assemblies installed within the furnace atmosphere.

Functional principle:
The EMG Vivaldi® sensor is located outside the furnace and performs measurement through the pressure-tight closed furnace wall (see schematic view). The sensor system mounted on the outside of the furnace wall focuses electromagnetic waves on the edge of thin metal strips through the non-conductive insulation of the furnace. The measuring accuracy is +1 mm.

Special characteristics:
As the furnace wall is completely closed and no sensor element protrudes into the interior of the furnace, an unplanned strip break cannot damage the sensor - additional strip deflectors in the furnace are therefore not required. The electronics as well as the antennas on the outer furnace wall can be cooled with water if necessary. The pressure-tight installation of the radar windows is carried out with a particularly high-quality thermal heat insulation in the furnace wall. An additional advantage is that the actual sensor can be removed from the furnace if necessary without having to open the furnace, i.e. the furnace wall always remains pressure-tight after the initial installation. 

The system is put into operation by means of simple reference measurement and calibration. EMG uses specially developed software tools to set up the measurement equipment. 

The EMG Vivaldi® technology can very well replace other systems. EMG also offers special conversion kits for the IMH sensor solutions.

In summary - Which EMG components do I need?
The essential components are:

And not to be forgotten, of course, know-how in the design, construction and installation of the overall solution for installation in the furnace. You will find all this at EMG!

What is the next step?
Our sales and service staff, our international sales organization or our product manager Martin Wied ( can offer you concrete advice on the design of your control system at any time.


Video: EMG-Vivaldi® - Radar-based strip centre measurement in high temperature ranges

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