Study On Multi-channel Time-correlated Single Photon Counting Technique

There are two methods to detect photosignal, they are analog technique and photocounting technique, but photon counting technique is better suited to record low-intensity signals, because its SNR(signal-to-noise ratio) is higher while recording low-intensity signals. Compared with photo counting technique, Time-correlated singlephoton counting (TCSPC) technique has higher sensitivity, higher time resolution andbetter stability than photon couting technique. Multi-channel TCSPC technique whichis developed from TCSPC technique has not only these characteristics, but also higherexperimental efficiency and more comprehensive information of signals.Through the study of principle of TCSPC technique, the function of itscomponents parts and progress in domestic and abroad, a TCSPC experimental systemand a multi-channel TCSPC experimental system ware set up, then they are used tomake some laser ranging experiments. Some conclusions ware found, this TCSPCexperimental system with higher SNR and accuracy was more advanced than thesystem of the past. Multi-channel TCSPC experimental system could ensure the sameexperiment conditions of each channel, this characteristic will be very important forimaging experiments.At last, a experimental system was designed to measure fluorescence lifetime ofthe dye. Two channels were used to measure fluorescence lifetime of rhodamine590inthe562nm and567.5nm wavelength. I found that multi-channel TCSPC techniquecould get a more comprehensive result of photosignal.