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Monitoring food with millimeter waves
Date:12/21/2011

Has the packet been properly filled? Are there impurities in the chocolate? Have the plastic seams been welded correctly? Is there a knife hidden in the parcel? Answers to all these questions are provided by SAMMI, short for Stand Alone MilliMeter wave Imager. The millimeter-wave sensor is able to see through all non-transparent materials. Researchers at the Fraunhofer Institute for High Frequency Physics and Radar Techniques FHR in Wachtberg have developed the device, whichat 50 centimeters wide and 32 centimeters high is no larger than a compact laser printer. SAMMI can happily deal with all non-metallic materials. "The system detects wooden splinters lurking in diapers, air pockets in plastic, breaks in bars of marzipan, and foreign bodies in foodstuffs. It can even detect and monitor the dehydration process in plants and how severely they have been stressed by drought," says Dr. Helmut Essen, head of the FHR's millimeter-wave radar and high-frequency sensors department. This makes the scanner extremely versatile it's just as suitable for industrial product and quality control as for analyzing materials in the laboratory. Because the system can detect dangerous substances such as explosive powder hidden in letters, vulnerable people such as politicians or freight handlers can be protected by millimeter-wave radar.

SAMMI's most striking feature is its ability to pick out the smallest differences in materials differences that are invisible to x-rays. SAMMI can for example differentiate between the different fillings of chocolates, or between rubber composites that have similar or identical absorption qualities. Another advantage is that the scanner doesn't employ ionizing radiation, which can damage health. It is also low-maintenance, not requiring the regular checks necessary with x-ray tubes.

But how does SAMMI work? Inside the system's housing, there is both a transmitting and a receiving antenna on each of two opposing rotating plat
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Contact: Dr. Helmut Essen
helmut.essen@fhr.fraunhofer.de
49-228-943-5249
Fraunhofer-Gesellschaft
Source:Eurekalert  

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