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For a fast analysis of the fluorescence signal detected by the SiPM, we developed an ASIC for fluorescence histogram recording. The ASIC determines the time between excitation pulse and incoming fluorescence photon with an accuracy of about 80 ps. The ASIC blind time after the excitation pulse is configurable. The determined time is saved in bins. The width of the bins is programmable. Output of the ASIC is a histogram with the counted amount of photons at the different times after excitation. This histogram equals the fluorescence response of the dye. The fluorescence lifetime can be calculated out of this histogram. |
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