Schematic Illustration of Technique (IMAGE) Optica Caption This is a schematic illustration of the technique used to detect contaminants. A laser beam is directed perpendicularly into the flow of water. Fluorescent light from contaminants in the water is carried away to be detected and analyzed. Credit Gianluca Persichetti, IREA – CNR Usage Restrictions Must include caption & credit License Licensed content 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.