Monitoring Food with Millimeter Waves (image) Fraunhofer-Gesellschaft Caption The millimeter-wave sensor can look through all non-transparent, non-metallic materials. Credit Fraunhofer FHR Usage Restrictions The picture may be used for editorial purposes only. It is protected by copyright. The use is free of charge if the reference is mentioned. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.