GAS CELL ADAPTED FOR MEASURING CARBON DIOXIDE

摘要

The invention relates to a gas cell ( 1 ) adapted for carbon dioxide and including a cavity ( 10 ) which is adapted for a chosen gas volume, a light s source ( 11 ) and a light-bundle receiving unit ( 12 ). The light source ( 11 ) is placed in a focal point (F) associated with a partially elliptical mirror surface ( 13 ) forming a reflector for the light source ( 11 ) and a first defining surface of the cavity ( 10 ). Two other cavity-defining surfaces are comprised of gas-conducting surfaces ( 14 a , 14 b) orientated from the end-parts ( 13 a ', 13 b') of the mirror surfaces ( 13 a , 13 b). The light-bundle receiving unit ( 12 ) is placed in a second focal point (F') associated with the partially elliptical mirror surfaces ( 13 a , 13 b).