| 摘要 |
The present invention relates to a gas cell which is included in a gas sensor and adapted to establish the presence of a gas and/or for determining the concentration of one such gas (G), comprising a cavity ( 2' ) which is delimited by wall portions that have light reflecting properties and which is intended to enclose a volume ((G)) of said gas, and further comprising a light source ( 3 ) which is adapted to emit a light bundle ( 3 a') directed for reflection between cavity-associated and opposing wall portions, wherein a light bundle ( 3 a'') is comprised of light rays which are reflected in a concave wall mirror surface ( 2 b') and adapted to be directed onto one or more light receivers ( 4, 5 ) which function to detect an absorption wavelength corresponding to the gas sample ((G)). The concave curved wall mirror surface ( 2 b') is adapted to reflect an obliquely received divergent light bundle ( 3 a') from the light source ( 3 ) onto a flat grating-allocated cavity-associated wall surface ( 2 g') whose reflecting surface includes or is structured as a Littrow arrangement ( 2 g''). The light bundle ( 3 a'') is adapted to fall onto the flat wall surface ( 2 g') at an angle which lies close to the Blaze angle of the grating wherewith, inter alia, an absorption wavelength corresponding to the chosen gas sample ((G)) and present in the light bundle ( 3 a'') is caused to be reflected and diffracted (( 3 a'')) by said flat wall surface ( 2 g'') in a straight opposite direction so as to be reflected again in said curved mirror surface ( 2 b') and directed diffracted towards each of said light receivers ( 4, 5 ).
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