| 摘要 |
The invention relates to a gas cell ( 2 ') that includes a cavity ( 20 ) for a chosen gas volume, a light source ( 30 ), and one or more light bundle receiving units or detectors ( 21, 22, 23, 24, 25 ). The cavity ( 20 ) is formed by and delimited by, inter alia, a first partially elliptical mirror surface ( 20 a) and two partially elliptical mirror surfaces, a second ( 20 b) and a third ( 20 c), which are opposed to said first mirror surface ( 20 a) and which are so orientated in relation to each other that a light bundle ( 130 a , 130 b) will be reflected by said mirror surfaces ( 20 a , 20 b , 20 c) so as to form an optical measurement path extremity, and terminate in a light-receiving unit ( 21, 22, 23, 24, 25 ) allocated to a chosen measurement path extremity. The light source ( 30 ) is disposed in one end region of said cavity ( 20 ) and a reflector ( 30 a , 30 b) which functions to cause emitted light bundles to converge towards a focusing point (F) is also disposed in said one end region. |
