| 摘要 |
<p>A detector unit (1) with several detector chambers (2), an observation chamber (5) and a common chamber (7). A pair of light sources (9) and a detector (10) are in the detector chambers (2). A pair of light sources (9.2) and a sensor (9.1) are in the common chamber (7). An air flow detector (14) is in each separate detector chamber (2) having a long arm (12). A showing arm (12) is in the visual observation chamber (5).</p> |
