Fagus-GreCon Greten GmbH - Ultrasound Camera
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 Ultrasound Camera in Wood Materials
Industry
Automatic measurement systems are used for quality assurance in the
wood materials industry. GreCon developed an ultrasound camera that is
used to inspect the glue-spread quality of chipboard. The quality of
glue spread is dependent on different process parameters such as the
pressure factor, water content of the material, age of the glue. In
order to ensure uniform conditions for qualitatively high-quality
measurements, continuous automatic calibration and contamination
inspection is carried out on the ultrasound camera. Reliability and
operational safety is enhanced by this self-inspection. The system thus
provides important information for optimizing the production process in
terms of quality and production flow. The measurement system is modular
in its construction. Up to 48 ultrasound cameras are installed,
depending on the width of the board. Each ultrasound camera provides
analog and digital measurement data to a micro-controller module. These
are in turn connected over a CAN-bus to a master assembly. The master
assembly transfers the collected and pre-processed data to a PC-based
visualization and diagnostics system. A rapid data acquisition system
was developed because of the high production speed of up to 4 m/s.
Acquisition and processing of the analog measurement data is done at a
speed of up to 500kS/s. This task is done by a high-performance FPGA,
which is controlled by a micro-controller.The development of the
micro-controller assembly was done at SYS TEC. The hardware was subject
to stringent requirements of fault-free operation and minimization of
material costs. SYS TEC carried out studies on fault-free operation in
the presence of electrostatic discharge and line-associated
interference that went beyond standard requirements. The findings were
incorporated into the hardware design. SYS TEC developed the basic
software for controlling the FPGA for the assembly. A PC-based system
was implemented for start-up and diagnosis, which communicates with the
hardware via CAN with CANopen and via RS-232.
Serial Production
Production of the assemblies from both projects is done at SYS TEC in
quantities greater than 1,000 per year. In compliance with GreCon
quality requirements, test equipment was developed and optimized at SYS
TEC, which checks the complete functionality in the predefined
parameter limits. In the context of quality assurance, all test values
are recorded and can be traced by GreCon anytime.
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