Underwater visible light communication can be used to measure the quality of the transmission medium not only for communication. We used three different LEDs for communication and measured the amplitude of the detected signal. The measured value can be compared to a reference point and the transmission medium caused attenuation can be calculated. There is a connection between the attenuation and the pollution of the water. We will show that the type of the water can be identify if only the attenuation is measured.

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