Pollution monitoring equipment. Technician operating a pump and probe LIDAR (Light Detection and Ranging) apparatus to measure air pollution levels. This equipment fires two laser beams (at left) into the sky. The first beam generates a strong concentration of hydroxyl radicals at a given point in the atmosphere. The second beam measures how long these highly reactive radicals survive. Hydroxyl radicals will be quickly destroyed by the large hydrocarbons found in a polluted atmosphere. Hence,if the radicals have a short lifetime,this indicates a highly polluted atmosphere. Photographed at Lausanne Polytechnic (EPFL),Switzerland | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Goetgheluck, Pascal |
Taille de l’image : | 3529 px × 5036 px |
Model Release : | Le droit n'est pas encore disponible. Merci de nous contacter avant utilisation. |
Property Release : | Non requis |
Restrictions : | - |