| 摘要 |
<p>A robust gas sensor can be manufactured in a simple manner and at low cost, and have no movable optical components. A measured gas cell ( 3 ) has a wall defining a cylindrical space with a measured gas inlet. The measured gas cell ( 3 ) is limited in the longitudinal axial direction by a reflective, flat first cover element ( 1 ) and by a reflective, flat second cover element ( 5 ) arranged at a spaced location from and in parallel to the first cover element ( 1 ). The height of the measured gas cell ( 3 ) corresponds approximately to 1 to 3 times the diameter of the cover elements ( 1, 5 ). The second cover element ( 5 ) accommodates a radiation source ( 6 ) and two detector elements ( 23, 24 ) with at least one measuring detector and one reference detector. The radiation source ( 6 ) is arranged displaced by 30% to 60% of the radius of the second cover element ( 5 ) from the center of the second cover element ( 5 ). Both detector elements ( 23, 24 ) are displaced by an amount of 25% to 35% of the radius of the second cover element ( 5 ), which amount is equal for both detector elements ( 23, 24 ), from a straight line passing through the center of the second cover element ( 5 ), wherein the straight line extends at right angles to the diameter of the radiation source ( 6 ), and the direction of displacement of the detector elements ( 23, 24 ) is opposite that of the radiation source ( 6 ). The detector elements ( 23, 24 ) are arranged mirror symmetrically to each other and at equal distance from the diameter of the radiation source ( 6 ), wherein the distance amounts to 10% to 50% of the radius of the second cover element ( 5 ).</p> |
