| 摘要 |
A sensor system for detection of a gaseous chemical substance is provided, which comprises an optical sampling cell holding a sampling chamber of a volume of at most 20mm<SUP>3,</SUP> a light emitter and a light receiver. The sampling cell is adapted for free-space, single monomodal propagation of the light beam. With the sensor system, high sensitivity is obtained by elimination of interferometric noise. |
