SiPM (solid-state silicon photomultiplier) -enabled portable delayed fluorescence photon counting device (IMAGE) York University Caption This SiPM (solid-state silicon photomultiplier) -enabled portable delayed fluorescence photon counting device counts light particles emitted from plants following a flash of light to gauge their health. Credit York University Usage Restrictions None License Original 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.