Gas Analysis with Laser-Based Sensors (image) DOE/Pacific Northwest National Laboratory Caption Scientists can analyze atmospheric gas concentrations with laser-based sensors that use systems similar to the one illustrated above. The sensor instrument directs a laser through gas and, based on how much laser light is absorbed by a sample, scientists can determine the specific gases present and their concentrations. Credit PNNL Usage Restrictions Credit PNNL 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.