| abstract |
The invention relates to a gas measurement system, comprising a coherent light source (1, 201, 301, 401), which emits a light beam; a detector (8, 208, 308, 408); a beam path (2, 202, 302) which is formed between the light source (1, 201, 301, 401) and the detector (8, 208, 308, 408); and a gas cell (4, 204, 304, 404), which is arranged in the beam path between the light source (1, 201, 301, 401) and the detector (8, 208, 308, 408), such that the detector (8, 208, 308, 408) receives the light transmitted by the gas cell (4, 204, 304, 404); wherein the gas cell (4, 204, 304, 404) comprises a porous ceramic (11, 211, 311, 411); and wherein the gas cell (4, 204, 304, 404) has an optical path length which is a multiple of the actual layer thickness of the gas cell (4, 204, 304, 404); characterised in that, furthermore, an optical element (3, 203, 303, 403) is arranged in the beam path (2, 202, 302) between the light source (1, 201, 301, 401) and the detector (4, 204, 304, 404); and that the light beam emitted by the light source (1, 201, 301, 401) is widened and unfocussed as the light beam enters the gas cell (4, 204, 304, 404). |