| 摘要 |
System for detecting the forming of depot inside a transport channel for transporting particles in a light transparent carrier fluid, comprising a light transmitter, a light receiver, a bifurcated glass fibre cable of which an end is installed in the wall of a transport channel. One branch of the cable is coupled to the light transmitter and the other branch is coupled to the light receiver, and the output of the light receiver is connected to a discriminator circuit comprising a converter for converting the effective ac voltage component in the received signal into a dc voltage component and a comparator in which the dc voltage signal is compared with a predetermined threshold signal, which discriminator circuit is coupled to a visual indicator unit. |
