| 摘要 |
The compensating method involves using a second light transmitter(LS2) is provided, which with the existing light receiver(LE) detects a moisture coating on the receiver optic(EL). Whilst periodically the smoke density(MWR) is measured with t he first light transmitter(LS1), and at times alternates with the humidity(MWF) measured with the first light transmitter(LS2). The two measurement values are processed. The second light transmitter is arranged in the direct vicinity of the light receiver(LE) or its receiver optic(EL), such that the transmitted light brushes the receiver optic(EL) approximately tangentially, and the moisture coating(WT) reflects the light of the second light transmitter. So that the receiver output signal weakens, depending on the thickness of the moisture coating. |
