| 摘要 |
An apparatus for detecting pollution of the liquid contained in a container having transparent walls. Means are provided for causing the liquid to move relative to the stationary container. A zone of the liquid is illuminated and imaged on a component including at least one optical grating and at least one photoelectric receiver behind the grating in the direction of light flux; the receiver being responsive to light received from each grating. An electrical evaluation means is connected to the receivers for comparing the electrical signals derived from the respective photoelectric receivers, thereby generating a signal which is indicative of the presence of pollutant particles in the liquid.
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