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

es. A conveyor belt transports the sample perhaps a package whose contents are unknown between the antennae, while these send electromagnetic waves in a high frequency of 78 GHz. Different areas of the sample absorb the signal to different degrees, leading the varying material composition across a sample to show up in distinguishable contrast. "Basically we examine the scanned objects for dissimilarities," explains Essen. The content of the sample appears in real time on the scanner's fold-out display. If the package contains a knife, even the grain of the handle is discernible. If the handle is hollow, the millimeter-wave sensor would show that, too. The device scans an area of 30 x 30 centimeters in just 60 seconds.

Our system can be operated without safety precautions or safety instructions, and since it weighs just 20 kilograms it's eminently portable. It can also be adjusted to various measuring frequencies," the scientist points out. In future, the researchers aim to "upgrade" the system for terahertz frequencies of 2 THz. "Then we'll be in a position not just to detect different structures but also to establish which type of plastic a product is made from. That's not possible at the moment," says Dr. Essen.

At present, SAMMI is only suitable for spot checks. However, the FHR researchers are working on adapting the millimeter-wave sensor for industrial assembly lines for the fast, automatic inspection of goods. They envision mounting a line of sensors over the conveyor belt, so that in future products can be scanned at a speed of up to six meters per second.


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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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