Detonation at NPL (IMAGE) National Physical Laboratory Caption The detonation of a small pyrotechnic charge in the NPL facility. A radiation pyrometer on the left side of the image observes the event. Credit NPL Usage Restrictions None 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.