| 摘要 |
<p>A surface-ionization detector for gas mixture analysis comprises a casing (1), in which is mounted perpendicularly to the gas mixture flow a thermoemitter consisting of mutually electrically insulated elongate ionizing elements, for example two parallel metal wires (9), each of them being connected to its own current conductor (11) for independently controlling the heating power of each wire (9). The gas mixture components to be analyzed, the molecules of which are ionized due to the surface ionization, are ionized on the surface of the metal wires (9), are desorbed from said surface and, under the influence of a potential difference of a few volts between the thermoemitter and an ion collector (8) move towards the ion collector mounted downstream of the thermoemitter and consisting of a perforated element, for example a metallic grid (13). The molecules of the gas mixture flow promote the effective movement of ions from the thermoemitter to the ion collector (8) due to their orientation perpendicular to the gas mixture flow in the casing (1).</p> |
