Yes, the UVS-AB has two independent detection systems. The UVS-AB has two continuous, simultaneous, analog outputs; one for UV-A and one for UV-B. See below drawing of the UVS-AB for details. Beneath the dome and diffuser two sets of filters and detectors are positioned. Detector 1 is 4 times bigger than detector 2. Detector 2 is located exactly in the middle, on top of detector 1. Filter 1 has an opening in the middle for filter 2 plus detector 2. In this way we can make sure both detectors have a 180 degree field of view.