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Patent

Abstract 

A detector (500, 600, 900, 1200) for detecting fluorescence lifetime comprises a single-photon detection circuit (150) for generating digital pulses upon detection of photons a pulse-inhibit circuit (165, 166) for rejecting detected photons that occur outside a measurement window and a switched-capacitor circuit (160) for computing, based on the center of mass principle and an exponential moving average function, an average voltage dependent on the fluorescence lifetime determined by the detected and not rejected photons, wherein the switched-capacitor circuit has an output node (172) for outputting the computed average voltage as a measure of the fluorescence lifetime.

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